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Island Biogeography

Equilibrium Theory of Island Biogeography - short comings!

1. immigration - not just affected by distance, but also island size

‘target’ effect

immigration

extinction

Island Biogeography

Equilibrium Theory of Island Biogeography - short comings!

  • 3.

    Diversity of habitats increases with island size

    • keystone species change carrying capacity

    • permits in-island speciation (~300

introductions 3000 species in Hawaii)

Metrosideros - ohia

Hawaiian bird diversity increases

Island Biogeography

Equilibrium Theory of Island Biogeography - short comings!

2. extinction - not just affected by size, but also distance

‘rescue’ effect - extinction bailed out by recolonization

immigration

extinction

Island Biogeography

Equilibrium Theory of Island Biogeography - short comings!

4. Archipelago effect - islands influence each other

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