Species Richness on Islands

Species Richness on Islands - • Rate at which species...

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1/31/11 Species Richness on Islands Islands provide excellent study tools for biogeography studies Islands – also include mountain tops, natural woodland fragments (any patch surrounded by unsuitable habitat for island species) MacArthur and E.O. Wilson developed a hypothesis of island biogeography to identify important determinants of species diversity on islands.
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1/31/11 Island Biogeography Newly formed oceanic island will receive colonizing species from a distant mainland Factor affecting number of species that will inhabit the island Rate at which new species immigrate to the island
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Unformatted text preview: • Rate at which species become extinct on the island – Island physical feature that affect these rates • Size • Distance from mainland • Small islands have fewer immigrants and higher extinction rates • Closer island will have more immigrants than a far island • Immigration and extinction rates also depend of the number of species already on the island – As species increase the immigration rate of new species declines because it is most likely that this species is already represented...
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Species Richness on Islands - • Rate at which species...

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