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Neutral theory in community ecology

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Frontiers of Biology in China

Abstract

One of the central goals of community ecology is to understand the forces that maintain species diversity within communities. The traditional niche-assembly theory asserts that species live together in a community only when they differ from one another in resource uses. But this theory has some difficulties in explaining the diversity often observed in specie-rich communities such as tropical forests. As an alternative to the niche theory, Hubbell and other ecologists introduced a neutral model. Hubbell argues that the number of species in a community is controlled by species extinction and immigration or speciation of new species. Assuming that all individuals of all species in a trophically similar community are ecologically equivalent, Hubbell’s neutral theory predicts two important statistical distributions. One is the asymptotic log-series distribution for the metacommunities under point mutation speciation, and the other is the zero-sum multinomial distribution for both local communities under dispersal limitation and metacommunities under random fission speciation. Unlike the niche-assembly theory, the neutral theory takes similarity in species and individuals as a starting point for investigating species diversity. Based on the fundamental processes of birth, death, dispersal and speciation, the neutral theory provided the first mechanistic explanation of species abundance distribution commonly observed in natural communities. Since the publication of the neutral theory, there has been much discussion about it, pro and con. In this paper, we summarize recent progress in the assumption, prediction and speciation mode of the neutral theory, including progress in the theory itself, tests about the assumption of the theory, prediction and speciation mode at the metacommunity level. We also suggest that the most important task in the future is to bridge the niche-assembly theory and the neutral theory, and to add species differences to the neutral theory and more stochasticity to the niche theory.

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Authors and Affiliations

  1. MOE Key Lab for Biodiversity Science & Ecological Engineering, Beijing Normal University, Beijing, 100875, China

    Shurong Zhou & Dayong Zhang

  2. Laboratory of Arid Agroecology, Lanzhou University, Lanzhou, 730000, China

    Shurong Zhou

Authors
  1. Shurong Zhou
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  2. Dayong Zhang
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Correspondence to Dayong Zhang.

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Translated from Journal of Plant Ecology, 2006, 30(5): 868–877 [译自:植物生态学报]

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Zhou, S., Zhang, D. Neutral theory in community ecology. Front. Biol. China 3, 1–8 (2008). https://doi.org/10.1007/s11515-008-0008-z

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