Jul 26, 2003

The nested assembly of plant-animal mutualistic networks

Proceedings of the National Academy of Sciences of the United States of America
Jordi BascompteJens M Olesen

Abstract

Most studies of plant-animal mutualisms involve a small number of species. There is almost no information on the structural organization of species-rich mutualistic networks despite its potential importance for the maintenance of diversity. Here we analyze 52 mutualistic networks and show that they are highly nested; that is, the more specialist species interact only with proper subsets of those species interacting with the more generalists. This assembly pattern generates highly asymmetrical interactions and organizes the community cohesively around a central core of interactions. Thus, mutualistic networks are neither randomly assembled nor organized in compartments arising from tight, parallel specialization. Furthermore, nestedness increases with the complexity (number of interactions) of the network: for a given number of species, communities with more interactions are significantly more nested. Our results indicate a nonrandom pattern of community organization that may be relevant for our understanding of the organization and persistence of biodiversity.

  • References7
  • Citations450

References

Mentioned in this Paper

Host-Parasite Interactions
Theoretical Study
Climate
Bionomics
Morphogenesis
Anatomical Compartments
Central Cores
Metazoa
Biological Evolution
Neomalthusianism

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