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Island Biogeography

Three interrelated ecological and biogeographical patterns seen on islands

Island Biogeography

  • Darlington’s species area relationship - increase island size 10X to get

2X number of species

line has slope ‘z’

Anolis

Relationship between number of species (S) and island area (A) for reptiles and amphibians of the West Indies (Darlington 1957)

S = CAz

logS = C + zlogA

Island Biogeography

1. Species-area relationships - relationship within archipelagos between the sizes of individual islands and the number of species that comprise their biota

  • de Candolle recognized that larger islands contain more species than

small islands

  • Philip Darlington

quantified this relationship with the herptofauna of the West Indies

Island Biogeography

  • Similar patterns are seen in Pacific islands for angiosperm and bird

genera

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