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Community diversity: relative roles of local and regional processes

R. E. Ricklefs

The species richness (diversity) of local plant and animal assemblages--biological communities--balances regional processes of species formation and geographic dispersal, which add species to communities, against processes of predation, competitive exclusion, adaptation, and stochastic variation, which may promote local extinction. During the past three decades, ecologists have sought to explain differences in local diversity by the influence of the physical environment on local interactions among species, interactions that are generally believed to limit the number of coexisting species. But diversity of the biological community often fails to converge under similar physical conditions, and local diversity bears a demonstrable dependence upon regional diversity. These observations suggest that regional and historical processes, as well as unique events and circumstances, profoundly influence local community structure. Ecologists must broaden their concepts of community processes and incorporate data from systematics, biogeography, and paleontology into analyses of ecological patterns and tests of community theory.


Science, Vol. 235, No. 4785. (09 January 1987), pp. 167-171, https://doi.org/10.1126/science.235.4785.167 
Key: INRMM:2317150

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