Mating Systems in Birds II: Factors Affecting Choice JodyLee Estrada Duek, Ph.D. With assistance...
32
Mating Systems in Birds II: Factors Affecting Choice JodyLee Estrada Duek, Ph.D. With assistance from Dr. Gary Ritchison How he moves King bird of paradise How he looks Wilson’s bird of paradise How he sounds Wilson’s warbler How he builds Weaver bird
Transcript of Mating Systems in Birds II: Factors Affecting Choice JodyLee Estrada Duek, Ph.D. With assistance...
Mating Systems in Birds II Factors Affecting Choice
JodyLee Estrada Duek PhDWith assistance from Dr Gary Ritchison
bull httppeopleekueduritchisongmatingsystemshtml
How he movesKing bird of paradise
How he looksWilsonrsquos bird of paradise
How he soundsWilsonrsquos warblerHow he builds
Weaver bird
Decision making and mates
bull How does a female choose (or a male in polyandrous situations)
(Bower bird video Attenborough httppeopleekueduritchisongmatingsystemshtml
about 20 down page) or useNatures Master Builder - video powered by Metacafe
Satin bower bird with robotic female fembot
Attraction Structural
Vogelkop Bowerbird Amblyornis inornatus
Major Histocompatibility Complex MHC
bull The major histocompatibility complex (MHC) is a large genomic region found in most vertebrates
bull most gene-dense region of the mammalian genome important role in the immune system autoimmunity and reproductive success
bull The proteins encoded by the MHC expressed on the surface of cells in all jawed vertebrates and display both self antigens (peptide fragments from the cell itself) and nonself antigens (eg fragments of invading microorganisms) to a type of white blood cell called a T cell that has the capacity to kill or co-ordinate the killing of pathogens infected or malfunctioning cells
bull Helps the body recognize itself and target nonself invadersbull Genetically advantageous to outcross for variability in MHC genomebull T-shirt study by Wedekind et al 1995
MHC-dependent mate preferences in humansbull One substantial benefit of sexual reproduction could be that it allows animals to
react to a continuously changing environmental selection pressure such as coevolving parasites
bull This would be most efficient if females able to provide their progeny with allele combinations for loci crucial in the parasite-host arms race eg MHC
bull MHC influences both body odours and body odour preferences in humans and that the womens preferences depend on their hormonal status
bull Female and male students were typed for their HLA-A -B and -DR ndash Each male student wore a T-shirt for two consecutive nights ndash The next day each female student was asked to rate the odours of six T-shirts ndash They scored male body odours as more pleasant when they differed from the men in their MHC
than when they were more similar ndash This difference in odour assessment was reversed when the women rating the odours were taking
oral contraceptives ndash Furthermore the odours of MHC-dissimilar men remind the test women more often of their own
actual or former mates than do the odours of MHC-similar men ndash This suggests that the MHC or linked genes influence human mate choice today
bull Proc Biol Sci 1995 Jun 22260(1359)245-9 Wedekind C Seebeck T Bettens F Paepke AJ PMID 7630893 [PubMed - indexed for MEDLINE]
bullThe ideal weaver bird nestbull large opening bullflattened at the bottombull well attached to a branch
Attraction Structural
The weaver bird sagahellip you attract her with a fine nesthellip
Weaver birds Dikololo Preserve S Africa
Weberrsquos law
bull the ability of an individual to discriminate a difference between stimuli decreases with the size or intensity of those stimuli
bull if females choose mates based in part on tail length its more difficult for females to distinguish between males that differ slightly in tail length as the length of tails (over evolutionary time) increases
Blue bird of paradise
bull Blue Bird of Paradise Paradisaea rudolphi The Strangest Bird Sounds - video powered by Metacafe
Attraction Sounds
Peak shiftbull if a female acquires a preference (egby
imprinting on some characteristic or characteristics of her father) then later in life she may exhibit a preference for males that exhibit an enhanced version of that (or those) characteristic(s)
Lesser bird of paradise
Attraction sounds amp displays
bull Courtship display of Clarks Grebeshttppeopleekueduritchisongmatingsystemshtml about 25 down bull
Best-of-n
bull females samples a certain number of males (eg perhaps a migrant female arrives in a breeding area and visits five males and territories) then chooses as her mate the best of those sampled males
Attraction sounds amp displays
bull Andean cock-of-the-rock (Rupicola peruviana)httppeopleekueduritchisongmatingsystemshtml about 20 down
Threshold
bull a female may have a standard in terms of mate quality and chooses as her mate the first male that meets or exceeds that standard
Attraction Sounds amp Displays
bull Superb Bird of Paradise httpwwwyoutubecomwatchv=bOl54VFT1cA
Female Choicebull The flow of information is from the male to the
behavioral output of the female bull The assumption is that male quality translates into his
traits ndash visual auditory behavioral (and other) ndash cues for the female
bull Her choice is based on her ability to perceive trait(s) of the male and then use that information to decide
bull The information from one male will be compared to other males affected by the femalersquosbull cognitive abilitiesbull memorybull ability to process information from multiple sources
simultaneously (Bateson and Healy 2005)
Attraction Sounds amp Displays
bull Satin Bowerbird httpwwwyoutubecomwatchv=Ii2D9Bd5OoE
Mechanisms of mate choice evolution1 Direct phenotypic effectsbull Female preference for a male ornament can evolve as a result of
direct phenotypic benefits if the ornament reflectsndash the ability of the male to provide material advantagesndash a high-quality territory nutrition parental care or protection ndash There is considerable empirical support for this mechanism
Mechanisms of mate choice evolution2 Sensory bias bull Female preference favouring a male ornament can initially
evolve under natural selection for other reasons bull Eg context of foraging or predator avoidance bull Males evolving traits that exploit this bias then become
favoured by mate choice bull There is increasing phenotypic evidence that some male
ornaments initially evolved through female sensory biases but the evolution of female sensory bias itself requires more testing
Attraction dance
bull Note the changing postures of the female Cape Gannet httpwwwyoutubecomwatchv=BhobLcMgfkE
bull Chilean Flamingos (Phoenicopterus chilensis) httpwwwyoutubecomwatchv=CUb0evFZbNM
Mechanisms of mate choice evolution3 Fisherian sexy sons bull If there are genetic components to variance in female
preference and male trait a female choosing a male with a large trait bears daughters and sons thatndash both carry alleles for a large traitndash and alleles for the preference for it
bull This genetic coupling might lead to self-reinforcing coevolution between trait and preference
bull Direct critical testing of this mechanism is difficult but molecular genetics offers new possibilities
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
Decision making and mates
bull How does a female choose (or a male in polyandrous situations)
(Bower bird video Attenborough httppeopleekueduritchisongmatingsystemshtml
about 20 down page) or useNatures Master Builder - video powered by Metacafe
Satin bower bird with robotic female fembot
Attraction Structural
Vogelkop Bowerbird Amblyornis inornatus
Major Histocompatibility Complex MHC
bull The major histocompatibility complex (MHC) is a large genomic region found in most vertebrates
bull most gene-dense region of the mammalian genome important role in the immune system autoimmunity and reproductive success
bull The proteins encoded by the MHC expressed on the surface of cells in all jawed vertebrates and display both self antigens (peptide fragments from the cell itself) and nonself antigens (eg fragments of invading microorganisms) to a type of white blood cell called a T cell that has the capacity to kill or co-ordinate the killing of pathogens infected or malfunctioning cells
bull Helps the body recognize itself and target nonself invadersbull Genetically advantageous to outcross for variability in MHC genomebull T-shirt study by Wedekind et al 1995
MHC-dependent mate preferences in humansbull One substantial benefit of sexual reproduction could be that it allows animals to
react to a continuously changing environmental selection pressure such as coevolving parasites
bull This would be most efficient if females able to provide their progeny with allele combinations for loci crucial in the parasite-host arms race eg MHC
bull MHC influences both body odours and body odour preferences in humans and that the womens preferences depend on their hormonal status
bull Female and male students were typed for their HLA-A -B and -DR ndash Each male student wore a T-shirt for two consecutive nights ndash The next day each female student was asked to rate the odours of six T-shirts ndash They scored male body odours as more pleasant when they differed from the men in their MHC
than when they were more similar ndash This difference in odour assessment was reversed when the women rating the odours were taking
oral contraceptives ndash Furthermore the odours of MHC-dissimilar men remind the test women more often of their own
actual or former mates than do the odours of MHC-similar men ndash This suggests that the MHC or linked genes influence human mate choice today
bull Proc Biol Sci 1995 Jun 22260(1359)245-9 Wedekind C Seebeck T Bettens F Paepke AJ PMID 7630893 [PubMed - indexed for MEDLINE]
bullThe ideal weaver bird nestbull large opening bullflattened at the bottombull well attached to a branch
Attraction Structural
The weaver bird sagahellip you attract her with a fine nesthellip
Weaver birds Dikololo Preserve S Africa
Weberrsquos law
bull the ability of an individual to discriminate a difference between stimuli decreases with the size or intensity of those stimuli
bull if females choose mates based in part on tail length its more difficult for females to distinguish between males that differ slightly in tail length as the length of tails (over evolutionary time) increases
Blue bird of paradise
bull Blue Bird of Paradise Paradisaea rudolphi The Strangest Bird Sounds - video powered by Metacafe
Attraction Sounds
Peak shiftbull if a female acquires a preference (egby
imprinting on some characteristic or characteristics of her father) then later in life she may exhibit a preference for males that exhibit an enhanced version of that (or those) characteristic(s)
Lesser bird of paradise
Attraction sounds amp displays
bull Courtship display of Clarks Grebeshttppeopleekueduritchisongmatingsystemshtml about 25 down bull
Best-of-n
bull females samples a certain number of males (eg perhaps a migrant female arrives in a breeding area and visits five males and territories) then chooses as her mate the best of those sampled males
Attraction sounds amp displays
bull Andean cock-of-the-rock (Rupicola peruviana)httppeopleekueduritchisongmatingsystemshtml about 20 down
Threshold
bull a female may have a standard in terms of mate quality and chooses as her mate the first male that meets or exceeds that standard
Attraction Sounds amp Displays
bull Superb Bird of Paradise httpwwwyoutubecomwatchv=bOl54VFT1cA
Female Choicebull The flow of information is from the male to the
behavioral output of the female bull The assumption is that male quality translates into his
traits ndash visual auditory behavioral (and other) ndash cues for the female
bull Her choice is based on her ability to perceive trait(s) of the male and then use that information to decide
bull The information from one male will be compared to other males affected by the femalersquosbull cognitive abilitiesbull memorybull ability to process information from multiple sources
simultaneously (Bateson and Healy 2005)
Attraction Sounds amp Displays
bull Satin Bowerbird httpwwwyoutubecomwatchv=Ii2D9Bd5OoE
Mechanisms of mate choice evolution1 Direct phenotypic effectsbull Female preference for a male ornament can evolve as a result of
direct phenotypic benefits if the ornament reflectsndash the ability of the male to provide material advantagesndash a high-quality territory nutrition parental care or protection ndash There is considerable empirical support for this mechanism
Mechanisms of mate choice evolution2 Sensory bias bull Female preference favouring a male ornament can initially
evolve under natural selection for other reasons bull Eg context of foraging or predator avoidance bull Males evolving traits that exploit this bias then become
favoured by mate choice bull There is increasing phenotypic evidence that some male
ornaments initially evolved through female sensory biases but the evolution of female sensory bias itself requires more testing
Attraction dance
bull Note the changing postures of the female Cape Gannet httpwwwyoutubecomwatchv=BhobLcMgfkE
bull Chilean Flamingos (Phoenicopterus chilensis) httpwwwyoutubecomwatchv=CUb0evFZbNM
Mechanisms of mate choice evolution3 Fisherian sexy sons bull If there are genetic components to variance in female
preference and male trait a female choosing a male with a large trait bears daughters and sons thatndash both carry alleles for a large traitndash and alleles for the preference for it
bull This genetic coupling might lead to self-reinforcing coevolution between trait and preference
bull Direct critical testing of this mechanism is difficult but molecular genetics offers new possibilities
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
Vogelkop Bowerbird Amblyornis inornatus
Major Histocompatibility Complex MHC
bull The major histocompatibility complex (MHC) is a large genomic region found in most vertebrates
bull most gene-dense region of the mammalian genome important role in the immune system autoimmunity and reproductive success
bull The proteins encoded by the MHC expressed on the surface of cells in all jawed vertebrates and display both self antigens (peptide fragments from the cell itself) and nonself antigens (eg fragments of invading microorganisms) to a type of white blood cell called a T cell that has the capacity to kill or co-ordinate the killing of pathogens infected or malfunctioning cells
bull Helps the body recognize itself and target nonself invadersbull Genetically advantageous to outcross for variability in MHC genomebull T-shirt study by Wedekind et al 1995
MHC-dependent mate preferences in humansbull One substantial benefit of sexual reproduction could be that it allows animals to
react to a continuously changing environmental selection pressure such as coevolving parasites
bull This would be most efficient if females able to provide their progeny with allele combinations for loci crucial in the parasite-host arms race eg MHC
bull MHC influences both body odours and body odour preferences in humans and that the womens preferences depend on their hormonal status
bull Female and male students were typed for their HLA-A -B and -DR ndash Each male student wore a T-shirt for two consecutive nights ndash The next day each female student was asked to rate the odours of six T-shirts ndash They scored male body odours as more pleasant when they differed from the men in their MHC
than when they were more similar ndash This difference in odour assessment was reversed when the women rating the odours were taking
oral contraceptives ndash Furthermore the odours of MHC-dissimilar men remind the test women more often of their own
actual or former mates than do the odours of MHC-similar men ndash This suggests that the MHC or linked genes influence human mate choice today
bull Proc Biol Sci 1995 Jun 22260(1359)245-9 Wedekind C Seebeck T Bettens F Paepke AJ PMID 7630893 [PubMed - indexed for MEDLINE]
bullThe ideal weaver bird nestbull large opening bullflattened at the bottombull well attached to a branch
Attraction Structural
The weaver bird sagahellip you attract her with a fine nesthellip
Weaver birds Dikololo Preserve S Africa
Weberrsquos law
bull the ability of an individual to discriminate a difference between stimuli decreases with the size or intensity of those stimuli
bull if females choose mates based in part on tail length its more difficult for females to distinguish between males that differ slightly in tail length as the length of tails (over evolutionary time) increases
Blue bird of paradise
bull Blue Bird of Paradise Paradisaea rudolphi The Strangest Bird Sounds - video powered by Metacafe
Attraction Sounds
Peak shiftbull if a female acquires a preference (egby
imprinting on some characteristic or characteristics of her father) then later in life she may exhibit a preference for males that exhibit an enhanced version of that (or those) characteristic(s)
Lesser bird of paradise
Attraction sounds amp displays
bull Courtship display of Clarks Grebeshttppeopleekueduritchisongmatingsystemshtml about 25 down bull
Best-of-n
bull females samples a certain number of males (eg perhaps a migrant female arrives in a breeding area and visits five males and territories) then chooses as her mate the best of those sampled males
Attraction sounds amp displays
bull Andean cock-of-the-rock (Rupicola peruviana)httppeopleekueduritchisongmatingsystemshtml about 20 down
Threshold
bull a female may have a standard in terms of mate quality and chooses as her mate the first male that meets or exceeds that standard
Attraction Sounds amp Displays
bull Superb Bird of Paradise httpwwwyoutubecomwatchv=bOl54VFT1cA
Female Choicebull The flow of information is from the male to the
behavioral output of the female bull The assumption is that male quality translates into his
traits ndash visual auditory behavioral (and other) ndash cues for the female
bull Her choice is based on her ability to perceive trait(s) of the male and then use that information to decide
bull The information from one male will be compared to other males affected by the femalersquosbull cognitive abilitiesbull memorybull ability to process information from multiple sources
simultaneously (Bateson and Healy 2005)
Attraction Sounds amp Displays
bull Satin Bowerbird httpwwwyoutubecomwatchv=Ii2D9Bd5OoE
Mechanisms of mate choice evolution1 Direct phenotypic effectsbull Female preference for a male ornament can evolve as a result of
direct phenotypic benefits if the ornament reflectsndash the ability of the male to provide material advantagesndash a high-quality territory nutrition parental care or protection ndash There is considerable empirical support for this mechanism
Mechanisms of mate choice evolution2 Sensory bias bull Female preference favouring a male ornament can initially
evolve under natural selection for other reasons bull Eg context of foraging or predator avoidance bull Males evolving traits that exploit this bias then become
favoured by mate choice bull There is increasing phenotypic evidence that some male
ornaments initially evolved through female sensory biases but the evolution of female sensory bias itself requires more testing
Attraction dance
bull Note the changing postures of the female Cape Gannet httpwwwyoutubecomwatchv=BhobLcMgfkE
bull Chilean Flamingos (Phoenicopterus chilensis) httpwwwyoutubecomwatchv=CUb0evFZbNM
Mechanisms of mate choice evolution3 Fisherian sexy sons bull If there are genetic components to variance in female
preference and male trait a female choosing a male with a large trait bears daughters and sons thatndash both carry alleles for a large traitndash and alleles for the preference for it
bull This genetic coupling might lead to self-reinforcing coevolution between trait and preference
bull Direct critical testing of this mechanism is difficult but molecular genetics offers new possibilities
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
Major Histocompatibility Complex MHC
bull The major histocompatibility complex (MHC) is a large genomic region found in most vertebrates
bull most gene-dense region of the mammalian genome important role in the immune system autoimmunity and reproductive success
bull The proteins encoded by the MHC expressed on the surface of cells in all jawed vertebrates and display both self antigens (peptide fragments from the cell itself) and nonself antigens (eg fragments of invading microorganisms) to a type of white blood cell called a T cell that has the capacity to kill or co-ordinate the killing of pathogens infected or malfunctioning cells
bull Helps the body recognize itself and target nonself invadersbull Genetically advantageous to outcross for variability in MHC genomebull T-shirt study by Wedekind et al 1995
MHC-dependent mate preferences in humansbull One substantial benefit of sexual reproduction could be that it allows animals to
react to a continuously changing environmental selection pressure such as coevolving parasites
bull This would be most efficient if females able to provide their progeny with allele combinations for loci crucial in the parasite-host arms race eg MHC
bull MHC influences both body odours and body odour preferences in humans and that the womens preferences depend on their hormonal status
bull Female and male students were typed for their HLA-A -B and -DR ndash Each male student wore a T-shirt for two consecutive nights ndash The next day each female student was asked to rate the odours of six T-shirts ndash They scored male body odours as more pleasant when they differed from the men in their MHC
than when they were more similar ndash This difference in odour assessment was reversed when the women rating the odours were taking
oral contraceptives ndash Furthermore the odours of MHC-dissimilar men remind the test women more often of their own
actual or former mates than do the odours of MHC-similar men ndash This suggests that the MHC or linked genes influence human mate choice today
bull Proc Biol Sci 1995 Jun 22260(1359)245-9 Wedekind C Seebeck T Bettens F Paepke AJ PMID 7630893 [PubMed - indexed for MEDLINE]
bullThe ideal weaver bird nestbull large opening bullflattened at the bottombull well attached to a branch
Attraction Structural
The weaver bird sagahellip you attract her with a fine nesthellip
Weaver birds Dikololo Preserve S Africa
Weberrsquos law
bull the ability of an individual to discriminate a difference between stimuli decreases with the size or intensity of those stimuli
bull if females choose mates based in part on tail length its more difficult for females to distinguish between males that differ slightly in tail length as the length of tails (over evolutionary time) increases
Blue bird of paradise
bull Blue Bird of Paradise Paradisaea rudolphi The Strangest Bird Sounds - video powered by Metacafe
Attraction Sounds
Peak shiftbull if a female acquires a preference (egby
imprinting on some characteristic or characteristics of her father) then later in life she may exhibit a preference for males that exhibit an enhanced version of that (or those) characteristic(s)
Lesser bird of paradise
Attraction sounds amp displays
bull Courtship display of Clarks Grebeshttppeopleekueduritchisongmatingsystemshtml about 25 down bull
Best-of-n
bull females samples a certain number of males (eg perhaps a migrant female arrives in a breeding area and visits five males and territories) then chooses as her mate the best of those sampled males
Attraction sounds amp displays
bull Andean cock-of-the-rock (Rupicola peruviana)httppeopleekueduritchisongmatingsystemshtml about 20 down
Threshold
bull a female may have a standard in terms of mate quality and chooses as her mate the first male that meets or exceeds that standard
Attraction Sounds amp Displays
bull Superb Bird of Paradise httpwwwyoutubecomwatchv=bOl54VFT1cA
Female Choicebull The flow of information is from the male to the
behavioral output of the female bull The assumption is that male quality translates into his
traits ndash visual auditory behavioral (and other) ndash cues for the female
bull Her choice is based on her ability to perceive trait(s) of the male and then use that information to decide
bull The information from one male will be compared to other males affected by the femalersquosbull cognitive abilitiesbull memorybull ability to process information from multiple sources
simultaneously (Bateson and Healy 2005)
Attraction Sounds amp Displays
bull Satin Bowerbird httpwwwyoutubecomwatchv=Ii2D9Bd5OoE
Mechanisms of mate choice evolution1 Direct phenotypic effectsbull Female preference for a male ornament can evolve as a result of
direct phenotypic benefits if the ornament reflectsndash the ability of the male to provide material advantagesndash a high-quality territory nutrition parental care or protection ndash There is considerable empirical support for this mechanism
Mechanisms of mate choice evolution2 Sensory bias bull Female preference favouring a male ornament can initially
evolve under natural selection for other reasons bull Eg context of foraging or predator avoidance bull Males evolving traits that exploit this bias then become
favoured by mate choice bull There is increasing phenotypic evidence that some male
ornaments initially evolved through female sensory biases but the evolution of female sensory bias itself requires more testing
Attraction dance
bull Note the changing postures of the female Cape Gannet httpwwwyoutubecomwatchv=BhobLcMgfkE
bull Chilean Flamingos (Phoenicopterus chilensis) httpwwwyoutubecomwatchv=CUb0evFZbNM
Mechanisms of mate choice evolution3 Fisherian sexy sons bull If there are genetic components to variance in female
preference and male trait a female choosing a male with a large trait bears daughters and sons thatndash both carry alleles for a large traitndash and alleles for the preference for it
bull This genetic coupling might lead to self-reinforcing coevolution between trait and preference
bull Direct critical testing of this mechanism is difficult but molecular genetics offers new possibilities
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
MHC-dependent mate preferences in humansbull One substantial benefit of sexual reproduction could be that it allows animals to
react to a continuously changing environmental selection pressure such as coevolving parasites
bull This would be most efficient if females able to provide their progeny with allele combinations for loci crucial in the parasite-host arms race eg MHC
bull MHC influences both body odours and body odour preferences in humans and that the womens preferences depend on their hormonal status
bull Female and male students were typed for their HLA-A -B and -DR ndash Each male student wore a T-shirt for two consecutive nights ndash The next day each female student was asked to rate the odours of six T-shirts ndash They scored male body odours as more pleasant when they differed from the men in their MHC
than when they were more similar ndash This difference in odour assessment was reversed when the women rating the odours were taking
oral contraceptives ndash Furthermore the odours of MHC-dissimilar men remind the test women more often of their own
actual or former mates than do the odours of MHC-similar men ndash This suggests that the MHC or linked genes influence human mate choice today
bull Proc Biol Sci 1995 Jun 22260(1359)245-9 Wedekind C Seebeck T Bettens F Paepke AJ PMID 7630893 [PubMed - indexed for MEDLINE]
bullThe ideal weaver bird nestbull large opening bullflattened at the bottombull well attached to a branch
Attraction Structural
The weaver bird sagahellip you attract her with a fine nesthellip
Weaver birds Dikololo Preserve S Africa
Weberrsquos law
bull the ability of an individual to discriminate a difference between stimuli decreases with the size or intensity of those stimuli
bull if females choose mates based in part on tail length its more difficult for females to distinguish between males that differ slightly in tail length as the length of tails (over evolutionary time) increases
Blue bird of paradise
bull Blue Bird of Paradise Paradisaea rudolphi The Strangest Bird Sounds - video powered by Metacafe
Attraction Sounds
Peak shiftbull if a female acquires a preference (egby
imprinting on some characteristic or characteristics of her father) then later in life she may exhibit a preference for males that exhibit an enhanced version of that (or those) characteristic(s)
Lesser bird of paradise
Attraction sounds amp displays
bull Courtship display of Clarks Grebeshttppeopleekueduritchisongmatingsystemshtml about 25 down bull
Best-of-n
bull females samples a certain number of males (eg perhaps a migrant female arrives in a breeding area and visits five males and territories) then chooses as her mate the best of those sampled males
Attraction sounds amp displays
bull Andean cock-of-the-rock (Rupicola peruviana)httppeopleekueduritchisongmatingsystemshtml about 20 down
Threshold
bull a female may have a standard in terms of mate quality and chooses as her mate the first male that meets or exceeds that standard
Attraction Sounds amp Displays
bull Superb Bird of Paradise httpwwwyoutubecomwatchv=bOl54VFT1cA
Female Choicebull The flow of information is from the male to the
behavioral output of the female bull The assumption is that male quality translates into his
traits ndash visual auditory behavioral (and other) ndash cues for the female
bull Her choice is based on her ability to perceive trait(s) of the male and then use that information to decide
bull The information from one male will be compared to other males affected by the femalersquosbull cognitive abilitiesbull memorybull ability to process information from multiple sources
simultaneously (Bateson and Healy 2005)
Attraction Sounds amp Displays
bull Satin Bowerbird httpwwwyoutubecomwatchv=Ii2D9Bd5OoE
Mechanisms of mate choice evolution1 Direct phenotypic effectsbull Female preference for a male ornament can evolve as a result of
direct phenotypic benefits if the ornament reflectsndash the ability of the male to provide material advantagesndash a high-quality territory nutrition parental care or protection ndash There is considerable empirical support for this mechanism
Mechanisms of mate choice evolution2 Sensory bias bull Female preference favouring a male ornament can initially
evolve under natural selection for other reasons bull Eg context of foraging or predator avoidance bull Males evolving traits that exploit this bias then become
favoured by mate choice bull There is increasing phenotypic evidence that some male
ornaments initially evolved through female sensory biases but the evolution of female sensory bias itself requires more testing
Attraction dance
bull Note the changing postures of the female Cape Gannet httpwwwyoutubecomwatchv=BhobLcMgfkE
bull Chilean Flamingos (Phoenicopterus chilensis) httpwwwyoutubecomwatchv=CUb0evFZbNM
Mechanisms of mate choice evolution3 Fisherian sexy sons bull If there are genetic components to variance in female
preference and male trait a female choosing a male with a large trait bears daughters and sons thatndash both carry alleles for a large traitndash and alleles for the preference for it
bull This genetic coupling might lead to self-reinforcing coevolution between trait and preference
bull Direct critical testing of this mechanism is difficult but molecular genetics offers new possibilities
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
bullThe ideal weaver bird nestbull large opening bullflattened at the bottombull well attached to a branch
Attraction Structural
The weaver bird sagahellip you attract her with a fine nesthellip
Weaver birds Dikololo Preserve S Africa
Weberrsquos law
bull the ability of an individual to discriminate a difference between stimuli decreases with the size or intensity of those stimuli
bull if females choose mates based in part on tail length its more difficult for females to distinguish between males that differ slightly in tail length as the length of tails (over evolutionary time) increases
Blue bird of paradise
bull Blue Bird of Paradise Paradisaea rudolphi The Strangest Bird Sounds - video powered by Metacafe
Attraction Sounds
Peak shiftbull if a female acquires a preference (egby
imprinting on some characteristic or characteristics of her father) then later in life she may exhibit a preference for males that exhibit an enhanced version of that (or those) characteristic(s)
Lesser bird of paradise
Attraction sounds amp displays
bull Courtship display of Clarks Grebeshttppeopleekueduritchisongmatingsystemshtml about 25 down bull
Best-of-n
bull females samples a certain number of males (eg perhaps a migrant female arrives in a breeding area and visits five males and territories) then chooses as her mate the best of those sampled males
Attraction sounds amp displays
bull Andean cock-of-the-rock (Rupicola peruviana)httppeopleekueduritchisongmatingsystemshtml about 20 down
Threshold
bull a female may have a standard in terms of mate quality and chooses as her mate the first male that meets or exceeds that standard
Attraction Sounds amp Displays
bull Superb Bird of Paradise httpwwwyoutubecomwatchv=bOl54VFT1cA
Female Choicebull The flow of information is from the male to the
behavioral output of the female bull The assumption is that male quality translates into his
traits ndash visual auditory behavioral (and other) ndash cues for the female
bull Her choice is based on her ability to perceive trait(s) of the male and then use that information to decide
bull The information from one male will be compared to other males affected by the femalersquosbull cognitive abilitiesbull memorybull ability to process information from multiple sources
simultaneously (Bateson and Healy 2005)
Attraction Sounds amp Displays
bull Satin Bowerbird httpwwwyoutubecomwatchv=Ii2D9Bd5OoE
Mechanisms of mate choice evolution1 Direct phenotypic effectsbull Female preference for a male ornament can evolve as a result of
direct phenotypic benefits if the ornament reflectsndash the ability of the male to provide material advantagesndash a high-quality territory nutrition parental care or protection ndash There is considerable empirical support for this mechanism
Mechanisms of mate choice evolution2 Sensory bias bull Female preference favouring a male ornament can initially
evolve under natural selection for other reasons bull Eg context of foraging or predator avoidance bull Males evolving traits that exploit this bias then become
favoured by mate choice bull There is increasing phenotypic evidence that some male
ornaments initially evolved through female sensory biases but the evolution of female sensory bias itself requires more testing
Attraction dance
bull Note the changing postures of the female Cape Gannet httpwwwyoutubecomwatchv=BhobLcMgfkE
bull Chilean Flamingos (Phoenicopterus chilensis) httpwwwyoutubecomwatchv=CUb0evFZbNM
Mechanisms of mate choice evolution3 Fisherian sexy sons bull If there are genetic components to variance in female
preference and male trait a female choosing a male with a large trait bears daughters and sons thatndash both carry alleles for a large traitndash and alleles for the preference for it
bull This genetic coupling might lead to self-reinforcing coevolution between trait and preference
bull Direct critical testing of this mechanism is difficult but molecular genetics offers new possibilities
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
Weberrsquos law
bull the ability of an individual to discriminate a difference between stimuli decreases with the size or intensity of those stimuli
bull if females choose mates based in part on tail length its more difficult for females to distinguish between males that differ slightly in tail length as the length of tails (over evolutionary time) increases
Blue bird of paradise
bull Blue Bird of Paradise Paradisaea rudolphi The Strangest Bird Sounds - video powered by Metacafe
Attraction Sounds
Peak shiftbull if a female acquires a preference (egby
imprinting on some characteristic or characteristics of her father) then later in life she may exhibit a preference for males that exhibit an enhanced version of that (or those) characteristic(s)
Lesser bird of paradise
Attraction sounds amp displays
bull Courtship display of Clarks Grebeshttppeopleekueduritchisongmatingsystemshtml about 25 down bull
Best-of-n
bull females samples a certain number of males (eg perhaps a migrant female arrives in a breeding area and visits five males and territories) then chooses as her mate the best of those sampled males
Attraction sounds amp displays
bull Andean cock-of-the-rock (Rupicola peruviana)httppeopleekueduritchisongmatingsystemshtml about 20 down
Threshold
bull a female may have a standard in terms of mate quality and chooses as her mate the first male that meets or exceeds that standard
Attraction Sounds amp Displays
bull Superb Bird of Paradise httpwwwyoutubecomwatchv=bOl54VFT1cA
Female Choicebull The flow of information is from the male to the
behavioral output of the female bull The assumption is that male quality translates into his
traits ndash visual auditory behavioral (and other) ndash cues for the female
bull Her choice is based on her ability to perceive trait(s) of the male and then use that information to decide
bull The information from one male will be compared to other males affected by the femalersquosbull cognitive abilitiesbull memorybull ability to process information from multiple sources
simultaneously (Bateson and Healy 2005)
Attraction Sounds amp Displays
bull Satin Bowerbird httpwwwyoutubecomwatchv=Ii2D9Bd5OoE
Mechanisms of mate choice evolution1 Direct phenotypic effectsbull Female preference for a male ornament can evolve as a result of
direct phenotypic benefits if the ornament reflectsndash the ability of the male to provide material advantagesndash a high-quality territory nutrition parental care or protection ndash There is considerable empirical support for this mechanism
Mechanisms of mate choice evolution2 Sensory bias bull Female preference favouring a male ornament can initially
evolve under natural selection for other reasons bull Eg context of foraging or predator avoidance bull Males evolving traits that exploit this bias then become
favoured by mate choice bull There is increasing phenotypic evidence that some male
ornaments initially evolved through female sensory biases but the evolution of female sensory bias itself requires more testing
Attraction dance
bull Note the changing postures of the female Cape Gannet httpwwwyoutubecomwatchv=BhobLcMgfkE
bull Chilean Flamingos (Phoenicopterus chilensis) httpwwwyoutubecomwatchv=CUb0evFZbNM
Mechanisms of mate choice evolution3 Fisherian sexy sons bull If there are genetic components to variance in female
preference and male trait a female choosing a male with a large trait bears daughters and sons thatndash both carry alleles for a large traitndash and alleles for the preference for it
bull This genetic coupling might lead to self-reinforcing coevolution between trait and preference
bull Direct critical testing of this mechanism is difficult but molecular genetics offers new possibilities
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
bull Blue Bird of Paradise Paradisaea rudolphi The Strangest Bird Sounds - video powered by Metacafe
Attraction Sounds
Peak shiftbull if a female acquires a preference (egby
imprinting on some characteristic or characteristics of her father) then later in life she may exhibit a preference for males that exhibit an enhanced version of that (or those) characteristic(s)
Lesser bird of paradise
Attraction sounds amp displays
bull Courtship display of Clarks Grebeshttppeopleekueduritchisongmatingsystemshtml about 25 down bull
Best-of-n
bull females samples a certain number of males (eg perhaps a migrant female arrives in a breeding area and visits five males and territories) then chooses as her mate the best of those sampled males
Attraction sounds amp displays
bull Andean cock-of-the-rock (Rupicola peruviana)httppeopleekueduritchisongmatingsystemshtml about 20 down
Threshold
bull a female may have a standard in terms of mate quality and chooses as her mate the first male that meets or exceeds that standard
Attraction Sounds amp Displays
bull Superb Bird of Paradise httpwwwyoutubecomwatchv=bOl54VFT1cA
Female Choicebull The flow of information is from the male to the
behavioral output of the female bull The assumption is that male quality translates into his
traits ndash visual auditory behavioral (and other) ndash cues for the female
bull Her choice is based on her ability to perceive trait(s) of the male and then use that information to decide
bull The information from one male will be compared to other males affected by the femalersquosbull cognitive abilitiesbull memorybull ability to process information from multiple sources
simultaneously (Bateson and Healy 2005)
Attraction Sounds amp Displays
bull Satin Bowerbird httpwwwyoutubecomwatchv=Ii2D9Bd5OoE
Mechanisms of mate choice evolution1 Direct phenotypic effectsbull Female preference for a male ornament can evolve as a result of
direct phenotypic benefits if the ornament reflectsndash the ability of the male to provide material advantagesndash a high-quality territory nutrition parental care or protection ndash There is considerable empirical support for this mechanism
Mechanisms of mate choice evolution2 Sensory bias bull Female preference favouring a male ornament can initially
evolve under natural selection for other reasons bull Eg context of foraging or predator avoidance bull Males evolving traits that exploit this bias then become
favoured by mate choice bull There is increasing phenotypic evidence that some male
ornaments initially evolved through female sensory biases but the evolution of female sensory bias itself requires more testing
Attraction dance
bull Note the changing postures of the female Cape Gannet httpwwwyoutubecomwatchv=BhobLcMgfkE
bull Chilean Flamingos (Phoenicopterus chilensis) httpwwwyoutubecomwatchv=CUb0evFZbNM
Mechanisms of mate choice evolution3 Fisherian sexy sons bull If there are genetic components to variance in female
preference and male trait a female choosing a male with a large trait bears daughters and sons thatndash both carry alleles for a large traitndash and alleles for the preference for it
bull This genetic coupling might lead to self-reinforcing coevolution between trait and preference
bull Direct critical testing of this mechanism is difficult but molecular genetics offers new possibilities
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
Peak shiftbull if a female acquires a preference (egby
imprinting on some characteristic or characteristics of her father) then later in life she may exhibit a preference for males that exhibit an enhanced version of that (or those) characteristic(s)
Lesser bird of paradise
Attraction sounds amp displays
bull Courtship display of Clarks Grebeshttppeopleekueduritchisongmatingsystemshtml about 25 down bull
Best-of-n
bull females samples a certain number of males (eg perhaps a migrant female arrives in a breeding area and visits five males and territories) then chooses as her mate the best of those sampled males
Attraction sounds amp displays
bull Andean cock-of-the-rock (Rupicola peruviana)httppeopleekueduritchisongmatingsystemshtml about 20 down
Threshold
bull a female may have a standard in terms of mate quality and chooses as her mate the first male that meets or exceeds that standard
Attraction Sounds amp Displays
bull Superb Bird of Paradise httpwwwyoutubecomwatchv=bOl54VFT1cA
Female Choicebull The flow of information is from the male to the
behavioral output of the female bull The assumption is that male quality translates into his
traits ndash visual auditory behavioral (and other) ndash cues for the female
bull Her choice is based on her ability to perceive trait(s) of the male and then use that information to decide
bull The information from one male will be compared to other males affected by the femalersquosbull cognitive abilitiesbull memorybull ability to process information from multiple sources
simultaneously (Bateson and Healy 2005)
Attraction Sounds amp Displays
bull Satin Bowerbird httpwwwyoutubecomwatchv=Ii2D9Bd5OoE
Mechanisms of mate choice evolution1 Direct phenotypic effectsbull Female preference for a male ornament can evolve as a result of
direct phenotypic benefits if the ornament reflectsndash the ability of the male to provide material advantagesndash a high-quality territory nutrition parental care or protection ndash There is considerable empirical support for this mechanism
Mechanisms of mate choice evolution2 Sensory bias bull Female preference favouring a male ornament can initially
evolve under natural selection for other reasons bull Eg context of foraging or predator avoidance bull Males evolving traits that exploit this bias then become
favoured by mate choice bull There is increasing phenotypic evidence that some male
ornaments initially evolved through female sensory biases but the evolution of female sensory bias itself requires more testing
Attraction dance
bull Note the changing postures of the female Cape Gannet httpwwwyoutubecomwatchv=BhobLcMgfkE
bull Chilean Flamingos (Phoenicopterus chilensis) httpwwwyoutubecomwatchv=CUb0evFZbNM
Mechanisms of mate choice evolution3 Fisherian sexy sons bull If there are genetic components to variance in female
preference and male trait a female choosing a male with a large trait bears daughters and sons thatndash both carry alleles for a large traitndash and alleles for the preference for it
bull This genetic coupling might lead to self-reinforcing coevolution between trait and preference
bull Direct critical testing of this mechanism is difficult but molecular genetics offers new possibilities
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
Attraction sounds amp displays
bull Courtship display of Clarks Grebeshttppeopleekueduritchisongmatingsystemshtml about 25 down bull
Best-of-n
bull females samples a certain number of males (eg perhaps a migrant female arrives in a breeding area and visits five males and territories) then chooses as her mate the best of those sampled males
Attraction sounds amp displays
bull Andean cock-of-the-rock (Rupicola peruviana)httppeopleekueduritchisongmatingsystemshtml about 20 down
Threshold
bull a female may have a standard in terms of mate quality and chooses as her mate the first male that meets or exceeds that standard
Attraction Sounds amp Displays
bull Superb Bird of Paradise httpwwwyoutubecomwatchv=bOl54VFT1cA
Female Choicebull The flow of information is from the male to the
behavioral output of the female bull The assumption is that male quality translates into his
traits ndash visual auditory behavioral (and other) ndash cues for the female
bull Her choice is based on her ability to perceive trait(s) of the male and then use that information to decide
bull The information from one male will be compared to other males affected by the femalersquosbull cognitive abilitiesbull memorybull ability to process information from multiple sources
simultaneously (Bateson and Healy 2005)
Attraction Sounds amp Displays
bull Satin Bowerbird httpwwwyoutubecomwatchv=Ii2D9Bd5OoE
Mechanisms of mate choice evolution1 Direct phenotypic effectsbull Female preference for a male ornament can evolve as a result of
direct phenotypic benefits if the ornament reflectsndash the ability of the male to provide material advantagesndash a high-quality territory nutrition parental care or protection ndash There is considerable empirical support for this mechanism
Mechanisms of mate choice evolution2 Sensory bias bull Female preference favouring a male ornament can initially
evolve under natural selection for other reasons bull Eg context of foraging or predator avoidance bull Males evolving traits that exploit this bias then become
favoured by mate choice bull There is increasing phenotypic evidence that some male
ornaments initially evolved through female sensory biases but the evolution of female sensory bias itself requires more testing
Attraction dance
bull Note the changing postures of the female Cape Gannet httpwwwyoutubecomwatchv=BhobLcMgfkE
bull Chilean Flamingos (Phoenicopterus chilensis) httpwwwyoutubecomwatchv=CUb0evFZbNM
Mechanisms of mate choice evolution3 Fisherian sexy sons bull If there are genetic components to variance in female
preference and male trait a female choosing a male with a large trait bears daughters and sons thatndash both carry alleles for a large traitndash and alleles for the preference for it
bull This genetic coupling might lead to self-reinforcing coevolution between trait and preference
bull Direct critical testing of this mechanism is difficult but molecular genetics offers new possibilities
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
Best-of-n
bull females samples a certain number of males (eg perhaps a migrant female arrives in a breeding area and visits five males and territories) then chooses as her mate the best of those sampled males
Attraction sounds amp displays
bull Andean cock-of-the-rock (Rupicola peruviana)httppeopleekueduritchisongmatingsystemshtml about 20 down
Threshold
bull a female may have a standard in terms of mate quality and chooses as her mate the first male that meets or exceeds that standard
Attraction Sounds amp Displays
bull Superb Bird of Paradise httpwwwyoutubecomwatchv=bOl54VFT1cA
Female Choicebull The flow of information is from the male to the
behavioral output of the female bull The assumption is that male quality translates into his
traits ndash visual auditory behavioral (and other) ndash cues for the female
bull Her choice is based on her ability to perceive trait(s) of the male and then use that information to decide
bull The information from one male will be compared to other males affected by the femalersquosbull cognitive abilitiesbull memorybull ability to process information from multiple sources
simultaneously (Bateson and Healy 2005)
Attraction Sounds amp Displays
bull Satin Bowerbird httpwwwyoutubecomwatchv=Ii2D9Bd5OoE
Mechanisms of mate choice evolution1 Direct phenotypic effectsbull Female preference for a male ornament can evolve as a result of
direct phenotypic benefits if the ornament reflectsndash the ability of the male to provide material advantagesndash a high-quality territory nutrition parental care or protection ndash There is considerable empirical support for this mechanism
Mechanisms of mate choice evolution2 Sensory bias bull Female preference favouring a male ornament can initially
evolve under natural selection for other reasons bull Eg context of foraging or predator avoidance bull Males evolving traits that exploit this bias then become
favoured by mate choice bull There is increasing phenotypic evidence that some male
ornaments initially evolved through female sensory biases but the evolution of female sensory bias itself requires more testing
Attraction dance
bull Note the changing postures of the female Cape Gannet httpwwwyoutubecomwatchv=BhobLcMgfkE
bull Chilean Flamingos (Phoenicopterus chilensis) httpwwwyoutubecomwatchv=CUb0evFZbNM
Mechanisms of mate choice evolution3 Fisherian sexy sons bull If there are genetic components to variance in female
preference and male trait a female choosing a male with a large trait bears daughters and sons thatndash both carry alleles for a large traitndash and alleles for the preference for it
bull This genetic coupling might lead to self-reinforcing coevolution between trait and preference
bull Direct critical testing of this mechanism is difficult but molecular genetics offers new possibilities
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
Attraction sounds amp displays
bull Andean cock-of-the-rock (Rupicola peruviana)httppeopleekueduritchisongmatingsystemshtml about 20 down
Threshold
bull a female may have a standard in terms of mate quality and chooses as her mate the first male that meets or exceeds that standard
Attraction Sounds amp Displays
bull Superb Bird of Paradise httpwwwyoutubecomwatchv=bOl54VFT1cA
Female Choicebull The flow of information is from the male to the
behavioral output of the female bull The assumption is that male quality translates into his
traits ndash visual auditory behavioral (and other) ndash cues for the female
bull Her choice is based on her ability to perceive trait(s) of the male and then use that information to decide
bull The information from one male will be compared to other males affected by the femalersquosbull cognitive abilitiesbull memorybull ability to process information from multiple sources
simultaneously (Bateson and Healy 2005)
Attraction Sounds amp Displays
bull Satin Bowerbird httpwwwyoutubecomwatchv=Ii2D9Bd5OoE
Mechanisms of mate choice evolution1 Direct phenotypic effectsbull Female preference for a male ornament can evolve as a result of
direct phenotypic benefits if the ornament reflectsndash the ability of the male to provide material advantagesndash a high-quality territory nutrition parental care or protection ndash There is considerable empirical support for this mechanism
Mechanisms of mate choice evolution2 Sensory bias bull Female preference favouring a male ornament can initially
evolve under natural selection for other reasons bull Eg context of foraging or predator avoidance bull Males evolving traits that exploit this bias then become
favoured by mate choice bull There is increasing phenotypic evidence that some male
ornaments initially evolved through female sensory biases but the evolution of female sensory bias itself requires more testing
Attraction dance
bull Note the changing postures of the female Cape Gannet httpwwwyoutubecomwatchv=BhobLcMgfkE
bull Chilean Flamingos (Phoenicopterus chilensis) httpwwwyoutubecomwatchv=CUb0evFZbNM
Mechanisms of mate choice evolution3 Fisherian sexy sons bull If there are genetic components to variance in female
preference and male trait a female choosing a male with a large trait bears daughters and sons thatndash both carry alleles for a large traitndash and alleles for the preference for it
bull This genetic coupling might lead to self-reinforcing coevolution between trait and preference
bull Direct critical testing of this mechanism is difficult but molecular genetics offers new possibilities
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
Threshold
bull a female may have a standard in terms of mate quality and chooses as her mate the first male that meets or exceeds that standard
Attraction Sounds amp Displays
bull Superb Bird of Paradise httpwwwyoutubecomwatchv=bOl54VFT1cA
Female Choicebull The flow of information is from the male to the
behavioral output of the female bull The assumption is that male quality translates into his
traits ndash visual auditory behavioral (and other) ndash cues for the female
bull Her choice is based on her ability to perceive trait(s) of the male and then use that information to decide
bull The information from one male will be compared to other males affected by the femalersquosbull cognitive abilitiesbull memorybull ability to process information from multiple sources
simultaneously (Bateson and Healy 2005)
Attraction Sounds amp Displays
bull Satin Bowerbird httpwwwyoutubecomwatchv=Ii2D9Bd5OoE
Mechanisms of mate choice evolution1 Direct phenotypic effectsbull Female preference for a male ornament can evolve as a result of
direct phenotypic benefits if the ornament reflectsndash the ability of the male to provide material advantagesndash a high-quality territory nutrition parental care or protection ndash There is considerable empirical support for this mechanism
Mechanisms of mate choice evolution2 Sensory bias bull Female preference favouring a male ornament can initially
evolve under natural selection for other reasons bull Eg context of foraging or predator avoidance bull Males evolving traits that exploit this bias then become
favoured by mate choice bull There is increasing phenotypic evidence that some male
ornaments initially evolved through female sensory biases but the evolution of female sensory bias itself requires more testing
Attraction dance
bull Note the changing postures of the female Cape Gannet httpwwwyoutubecomwatchv=BhobLcMgfkE
bull Chilean Flamingos (Phoenicopterus chilensis) httpwwwyoutubecomwatchv=CUb0evFZbNM
Mechanisms of mate choice evolution3 Fisherian sexy sons bull If there are genetic components to variance in female
preference and male trait a female choosing a male with a large trait bears daughters and sons thatndash both carry alleles for a large traitndash and alleles for the preference for it
bull This genetic coupling might lead to self-reinforcing coevolution between trait and preference
bull Direct critical testing of this mechanism is difficult but molecular genetics offers new possibilities
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
Attraction Sounds amp Displays
bull Superb Bird of Paradise httpwwwyoutubecomwatchv=bOl54VFT1cA
Female Choicebull The flow of information is from the male to the
behavioral output of the female bull The assumption is that male quality translates into his
traits ndash visual auditory behavioral (and other) ndash cues for the female
bull Her choice is based on her ability to perceive trait(s) of the male and then use that information to decide
bull The information from one male will be compared to other males affected by the femalersquosbull cognitive abilitiesbull memorybull ability to process information from multiple sources
simultaneously (Bateson and Healy 2005)
Attraction Sounds amp Displays
bull Satin Bowerbird httpwwwyoutubecomwatchv=Ii2D9Bd5OoE
Mechanisms of mate choice evolution1 Direct phenotypic effectsbull Female preference for a male ornament can evolve as a result of
direct phenotypic benefits if the ornament reflectsndash the ability of the male to provide material advantagesndash a high-quality territory nutrition parental care or protection ndash There is considerable empirical support for this mechanism
Mechanisms of mate choice evolution2 Sensory bias bull Female preference favouring a male ornament can initially
evolve under natural selection for other reasons bull Eg context of foraging or predator avoidance bull Males evolving traits that exploit this bias then become
favoured by mate choice bull There is increasing phenotypic evidence that some male
ornaments initially evolved through female sensory biases but the evolution of female sensory bias itself requires more testing
Attraction dance
bull Note the changing postures of the female Cape Gannet httpwwwyoutubecomwatchv=BhobLcMgfkE
bull Chilean Flamingos (Phoenicopterus chilensis) httpwwwyoutubecomwatchv=CUb0evFZbNM
Mechanisms of mate choice evolution3 Fisherian sexy sons bull If there are genetic components to variance in female
preference and male trait a female choosing a male with a large trait bears daughters and sons thatndash both carry alleles for a large traitndash and alleles for the preference for it
bull This genetic coupling might lead to self-reinforcing coevolution between trait and preference
bull Direct critical testing of this mechanism is difficult but molecular genetics offers new possibilities
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
Female Choicebull The flow of information is from the male to the
behavioral output of the female bull The assumption is that male quality translates into his
traits ndash visual auditory behavioral (and other) ndash cues for the female
bull Her choice is based on her ability to perceive trait(s) of the male and then use that information to decide
bull The information from one male will be compared to other males affected by the femalersquosbull cognitive abilitiesbull memorybull ability to process information from multiple sources
simultaneously (Bateson and Healy 2005)
Attraction Sounds amp Displays
bull Satin Bowerbird httpwwwyoutubecomwatchv=Ii2D9Bd5OoE
Mechanisms of mate choice evolution1 Direct phenotypic effectsbull Female preference for a male ornament can evolve as a result of
direct phenotypic benefits if the ornament reflectsndash the ability of the male to provide material advantagesndash a high-quality territory nutrition parental care or protection ndash There is considerable empirical support for this mechanism
Mechanisms of mate choice evolution2 Sensory bias bull Female preference favouring a male ornament can initially
evolve under natural selection for other reasons bull Eg context of foraging or predator avoidance bull Males evolving traits that exploit this bias then become
favoured by mate choice bull There is increasing phenotypic evidence that some male
ornaments initially evolved through female sensory biases but the evolution of female sensory bias itself requires more testing
Attraction dance
bull Note the changing postures of the female Cape Gannet httpwwwyoutubecomwatchv=BhobLcMgfkE
bull Chilean Flamingos (Phoenicopterus chilensis) httpwwwyoutubecomwatchv=CUb0evFZbNM
Mechanisms of mate choice evolution3 Fisherian sexy sons bull If there are genetic components to variance in female
preference and male trait a female choosing a male with a large trait bears daughters and sons thatndash both carry alleles for a large traitndash and alleles for the preference for it
bull This genetic coupling might lead to self-reinforcing coevolution between trait and preference
bull Direct critical testing of this mechanism is difficult but molecular genetics offers new possibilities
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
Attraction Sounds amp Displays
bull Satin Bowerbird httpwwwyoutubecomwatchv=Ii2D9Bd5OoE
Mechanisms of mate choice evolution1 Direct phenotypic effectsbull Female preference for a male ornament can evolve as a result of
direct phenotypic benefits if the ornament reflectsndash the ability of the male to provide material advantagesndash a high-quality territory nutrition parental care or protection ndash There is considerable empirical support for this mechanism
Mechanisms of mate choice evolution2 Sensory bias bull Female preference favouring a male ornament can initially
evolve under natural selection for other reasons bull Eg context of foraging or predator avoidance bull Males evolving traits that exploit this bias then become
favoured by mate choice bull There is increasing phenotypic evidence that some male
ornaments initially evolved through female sensory biases but the evolution of female sensory bias itself requires more testing
Attraction dance
bull Note the changing postures of the female Cape Gannet httpwwwyoutubecomwatchv=BhobLcMgfkE
bull Chilean Flamingos (Phoenicopterus chilensis) httpwwwyoutubecomwatchv=CUb0evFZbNM
Mechanisms of mate choice evolution3 Fisherian sexy sons bull If there are genetic components to variance in female
preference and male trait a female choosing a male with a large trait bears daughters and sons thatndash both carry alleles for a large traitndash and alleles for the preference for it
bull This genetic coupling might lead to self-reinforcing coevolution between trait and preference
bull Direct critical testing of this mechanism is difficult but molecular genetics offers new possibilities
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
Mechanisms of mate choice evolution1 Direct phenotypic effectsbull Female preference for a male ornament can evolve as a result of
direct phenotypic benefits if the ornament reflectsndash the ability of the male to provide material advantagesndash a high-quality territory nutrition parental care or protection ndash There is considerable empirical support for this mechanism
Mechanisms of mate choice evolution2 Sensory bias bull Female preference favouring a male ornament can initially
evolve under natural selection for other reasons bull Eg context of foraging or predator avoidance bull Males evolving traits that exploit this bias then become
favoured by mate choice bull There is increasing phenotypic evidence that some male
ornaments initially evolved through female sensory biases but the evolution of female sensory bias itself requires more testing
Attraction dance
bull Note the changing postures of the female Cape Gannet httpwwwyoutubecomwatchv=BhobLcMgfkE
bull Chilean Flamingos (Phoenicopterus chilensis) httpwwwyoutubecomwatchv=CUb0evFZbNM
Mechanisms of mate choice evolution3 Fisherian sexy sons bull If there are genetic components to variance in female
preference and male trait a female choosing a male with a large trait bears daughters and sons thatndash both carry alleles for a large traitndash and alleles for the preference for it
bull This genetic coupling might lead to self-reinforcing coevolution between trait and preference
bull Direct critical testing of this mechanism is difficult but molecular genetics offers new possibilities
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
Mechanisms of mate choice evolution2 Sensory bias bull Female preference favouring a male ornament can initially
evolve under natural selection for other reasons bull Eg context of foraging or predator avoidance bull Males evolving traits that exploit this bias then become
favoured by mate choice bull There is increasing phenotypic evidence that some male
ornaments initially evolved through female sensory biases but the evolution of female sensory bias itself requires more testing
Attraction dance
bull Note the changing postures of the female Cape Gannet httpwwwyoutubecomwatchv=BhobLcMgfkE
bull Chilean Flamingos (Phoenicopterus chilensis) httpwwwyoutubecomwatchv=CUb0evFZbNM
Mechanisms of mate choice evolution3 Fisherian sexy sons bull If there are genetic components to variance in female
preference and male trait a female choosing a male with a large trait bears daughters and sons thatndash both carry alleles for a large traitndash and alleles for the preference for it
bull This genetic coupling might lead to self-reinforcing coevolution between trait and preference
bull Direct critical testing of this mechanism is difficult but molecular genetics offers new possibilities
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
Attraction dance
bull Note the changing postures of the female Cape Gannet httpwwwyoutubecomwatchv=BhobLcMgfkE
bull Chilean Flamingos (Phoenicopterus chilensis) httpwwwyoutubecomwatchv=CUb0evFZbNM
Mechanisms of mate choice evolution3 Fisherian sexy sons bull If there are genetic components to variance in female
preference and male trait a female choosing a male with a large trait bears daughters and sons thatndash both carry alleles for a large traitndash and alleles for the preference for it
bull This genetic coupling might lead to self-reinforcing coevolution between trait and preference
bull Direct critical testing of this mechanism is difficult but molecular genetics offers new possibilities
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
Mechanisms of mate choice evolution3 Fisherian sexy sons bull If there are genetic components to variance in female
preference and male trait a female choosing a male with a large trait bears daughters and sons thatndash both carry alleles for a large traitndash and alleles for the preference for it
bull This genetic coupling might lead to self-reinforcing coevolution between trait and preference
bull Direct critical testing of this mechanism is difficult but molecular genetics offers new possibilities
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
Mechanisms of mate choice evolution4 Indicator mechanisms (lsquogood genesrsquo or lsquohandicap
mechanismsrsquo) bull attractive male traits reflect broad genetic quality bull Inherent in such mechanisms is the maintenance of genetic variation
the lsquoparadox of the lekrsquo and parasite- and pathogen-mediated mechanisms have been suggested as potential solutions
bull In addition other advantageous genes and relative freedom from deleterious mutations might lead to high male condition and expression of sex traits
bull Female preference for such traits can provide genetic benefits to those of her offspring that inherit favourable alleles from their father
bull The resolution of the lek paradox remains a crucial area for sexual selection research (to be continuedhellip)
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
Attraction dance
bull Wilsons Bird Of Paradise - video powered by Metacafe
Wilsonrsquos bird of paradise
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
Mechanisms of mate choice evolution5 Genetic compatibility mechanisms As well as additive
genetic benefits reflected by indicator traits there might be non-additive benefits from choosing a mate with alleles that complement the genome of the chooser Examples have been found for instance in major histocompatibility complex (MHC) genes and compatibility advantages might be one adaptive reason for multiple mating by females
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
Mechanisms of mate choice evolution
bull The evolution of mate choice is based either on direct selection of a preference that gives a fitness advantage (mechanisms 1 2) or on indirect selection of a preference as it becomes genetically correlated with directly selected traits (mechanisms 3 4) In addition rather than favouring any particular display trait mate choice might evolve because it conveys non-additive genetic benefits (mechanism 5) These mechanisms are mutually compatible and can occur together rendering the evolution of mating preferences a multiple-causation problem (From Andersson and Simmons 2006)
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
- Slide 1
- Decision making and mates
- Vogelkop Bowerbird Amblyornis inornatus
- Slide 4
- Major Histocompatibility Complex MHC
- MHC-dependent mate preferences in humans
- Slide 7
- Slide 8
- Slide 9
- Weberrsquos law
- Attraction Sounds
- Slide 12
- Peak shift
- Attraction sounds amp displays
- Slide 15
- Best-of-n
- Slide 17
- Slide 18
- Threshold
- Attraction Sounds amp Displays
- Slide 21
- Female Choice
- Slide 23
- Mechanisms of mate choice evolution
- Slide 25
- Attraction dance
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
-
