Species Turnover Rates on Islands: Dependence on Census Interval
- 15 July 1977
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 197 (4300) , 266-270
- https://doi.org/10.1126/science.197.4300.266
Abstract
Measurements of species turnover in island bird communities demonstrate two trends with increasing census interval t: (i) Apparent turnover rates T decrease greatly with t, and (ii) the coefficient of variation of T decreases asymptotically to a constant value. These effects are predicted by a statistical model whose parameters are the immigration and extinction probabilities of each species. Available bird censuses at intervals of decades underestimate turnover rates by about an order of magnitude.Keywords
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