منابع مشابه
What Ecological Factors Shape Species-Area Curves in Neutral Models?
Understanding factors that shape biodiversity and species coexistence across scales is of utmost importance in ecology, both theoretically and for conservation policies. Species-area relationships (SARs), measuring how the number of observed species increases upon enlarging the sampled area, constitute a convenient tool for quantifying the spatial structure of biodiversity. While general featur...
متن کاملSpecies-area curves, neutral models, and long-distance dispersal.
We simulate species-area curves (SACs) using a spatially explicit neutral model. These display three distinct phases with the central phase being well approximated by a "power law" where species richness (S) is related to area (A) by S = cA(z). If seeds are normally distributed in space about their parent, the power law phase of the SAC is unrealistically narrow, and implausibly large speciatio...
متن کاملAn evolutionary slant on species-area curves.
Uncertainty about the past has made it difficult to evaluate the relative roles of ecological and historical processes in generating species diversity. Although diversity is predicted to be higher on larger islands compared with that on smaller islands because of the effect of area on immigration and extinction rates, ecological theories do not fully account for positive species–area relationsh...
متن کاملSpecies-area curves, spatial aggregation, and habitat specialization in tropical forests.
The relationship between species diversity and sampled area is fundamental to ecology. Traditionally, theories of the species-area relationship have been dominated by random-placement models. Such models were used to formulate the canonical theory of species-area curves and species abundances. In this paper, however, armed with a detailed data set from a moist tropical forest, we investigate th...
متن کاملClimate change, species-area curves and the extinction crisis.
An article published in the journal Nature in January 2004-in which an international team of biologists predicted that climate change would, by 2050, doom 15-37% of the earth's species to extinction-attracted unprecedented, worldwide media attention. The predictions conflict with the conventional wisdom that habitat change and modification are the most important causes of current and future ext...
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ژورنال
عنوان ژورنال: Journal of Theoretical Biology
سال: 1996
ISSN: 0022-5193
DOI: 10.1006/jtbi.1996.0053