BIO 200 Lecture Notes - Lecture 31: Insular Biogeography, Krakatoa, Charismatic Megafauna
7 Dec 2016
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Document Summary
The theory of island biogeography: the lesson of krakatau, island biogeography explains species distributions in new environments, immigration and extinction, reaching equilibrium, size and isolation. Why do we care: terrestrial islands: reversing the island model, real life data, protecting the equilibrium, reserve design, charismatic megafauna. Island biogeography: basic outlines of the history of krakatau. Within 3 years since the explosion, 43 species seen. No large mammals seen poor dispersants: rationales for the new inhabitants of krakatau (ex. : why are there a lot of birds?) 10 years - coconuts arrive, about 85 species. 25 years - dense forests, 243 species (including many birds. 50 years - 47 vertebrates, few new birds. Populations aren"t declining but # of new species seen is declining: the theory of island biogeography. Explains how plant and animals distribute in a new environment. Predict species diversity / # of species present in ecological time. Species # defined by 2 forces: immigration + extinction.
