Niches versus neutrality: uncovering the drivers of diversity in a species-rich community
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| Authors: | Vergnon, R; Dulvy, NK; Freckleton, RP |
| Year: | 2009 |
| Journal: | Ecology Letters 12: 1079-1090 Article Link (DOI) |
| Title: | Niches versus neutrality: uncovering the drivers of diversity in a species-rich community |
| Abstract: | Ecological models suggest that high diversity can be generated by purely niche-based, purely neutral or by a mixture of niche-based and neutral ecological processes. Here, we compare the degree to which four contrasting hypotheses for coexistence, ranging from niche-based to neutral, explain species richness along a body mass niche axis. We derive predictions from these hypotheses and confront them with species body-mass patterns in a highly sampled marine phytoplankton community. We find that these patterns are consistent only with a mechanism that combines niche and neutral processes, such as the emergent neutrality mechanism. In this work, we provide the first empirical evidence that a niche-neutral model can explain niche space occupancy pattern in a natural species-rich community. We suggest this class of model may be a useful hypothesis for the generation and maintenance of species diversity in other size-structured communities. |
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