Biodiversity

AP Biology· difficulty 3/5

log(Area) log(Species)

The species-area curve shown predicts that doubling island area will:

  • A

    Increase species number, but less than double (S = cA^z, z<1)

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  • B

    Reduce species number due to competition

  • C

    Triple the species number

  • D

    Double the species number exactly

Explanation

Empirical species-area relationships fit S = cA^z with z usually 0.2-0.35; species number rises with area but with diminishing returns.

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