BI207--- species invasion: equilibrium theory, invasive species trends--lec2

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equilibrium theory of island biogeography—MacArthur & Wilson (1967)

  • immigration and extinction on islands are linked

  • immigration- extinction= biodiversity

  • immigration is positively correlated with— size of island and closeness to source landmass

  • extinction is correlated with— size of island (inversely) and number of resident species and populations

theory partly explained by the species- area relationship (the larger the area, the greater the potential species diversity),, e.g. the islands around New Guinea show a clear correlation between surface area and diversity of resident bird species

[most habitats around the world show this species area relationship]


<ul><li><p>immigration and extinction on islands are linked</p></li><li><p>immigration- extinction= biodiversity</p></li><li><p>immigration is <u>positively</u> correlated with— size of island and closeness to source landmass</p></li><li><p>extinction is correlated with— size of island (inversely) and number of resident species and populations</p></li></ul><p>theory partly explained by the <strong>species- area relationship</strong> (the larger the area, the greater the potential species diversity),, e.g. the islands around New Guinea show a clear correlation between surface area and diversity of resident bird species</p><p><mark data-color="green" style="background-color: green; color: inherit;">[most habitats around the world show this species area relationship]</mark></p><p></p>
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Equilibrium theory of Island Biogeography Case Study: The Krakatau Eruption (1883)

—search up—

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Equilibrium theory of Island Biogeography Wilson & Simberloff (1969) Mangrove Repopulation Experiment

  • they tested the theory by fumigating two isolated patches of mangrove island (one near the coast, the other distant) and monitoring the immigration rates from nearby mangroves

  • the nearest isalnd repopulated much more quickly and after 400 days the distant island had failed to recover its former biodiversity


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