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We investigate how the pattern of contacts between species in mutualisticecosystems is affected by the phylogenetic proximity between the species ofeach guild. We develop a dynamical model geared to establish the role of suchproximity in the emergence of a nested pattern of contacts. We also define aparameter that provides a direct measure of the influence of phylogeneticproximity in a given pattern of contacts. We conclude that althoughphylogenetic proximity is compatible with nestedness it can not be claimed tobe a cause of it. We find that nestedness can instead be attributed to ageneral rule by which species tend to hold contacts with counterparts thatalready have a large number of contacts. If the phylogenetic structure of bothguilds is brought into the analysis, this rule is equivalent to maximize thephylogenetic diversity of the mutualistic counterparts of species of eitherguild.

Does Phylogenetic Proximity Explain Nestedness in Mutualistic Ecosystems?