c3 - Island Biogeography Island biogeography Patterns of...

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Island Biogeography
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Patterns of species diversity on islands have long attracted the attention of ecologists Why? Islands are bounded habitats Islands have typically fewer species than similar continental areas Islands can be considered the independent replicates of large-scale experiments Species on Islands - Have higher densities than mainland -Expand into more habitats Island biogeography
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Developed in 1967, by Robert MacArthur and Edward O. Wilson Their theory proposed the following: (1) The number of species on an island balances regional processes governing immigration against local process governing extinction (2) Diversity results in an equilibrium between extinction and colonization Equilibrium Theory of Island Biogeography Species Diversity is a function of SIZE of island and DISTANCE from mainland
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Equilibrium Theory of Island Biogeography continued Addition of species to an island results from immigration : The rate of arrival of new species is a declining function of the number of species already on the island Large islands have higher immigration rates Removal of species from an island results from extinction : The rate of extinction is an increasing function of the number of species already on the island Small islands have higher extinction rates
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Amphibians and Reptiles in the West Indies Area Effect Only
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Both area and distance affect bird diversity The Distance and Area Effect
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c3 - Island Biogeography Island biogeography Patterns of...

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