BIOL 1070 Study Guide - Fish Gill, Ecological Niche, Continental Drift

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12 Aug 2013

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Biodiversity is the variety of genes, species and ecosystems. Shaped by billions of years of evolutionary history of interaction between environments and life forms (natural phenomenon, other species, etc. ) Human activity can have lasting impacts at large scales that are difficult to predict. What factors contribute to the threats to native freshwater mussel biodiversity in the great lakes region: mass propagation of mussels, pollution, human impacts, invasive species, pollution, overfishing, temperature fluctuation. Bivalves develop in 3 ways (ontogenic variation; not all freshwater mussels develop in the same way) By passing early development as a parasitic stage on a host (unionids) By producing veliger larvae ( in dreissena polymorpha) By releasing fully developed young mussels (rare) Glochidia which attach to a fish gills by clamping down onto the finger-like gill extensions, suck nutrients out of the blood of the fish; eventually leave the fish and grow till the become a full sized adult) Sometimes release a few million of these glochidia.

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