You are not currently logged in.
Access your personal account or get JSTOR access through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
On the Implications of Species-Area Relationships for Endemism, Spatial Turnover, and Food Web Patterns
J. Harte and A. P. Kinzig
Vol. 80, No. 3 (Dec., 1997), pp. 417-427
Stable URL: http://www.jstor.org/stable/3546614
Page Count: 11
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
Consequences of species-area relationships (SARs) of the form S=cAz 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=kSy, 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.
Oikos © 1997 Nordic Society Oikos