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BIOL 1070 Lecture Notes - Glochidium, Unionidae, Veliger

Course Code
BIOL 1070
Wright& Newmaster

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What is biodiversity? :
- Biodiversity is the variety of genes, species & ecosystems
- shaped by billions of years of evolutionary history of life forms interacting with
each other and their environment
- Altered by human activity with lasting impacts at large scales that are difficult to
predict. * Variation = key concept.*
Theodosius Bobzhansky:
Evolutionary concepts
“Nothing in biology makes sense except in the light of Evolution”
Darwin- “Descent with modification from common ancestors”
What do we know?- identifying important info
- human impacts
- agricultural runoff
- invasive species
- water temperature fluctuations
- over fishing
- 1 = glochidia, 2=host dependent (can not complete life cycle without attaching to ,
3= dispersed in water
Freshwater Bivalves develop in 3 Ways (bivalves 2 shells that are symmetrical)
1. By producing veliger larvae(e.g dreissena polymphora)- zebra fish?
2. by releasing fully developed young mussels(RARE) passing early development as a parasitic stage on a host (e.g Unionids)
Adults are dieshious – separate female and male forms, males release sperm in exhale
side, female take in inhalant state. Fertilized egg = embryo
Unionid larvae: glochidia
-cannot swim or crawl
Attach to host fish gills
Strategies for infecting fish hosts:
1. lure
2. Conglutinates
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