NSCI 1404 Study Guide - Final Guide: Bivalvia, Chordate, Survivorship Curve
15 Feb 2017
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Document Summary
Be able to discuss the reproductive biology of fishes, amphibians, reptiles, birds, and mammals in relationship to the transition between aquatic and terrestrial existence (e. g. external vs. internal fertilization). The evolution of vertebrate reproductive systems parallels the move to land. Fishes amphibians reptiles birds & mammals. Spawning: where eggs and sperm are released into the water, triggered by environmental conditions (ex: temp) low chance of individual survival. Huge number of eggs and sperm being produced. Spatial and temporal aggregations for higher chance of survival rate. Prerequisite for success on land because sperm need to swim (air is no good: oviparity: egg laying. Eggs are fertilized internally and laid out in nest (birds) Protect eggs from dessication with waterproof membranes/shells. Embryo"s develop entirely on nutrients stored in the egg: viviparity: live bearing. Internal fertilization, but the young get nutrition from mother. Viviparity exists in all vertebrate groups except crocodiles, turtles, and birds retain embryo within mother"s body: ovoviparity.
