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      Ecological determinism increases with organism size

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          Global dispersal of free-living microbial eukaryote species.

          The abundance of individuals in microbial species is so large that dispersal is rarely (if ever) restricted by geographical barriers. This "ubiquitous" dispersal requires an alternative view of the scale and dynamics of biodiversity at the microbial level, wherein global species number is relatively low and local species richness is always sufficient to drive ecosystem functions.
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            NULL MODEL ANALYSIS OF SPECIES CO-OCCURRENCE PATTERNS

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              A niche for neutrality.

              Ecologists now recognize that controversy over the relative importance of niches and neutrality cannot be resolved by analyzing species abundance patterns. Here, we use classical coexistence theory to reframe the debate in terms of stabilizing mechanisms (niches) and fitness equivalence (neutrality). The neutral model is a special case where stabilizing mechanisms are absent and species have equivalent fitness. Instead of asking whether niches or neutral processes structure communities, we advocate determining the degree to which observed diversity reflects strong stabilizing mechanisms overcoming large fitness differences or weak stabilization operating on species of similar fitness. To answer this question, we propose combining data on per capita growth rates with models to: (i) quantify the strength of stabilizing processes; (ii) quantify fitness inequality and compare it with stabilization; and (iii) manipulate frequency dependence in growth to test the consequences of stabilization and fitness equivalence for coexistence.
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                Author and article information

                Journal
                Ecology
                Ecology
                Wiley-Blackwell
                0012-9658
                July 2012
                July 2012
                : 93
                : 7
                : 1752-1759
                Article
                10.1890/11-1144.1
                22919920
                dd3db1a9-6023-4b92-9f76-d10b9f680a0b
                © 2012

                http://doi.wiley.com/10.1002/tdm_license_1.1

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