Historic Perspective on Wildlife in North America Understanding “why” sometimes requires perspective Vicariance Biogeography (sec. 20.3 of text) Climate change & associated shifts in habitat Human impact Example of Vicariance Biogeography Panamanian Land Bridge formed ~ 2.5 mya
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1) Species of all types, sizes, from all regions & habitats
2) Magnitude of human-caused extinction
3) Time scale of species losses
4) Size and growth rate of human population