Diet and diversification in the evolution of coral reef fishes

Fabio L. Lobato, Diego R. Barneche, Alexandre C. Siqueira, Ana M. R. Liedke, Alberto Lindner, Marcio R. Pie, David R. Bellwood, Sergio R. Floeter

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)
35 Downloads (Pure)

Abstract

The disparity in species richness among evolutionary lineages is one of the oldest and most intriguing issues in evolutionary biology. Although geographical factors have been traditionally thought to promote speciation, recent studies have underscored the importance of ecological interactions as one of the main drivers of diversification. Here, we test if differences in species richness of closely related lineages match predictions based on the concept of density-dependent diversification. As radiation progresses, ecological niche-space would become increasingly saturated, resulting in fewer opportunities for speciation. To assess this hypothesis, we tested whether reef fish niche shifts toward usage of low-quality food resources (i.e. relatively low energy/protein per unit mass), such as algae, detritus, sponges and corals are accompanied by rapid net diversification. Using available molecular information, we reconstructed phylogenies of four major reef fish clades (Acanthuroidei, Chaetodontidae, Labridae and Pomacentridae) to estimate the timing of radiations of their subclades. We found that the evolution of species-rich clades was associated with a switch to low quality food in three of the four clades analyzed, which is consistent with a density-dependent model of diversification. We suggest that ecological opportunity may play an important role in understanding the diversification of reef-fish lineages.
Original languageEnglish
Article numbere102094
Pages (from-to)e102094-1-e102094-11
Number of pages11
JournalPLoS ONE
Volume9
Issue number7
DOIs
Publication statusPublished - 16 Jul 2014

Bibliographical note

Copyright the Author(s) 2014. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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