BIOLOGY 273 Final: Biology 273 (all class notes)
Document Summary
Last majority of organisms found in marine, shallow region. At 1100m, the light disappears and so does heat. Distribution based on temp, depth, water conditions. Deep pegalic - dark, high pressure, cold environment. Can feed on invertebrates so diversity increases a bit. Produce lots of eggs (ex. cod fish) Very few eggs that are large and there are a lot of parental investment (ex. hagfish) Lecithotrophy - female produces large egg, but retains it in utero until it hatches. Advantage: hides eggs from predators, can"t get swept away by storm. Matrotrophy - female supplies nutrients to embryo. Oophagy - eats eggs, as they come in oviduct. Epithiliotrophy - female produces nutrients in lining of duct and young graze it off for food. Placentation - placenta is formed, nutrients are passed to embryo. Runs from holyoke dam to turners falls. Ladders are for jumping fish like salmon. Pterygiophore - inside fins (radial or basal) Large elements that support basis of fin.
