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dc.contributor.authorCarroll, Ian T.  Concept link
dc.contributor.authorNisbet, Roger M.  Concept link
dc.identifier.citationTheoretical Ecology 8 (2015): 449-465en_US
dc.description© The Author(s), 2015. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Theoretical Ecology 8 (2015): 449-465, doi:10.1007/s12080-015-0261-0.en_US
dc.description.abstractBreaking the core assumption of ecological equivalence in Hubbell’s “neutral theory of biodiversity” requires a theory of species differences. In one framework for characterizing differences between competing species, non-neutral interactions are said to involve both niche differences, which promote stable coexistence, and relative fitness differences, which promote competitive exclusion. We include both in a stochastic community model in order to determine if relative fitness differences compensate for changes in community structure and dynamics induced by niche differences, possibly explaining neutral theory’s apparent success. We show that species abundance distributions are sensitive to both niche and relative fitness differences, but that certain combinations of differences result in abundance distributions that are indistinguishable from the neutral case. In contrast, the distribution of species’ lifetimes, or the time between speciation and extinction, differs under all combinations of niche and relative fitness differences. The results from our model experiment are inconsistent with the hypothesis of “emergent neutrality” and support instead a hypothesis that relative fitness differences counteract effects of niche differences on distributions of abundance. However, an even more developed theory of interspecific variation appears necessary to explain the diversity and structure of non-neutral communities.en_US
dc.description.sponsorshipThe research was funded by NSF grant ECCS-0835847 and a postdoctoral scholarship from the Woods Hole Oceanographic Institution.en_US
dc.rightsAttribution 4.0 International*
dc.subjectNeutral theoryen_US
dc.subjectNiche differenceen_US
dc.subjectRelative fitness differenceen_US
dc.subjectDemographic stochasticityen_US
dc.subjectSpecies abundance distributionen_US
dc.titleDepartures from neutrality induced by niche and relative fitness differencesen_US

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Attribution 4.0 International
Except where otherwise noted, this item's license is described as Attribution 4.0 International