期刊
JOURNAL OF THEORETICAL BIOLOGY
卷 248, 期 3, 页码 522-536出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jtbi.2007.06.010
关键词
biodiversity; neutral model; species abundances; allele frequencies; Ewens sampling formula; Etienne sampling formula
The neutral theory of biodiversity as put forward by Hubbell in his 2001 monograph has received much criticism for its unrealistic simplifying assumptions. These are the assumptions of functional equivalence among different species (neutrality), the assumption of point mutation speciation, and the assumption that resources are continuously saturated, such that constant resource availability implies constant community size (zero-sum assumption). Here we focus on the zero-sum assumption. We present a general theory for calculating the probability of observing a particular species-abundance distribution (sampling formula) and show that zero-sum and non-zero-sum formulations of neutral theory have exactly the same sampling formula when the community is in equilibrium. Moreover, for the nonzero-sum community the sampling formula has this same form, even out of equilibrium. Therefore, the term zero-sum multinomial (ZSM) to describe species abundance patterns, as coined by Hubbell [2001. The Unified Neutral Theory of Biodiversity and Biogeography, Princeton University Press, Princeton, NJ], is not really appropriate, as it also applies to non-zero-sum communities. Instead we propose the term dispersal-limited multinomial (DLM), thus making explicit one of the most important contributions of neutral community theory, the emphasis on dispersal limitation as a dominant factor in determining species abundances. (C) 2007 Elsevier Ltd. All rights reserved.
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