2.3: Island biogeography

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7 Terms

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Theory of island biogeography

A theory that demonstrates the dual importance of habitat size and distance in determining species richness.

  • ”Island” refers to any isolated habitat

<p><span style="background-color: transparent;"><span>A theory that demonstrates the dual importance of habitat size and distance in determining species richness.</span></span></p><ul><li><p>”Island” refers to any isolated habitat</p></li></ul><p></p>
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Species Richness

  • Both habitat size and distance determine species richness

  • Species richness increases as:

    • The size of the habitat increases

    • The distance between lands decreases 

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Factors that affect species richness

  • Latitude

  • Time

  • Habitat size

  • Distance from other communities

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Latitude

species richness declines as you move away from the equator

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Time

generally, older habitats have more time for speciation

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Habitat size

larger habitats have more species richness because they can usually provide a variety of resources

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Distance from other communities

the closer a community is to another community, the more species richness it will have