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Island Biogeography

Equilibrium Theory of Island Biogeography - short comings!

  • 5.

    “Equilibrium” not yet reached in some cases

    • Great Britain - continental island - shares many

orchid and bee pollinators with Europe, including bee mimic orchids and their pollinators

  • 120 native bee species, but

declining

  • Ophrys apifera apparently

has lost its specific bee pollinator and is now entirely selfing

Island Biogeography

Equilibrium Theory of Island Biogeography - short comings!

  • 6.

    Not predicted outcomes (or real life is more complex!)

    • Florida Key mangrove arthropod communities - experimental test by Dan

Simberloff

  • Four islands, far and near, had arthropod community exterminated and then

biodiversity assessed at regular intervals

Island Biogeography

Equilibrium Theory of Island Biogeography - short comings!

      • 6.

        Not predicted outcomes (or real life is more complex!)

  • Barro Colorado Island - continental island (formed with Panama Canal)

  • Carnivores went “extinct” almost immediately

    • Seed eating herbivores increased tremendously

    • Rapid changes in plants not predicted by EToIB

Island Biogeography

Equilibrium Theory of Island Biogeography - short comings!

  • Equilibrium reached within a year, but ‘overshooting’ before stabilizing

  • Species number fit distance of islands and pre-defaunation levels

  • Actual species varied

Simberloff & Wilson 1970. Experimental zoogeography of islands: a two-year record of colonization. Ecology 51: 934-937.

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