On the implications of species-area relationships for endemism, spatial turnover, and food web patterns

J. Harte, A. P. Kinzig

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Abstract

Consequences of species-area relationships (SARs) of the form S = cA(z) are derived. One consequence is an endemics-area relationship (EAR); it is of the same power-law form as the SAR but with an exponent z' that is a function only of z and that always exceeds unity. An explicit formula is derived for the dependence of species turnover in space on census plot size, interplot distance, and the SAR exponent z; this formula can be used to determine z over spatial scales that are too large to permit direct estimate of z by censusing of nested patches. The areal dependence of link-species patterns observed in food webs is also examined; SARs are shown to imply the approximate, but not exact, area-independence of link-species relationships of the form L = kS(y), where L is the number of trophic links and y ≤ 2. A relationship between the average range of species in a habitat patch and the exponent z is also derived, leading to the result that average range is a decreasing function of both patch area and z.

Original languageEnglish (US)
Pages (from-to)417-427
Number of pages11
JournalOikos
Volume80
Issue number3
DOIs
StatePublished - Dec 1997
Externally publishedYes

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ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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