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What do you do when you find an unknown invertebrate?
a) squish itb) call Homeland Security Departmentc) use a dichotomous key to identify it
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Annelida: Oligochaeta
Hermaphroditic; sexual and asexual reproduction. Usually paratomy (budding), also create cocoons filled with embryos.
Wide spread, many habitats and trophic levels
Some spp used as pollution indicators- very tolerant
Bioturbators
http://www.inhs.uiuc.edu/~sjtaylor/cave/oligochaeta.html
Bilaterally symmetrical
Segmented coelomates, each segment w/ chaetae (little hairs/bristles)
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Annelida: Hirudinea (leaches)
Dorsoventrally flattened & segmented
Mouth surrounded by oral sucker, feeding modes range from parasites, scavengers and predators
Only 2 common U.S. genera that attack humans; sufficient blood taken so that leach may be 5 times original mass http://www.nanfa.org/akiweb/658.JPG
Used to support large industry in Europe during 18th and 19th centuries for medicinal purposes
Hirudo medicinalis raised in ponds in large numbers (has been introduced to NA several times but unsuccessful)
http://www.nytimes.com/2006/02/07/science/07leec.html
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Famous invertebrates from Hollywood!
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http://images.google.com/imgres?imgurl=http://test.dnr.nsw.gov.au/care/wetlands/facts/paa/invertebrates/images/water_mite_eylais.jpg&imgrefurl=http://test.dnr.nsw.gov.au/care/wetlands/facts/paa/invertebrates/watermites_aquaticspiders.html&h=338&w=400&sz=20&hl=en&start=14&sig2=eKOanf2HjZpwetS9dOHqEA&tbnid=Mqsx3hWcSPtdEM:&tbnh=105&tbnw=124&ei=OQEiR5adKaeceMq70KIC&prev=/images%3Fq%3Dwater%2Bmite%26gbv%3D2%26svnum%3D10%26hl%3Den
Arachnida: Hydrachnidia, water mites
Look like tiny spiders, 6 legs
Most carnivorous or parasitic
Separate males and females
Can be very abundant in weedy areas, usually found in shallow waters
Beautiful colors (fade w/ preservative)
Hard to identify
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Phylum Mollusca(Life in a shell)
>100,000 spp.
Gastropods-snails & slugs
Bivalves- clams/mussels
Cephalopoda (squids, octapus, cuttlefish, nautilus- marine)
Higher taxonomy messy
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You name it, some gastropod does it
70% of all mollusks
marine, freshwater and terrestrial habitats.
About 500 species in the freshwaters of North America, north of Mexico:
350 prosobranchs (derived from marine)gill (ctenidium)operculum
150 pulmonates (derived from terrestrial)lung=modified mantel cavity
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Campeloma decisum
Valvata bicarinata
http://members.aol.com/mkohl1/FWshells.html =picture source
Physella/Physa spp.
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Consider a snail & leech of about same tissue mass.
What is the primary physical diff between them?
How does this diff affect their predators & where they live.
What affects their habitat choice more- trophic level or potential predators?
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Bivalves
NA bivalve fauna most diverse in word
Unionoidea ~278 spp
Corbiculacea 36 native and 4 introduced
Dreissenoidea 2 spp (zebra and quagga mussels)(more later)
sup
erfa
mil
ies
Mucket
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Crustaceans
Specious, abundant and ecologically important
>35,000 species mostly marine, some fw & terrestrial -anatomically diverse--fused segments or specialized appendages -important trophic component of many systems
Crustaceans have:-2 pairs of antennae-most body segments bear paired, jointed appendages -all crustaceans go through a free nauplius stage or show evidence of an egg-nauplius stage
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Crustaceans you should know
Order Anostraca; fairy shrimp
temporary pools or very saline habitats (e.g. brine shrimp: Artemia salina)
swim on backs by beating appendages; also serves to obtain food
either sexual or parthanogenic eggs; make resting eggs that can hatch out when put in water, “sea monkeys”
http://www.cdpr.ca.gov/docs/es/esgifs/fairy.gif
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bilateral copulation (e.g. first one side then the other); after mating female sheds anterior half of exoskeleton so that brood chamber plates are functional; fertilized eggs and young stay in brood chamber, young find their way out the posterior end by trial and error. http://www.iii.to.cnr.it/limnol/bentos/foto/Asellus_aquaticus.jpg
Order Isopoda (aquatic sow bugs)
most spp. marine or terrestrial; 130 f.w. spp. in N.A. flattened dorsoventrallyscavengersmales carry females before mating, waiting for preadult exoskeleton shed
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Order Amphipoda (superorder Pericarida, scuds)
laterally compressedcrawl or swimrespiration through gillsusually benthic some “dart” into pelagic zone
omnivorous scavangers; will eat dead animals, leaves, organic debris and graze surface films
male carries female until she molts (amplexus), they separate briefly and re-join to copulate, shortly thereafter the female ovulates and oviposits; eggs and developing young reside in the marsupium, young are released at the females next molt
http://www.nativefish.org/Gallery/other/Gammarus-sp..htm
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When J. B. S. Haldane, a British geneticist, was asked what his studies of nature revealed about God,
he replied, "An inordinate fondness for beetles."
Fresh water Insects
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5 aquatic orders, almost all spp have aquatic larvae
Ephemeroptera TrichopteraOdonata MegalopteraPlecoptera
5 partially aquatic orders, most species are terrestrial, but some spp have aquatic life stages
Heteroptera LepidopteraColeoptera NeuropteraDiptera
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Ephemeroptera: mayflies
http://www.waterbugkey.vcsu.edu/php/orderdetails.php?idnum=8
~675 spp
Streams and littoral areas of lakes
Important fish food
Usually 3 caudal filaments
Abdominal gills
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Adults do not feed
Females oviposit usually at water surface
Burrowing mayflies (Hexagenia) important species in western Lake Erie
http://www.heidelberg.edu/depts/wtr/krieger.html
Mating swarm near Sandusky River
Collecting females at Windsor
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Hexagenia spp.Ecologically Important
– Biological Indicator (sensitive to low oxygen)– Nearly extirpated in 1950’s due to eutrophic
conditions– Populations currently resurging in western Lake
Erie
http://www.grahamowengallery.com/fishing/fly-tying/Hexagenia_limbata-800.jpg
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Hexagenia spp.Important food resource for fish
– ~ 20% (annually) of Yellow Perch diets in western Lake Erie (Tyson and Knight, 2001)
– Very large compared to other benthic prey – Hexagenia recolonization may be responsible
for increased growth and recruitment in Yellow Perch
http://www.flyfishusa.com/newsletter/070404/hex-hatch-opener.jpg
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Dreissena spp.Ecosystem Engineers
– Dreissena colonizing soft sediments in western Lake Erie
– Results in change the physical structure of the lake bottom
Photo by C. Mayer and P. Bichierhttp://pubs.usgs.gov/fs/FS-036-99/images/tn-OH_fig04.jpg
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Small Scale Habitat Selection
• 3 Habitat Types– 1) bare sediment 2) artificial clusters 3) live Dreissena
• 5 mayfly densities; 100 to 1200/m2
• 48 hours• 3 replicates (N=15)
Bare sediment
Artificial Dreissena
Live Dreissena
No structure or food
Structure and food
Structure only
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Hexagenia select for live Dreissena clusters
0%
20%
40%
60%
80%
100%
100 200 400 800 1200
Hexagenia density (number/m2)
% H
ex
age
nia
in h
ab
ita
t
live mussels
artificial clusters
bare sediment
•All 3 habitats significantly different
DeVanna et al. in prep
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75% of Hexagenia inhabited high-density Dreissena habitats
0%
10%
20%
30%
40%
50%
0% 25% 50% 100%
% Dreissena coverage
% H
ex
age
nia
in h
ab
ita
t
A
A
BB
DeVanna et al. in prep
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Odonata
Anisoptera: dragonfliesZygoptera: damselflies
~434 spp
Most larvae in lentic (lake or slow water) habitats
Larvae large and predatory
Elongate hinged labium
1-6 yrs
http://www.naturewatch.ca/eman/reports/publications/99_montane/odonata/odonatafig06.html
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http://www.entomology.umn.edu/museum/links/coursefiles/Odonate%20characters.html
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Plecoptera: stoneflies
~614 spp
Most common in fast, cold streams
Larvae predators
2 long tail filaments
Long antennae
Larvae crawl rather than swim
Adults live days to weekshttp://www.weeksbay.org/newsletter/Sum_2003/Pg8_1.htm
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http://www.wildscape.com/earrings.asp
Trichoptera: Caddisflies
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http://www.nativefish.org/Gallery/other/Caddisfly.htm
~1400 spp
Lotic & lentic
Adults terrestrial and easily identified, but many larvae unknown
Some build silk nets to catch preySome free living predatorsSome build cases
Can be dominant in streams
Many fish feed on larvae
Can have large hatches
http://www.epa.gov/bioindicators/html/caddisflies.html
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Corydalidae
http://www.epa.gov/bioindicators/html/photos_invertebrates.html
Megaloptera: fishflies and alderflies
7-8 lateral filaments (O2 uptake) & large mandibles
Can be confused with Coleptera
Adults, large, secretive & terrestrial
Lentic larvae have caudal respiratory tubes
Larvae are predators
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5 aquatic orders, almost all spp have aquatic larvae
Ephemeroptera TrichopteraOdonata MegalopteraPlecoptera
5 partially aquatic orders, most species are terrestrial, but some spp have aquatic life stages
Diptera LepidopteraColeoptera NeuropteraHeteroptera
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Diptera: flies & midges
Many families and spp
Differ greatly in ecology (habitat – feeding…….)
Only larvae are aquatic Lack segmented thoracic legs
Trophic importance in many systems
Some vectors of disease (e.g. mosquitoes)
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http://www.biol.wwu.edu/407/407/Crustaceans.html
Chironomidae: midge larvae (+ 2000 spp)
Very important fish food
Wide range of ecology
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http://alpaca.cs.umb.edu/gallery/Aquatic-Invertebrates/tipulidD_thm
Tipulidae: cranefly larvae
http://www.iii.to.cnr.it/limnol/bentos/cauborus.JPG
Chaoboridae: phantom midge larvae
Pelagic predators
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Coleoptera: beetles
Only 3% of beetles have aquatic stage (still many spp!)
1450 in NA
Spp w/ aquatic larvae and adults
http://www.ru.ac.za/academic/departments/zooento/Martin/elmidae.html
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http://dnr.state.il.us/orep/ecowatch/RIVER/bugs/page1.htm
“water pennies”
Larvae aquatic, adult riparian
http://academic.emporia.edu/aberjame/wetland/wildlife/wild24.jpg
Whiligigg beetles
Adults and larvae aquatic
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Heteroptera: true bugs
Gerridae: water striders
http://www.inhs.uiuc.edu/~sjtaylor/gerromorph/striders.html
Aquatic larvae and adult
Predators
Notonectidae: backswimmers
Sucking predators
Creepy!!
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http://www.agls.uidaho.edu/ento/SixleggedWonders/insects_of_idaho/hemiptera.htm
http://creatures.ifas.ufl.edu/misc/bugs/belostomatid01.htm
Belostomatidae: giant waterbugs
Voracious predators
Adults can fly
In some spp males carry eggs on back
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-Floating plankton: phyto, zoo, sestonstream drift: animal or detritus
-On a surface (moving or still water)plant: low qualityalgae: on sediment, rock, plantanimal: probably hidingdetritus: very low quality, but doesn’t hide, associated microbes = good food
Balance of algae-animal-microbe-detritus affects C:N:P ratio. In general high N & P = good food.
Things zoobenthos can eat: location and quality
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Duarte, C.M. 1992. Nutrient concentration of aquatic plants: pattern across species. Limnol & Oceonog 37:882-889
Relatively few benthic inverts eat live macrophytes.Why?
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pelagia
So why are the invertebrates in the littoral zone if they don’t eat the plants?
low benthos density & diversity
high benthos density & diversity
See 24.5
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Take home points
--Benthos are much more diverse (and interesting ) than zooplankton --Humans tend to study larger size classes--Many different feeding modes--Richness and abundance highest in litoral zones, associated with macrophytes or other structures--Often important energy source to fish