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Vesmír č. 10
Vesmír č. 10
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2. 10. 2017
Novinky
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O převaze vzácnosti v přírodě

Why species are rather scarce then abundant by David Storch and Arnošt Šizling:

The distribution of species abundances has been traditionally considered to be lognormal, generated by some random multiplicative process, comprising for instance unequal random division of resources among species. However, we have shown that the lognormal distribution cannot universally apply across spatial scales. Moreover, the observed shape of the distribution at particular spatial scale can be attributed to the process of splicing from the distribution occurring at smaller scales, given that there is spatial turnover in species composition between neighbouring plots, and that species abundances are spatially autocorrelated. The distribution of species populationsizes thus results from the fact that landscape is heterogeneous and there are limits of population dispersal.