FNR 24150- Final Exam Guide - Comprehensive Notes for the exam ( 37 pages long!)

• School: Purdue University
• Department: Forestry & Natural Resources
• Course: FNR 24150
• Professor: Dr.Christie

Document Summary

Why land: unexploited food resources: aquatic habitat niches occupied, lack of large terrestrial predators: largely primitive plants and invertebrates, low oxygen in warming water, unlimited oxygen on land. Origin of salamanders: tiktaalik- late devonian (375 mya) 1st tetrapod with proper neck enabling greater flexibility: ichthyostega- late devonian ( mya) Ability to breathe air for short periods of time: eryops- permian (270 mya) Structurally has some features that would appear in later reptiles: diplocaulus- middle to late devonian (230-240 mya) Temperature sex differentiation is where the temperature experienced during embryonic or larval development determine the sex of the offspring instead of genetics. Temperature sex differentiation is observed in the order crocodylia and in most of the species in the order. Chelonia, except for the family trionychidae or the soft-shelled turtles, which use genetic sex determination to determine sex of the offspring. The current issue surrounding the survival of species that rely on temperature sex differentiation is global warming.