Cooperation among species tends to result in mutualistic networks with a nested structure, which is thought to increase biodiversity and persistence but may be less stable than unstructured networks: here nested networks are shown to result from a mechanism that maximizes species abundances in mutualistic communities, and the abundance of nested species is found to be directly linked to the resilience of the community.
Emergence of structural and dynamical properties of ecological mutualistic networks
Samir Suweis, Filippo Simini, Jayanth R. Banavar & Amos Maritan
Nature 500, 449–452 (22 August 2013) http://dx.doi.org/10.1038/nature12438
Via Complexity Digest