Reproduction and Conservation Kim Terrell Jessa Madosky.
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Transcript of Reproduction and Conservation Kim Terrell Jessa Madosky.
Reproduction and Reproduction and ConservationConservation
Kim TerrellKim Terrell
Jessa MadoskyJessa Madosky
Sea Turtle Sex RatiosSea Turtle Sex Ratios
Warmer temperatures favor Warmer temperatures favor femalesfemales
Cooler temperatures favor Cooler temperatures favor malesmales
85% of hatchlings in the 85% of hatchlings in the southern US are female nowsouthern US are female now
Global warming?Global warming?
http://www.turtletime.org/images/nest.gif
Sandtiger Shark Sandtiger Shark CannibalismCannibalism
Grey nurse sharks Grey nurse sharks lay eggs that hatch lay eggs that hatch inside their uterusinside their uterus
The babies then The babies then eat each other to eat each other to survive until birthsurvive until birth
Only two are born – Only two are born – one from each one from each uterus uterus
Giant Pandas
Give birth to 2 cubs…
… but only raise one!
What happens to the other one?
What happens in zoos?
From Bjork and Pitnick, Nature 441, 742-745 (8 June 2006)
Fly is 1.5mm, sperm is 60mm!
1000x longer than human sperm!
The fruit fly!!! (Drosophila bifurca)
Who gets the prize for longest sperm in the world?
Hooked on sperm…Hooked on sperm…
Rodent sperm from Immler et al., PLoS One online, 24 Jan 2007
The sperm from some rodents actually has a hook-shaped head!
(1) House mouse(2) Norweigan rat
Cheetah ConservationCheetah Conservation
Namibia
Population in serious decline due to conflict with farmers
Poor reproduction in captivity
TeratospermiaEjaculation of >60% morphologically abnormal
spermatozoa
Tetra-cephalic, biflagellate
Spermatid (immature sperm)
Abnormal acrosome, bent midpiece, retained cytoplasmic droplet
Normal sperm Microcephalic, tetra-flagellate
Genome Resource BankingGenome Resource Banking•Maintenance and preservation of genetic diversity in captive populations
•‘Rescuing’ genes
•Avoid translocations between breeding facilities
•Avoid importations from the wild
•Insurance against natural catastrophe
Horse ImmunocontraceptionHorse Immunocontraception
Island environment with limited resourcesIsland environment with limited resources Immunocontraception is used to reduce Immunocontraception is used to reduce
the number of horses that need to be the number of horses that need to be removed and increase survival in maresremoved and increase survival in mares
Immuno Wha?Immuno Wha? Pig egg proteins Pig egg proteins
injected cause a injected cause a immunological immunological response to a protein response to a protein found on the egg found on the egg
Antibodies are Antibodies are produced that bind to produced that bind to the sperm receptors the sperm receptors on the eggon the egg
The sperm can’t bind to the egg The sperm can’t bind to the egg so fertilization is preventedso fertilization is prevented
http://www.bio.davidson.edu/Courses/Molbio/MolStudents/spring2005/Champaloux/fourth.html
Questions???Questions???