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Island Biogeography

  • Extreme impoverishment of isolated islands indicates distance limits

successful colonization

  • Supported by observation that successful colonists have special features

allowing for long distance dispersal

Island Biogeography

  • recolonization from Sumatra and Java; extensive data collected on

species composition ever since

Island Biogeography

3. Species turnover - islands have higher species turnover than continental mainlands

  • 125 years of Krakatau recolonization

Island Biogeography

  • by the 1930s a tropical forest had developed

  • number of bird species increased until 1920, then has remained fairly

constant despite changes in avifauna

  • some later colonists were successful, replacing about same number of bird

species that went “extinct”

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