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Reconciling niche and neutrality: the continuum hypothesis
Author(s) -
Gravel Dominique,
Canham Charles D.,
Beaudet Marilou,
Messier Christian
Publication year - 2006
Publication title -
ecology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.852
H-Index - 265
eISSN - 1461-0248
pISSN - 1461-023X
DOI - 10.1111/j.1461-0248.2006.00884.x
Subject(s) - niche , neutral theory of molecular evolution , neutrality , biological dispersal , ecological niche , ecology , coexistence theory , competitive exclusion , relative abundance distribution , relative species abundance , biology , statistical physics , abundance (ecology) , physics , competition (biology) , population , sociology , law , biochemistry , demography , habitat , political science , gene
In this study, we ask if instead of being fundamentally opposed, niche and neutral theories could simply be located at the extremes of a continuum. First, we present a model of recruitment probabilities that combines both niche and neutral processes. From this model, we predict and test whether the relative importance of niche vs. neutral processes in controlling community dynamics will vary depending on community species richness, niche overlap and dispersal capabilities of species (both local and long distance). Results demonstrate that niche and neutrality form ends of a continuum from competitive to stochastic exclusion. In the absence of immigration, competitive exclusion tends to create a regular spacing of niches. However, immigration prevents the establishment of a limiting similarity. The equilibrium community consists of a set of complementary and redundant species, with their abundance determined, respectively, by the distribution of environmental conditions and the amount of immigration.