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Island Biogeography

  • water dispersed plants arrived quickly and have maintained at about

50 species

Differential rates!

  • wind and then animal dispersed species

arrived later

  • immigration rates slowing down, extinction

rates increasing

Island Biogeography

Equilibrium Theory of Island Biogeography

immigration rate - starts high, then saturates extinction rate - starts low, then rises equilibrium species (s) number - where two rates (T) intersect

T

s

Island Biogeography

Theory of Island Biogeography - unifying theory to explain these three basic characteristics of insular biotas (1963)

  • 1.

    Species-area relationships

  • 2.

    Effect of isolation

  • 3.

    Species turnover, but numbers same

Robert MacArthur - ecologist, competition

E. O. Wilson - ant taxonomist, biogeographer

Island Biogeography

Equilibrium Theory of Island Biogeography

distance effect - near vs. far island will have different colonizations size effect - large vs. small island will have different extinction rates equilibrium species (s) number varies!

immigration

extinction

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