Beta-diversity in tropical forest trees

Richard Condit, Nigel Pitman, Egbert G. Leigh, Jérôme Chave, John Terborgh, Robin B. Foster, Percy V. Núñez, Salomón Aguilar, Renato Valencia, Gorky Villa, Helene C. Muller-Landau, Elizabeth Losos, Stephen P. Hubbell

Research output: Contribution to journalArticlepeer-review

1105 Scopus citations


The high alpha-diversity of tropical forests has been amply documented, but beta-diversity - how species composition changes with distance - has seldom been studied. We present quantitative estimates of beta-diversity for tropical trees by comparing species composition of plots in lowland terra firme forest in Panama, Ecuador, and Peru. We compare observations with predictions derived from a neutral model in which habitat is uniform and only dispersal and speciation influence species turnover. We find that beta-diversity is higher in Panama than in western Amazonia and that patterns in both areas are inconsistent with the neutral model. In Panama, habitat variation appears to increase species turnover relative to Amazonia, where unexpectedly low turnover over great distances suggests that population densities of some species are bounded by as yet unidentified processes. At intermediate scales in both regions, observations can be matched by theory, suggesting that dispersal limitation, with speciation, influences species turnover.

Original languageEnglish
Pages (from-to)666-669
Number of pages4
Issue number5555
StatePublished - 25 Jan 2002
Externally publishedYes


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