Density dependence explains tree species abundance and diversity in tropical forests.

Abstract:

:The recurrent patterns in the commonness and rarity of species in ecological communities--the relative species abundance--have puzzled ecologists for more than half a century. Here we show that the framework of the current neutral theory in ecology can easily be generalized to incorporate symmetric density dependence. We can calculate precisely the strength of the rare-species advantage that is needed to explain a given RSA distribution. Previously, we demonstrated that a mechanism of dispersal limitation also fits RSA data well. Here we compare fits of the dispersal and density-dependence mechanisms for empirical RSA data on tree species in six New and Old World tropical forests and show that both mechanisms offer sufficient and independent explanations. We suggest that RSA data cannot by themselves be used to discriminate among these explanations of RSA patterns--empirical studies will be required to determine whether RSA patterns are due to one or the other mechanism, or to some combination of both.

journal_name

Nature

journal_title

Nature

authors

Volkov I,Banavar JR,He F,Hubbell SP,Maritan A

doi

10.1038/nature04030

keywords:

subject

Has Abstract

pub_date

2005-12-01 00:00:00

pages

658-61

issue

7068

eissn

0028-0836

issn

1476-4687

pii

nature04030

journal_volume

438

pub_type

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