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Science. 2006 Apr 21;312(5772):431-3.

Asymmetric coevolutionary networks facilitate biodiversity maintenance.

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1
Integrative Ecology Group, Estaciòn Biològica de Doñana, Consejo Superior de Investigaciones Cientìficas, Apartado 1056, E-41080 Sevilla, Spain. bascompte@ebd.csic.es

Abstract

The mutualistic interactions between plants and their pollinators or seed dispersers have played a major role in the maintenance of Earth's biodiversity. To investigate how coevolutionary interactions are shaped within species-rich communities, we characterized the architecture of an array of quantitative, mutualistic networks spanning a broad geographic range. These coevolutionary networks are highly asymmetric, so that if a plant species depends strongly on an animal species, the animal depends weakly on the plant. By using a simple dynamical model, we showed that asymmetries inherent in coevolutionary networks may enhance long-term coexistence and facilitate biodiversity maintenance.

PMID:
16627742
DOI:
10.1126/science.1123412
[Indexed for MEDLINE]
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