mammals biogeography

biogeography

study of the distribution of organisms; where it lives

biogeography influcenced by

tectonic plates, geologic patterns, animal locomotion, climate, anthropogenic impacts

vicariance speciation

speciation because of new landscape divisions

dispersal speciation

already 3 landscapes and the animals disperse to new areas

great american biotic exchange

many northern mammals dispersed down; not many moved up

glaciation in bering land bridge

help lions and bears cross to Norther america

island biogeography

bigger islands and closer islands have more species

latitudinal gradient

more species as you decrease latitude (get closer to equator)

elevational gradient

less species in higher elevations