BIOL 1070 Midterm: Bio 1070 Midterm 1.doc

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A variety of genes, species & ecosystems. Shaped by billions of years of evolutionary history of life forms interacting with each other & their environment. Altered by human activity with lasting impacts at large scales that are difficult to predict. What factors contribute to threats of native freshwater. Not host-dependent; can settle on & attach to any solid surface. [ adult glochidia fish host juvenile adult ] Embryo found in the sac in the gills; called marsupium. Glochidia is a little shell with a tooth used to clamp onto fish gill. Primary reason for attaching to fish gill is for nutrients from fish"s blood. Female can release up to a million offspring & online about 10 usually live. Cysts form around glochidia so that the fish does not leak blood. Glochidia attract fish by: a lure (modified mantle tissue mimics fish or invertebrate prey item, conglutinates (membrane sacs produced by the mussel packed with glochidia; mimic host pray)

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