Effects of an adaptive zone shift on morphological and ecological diversification in terapontid fishes

Davis, Aaron M., Unmack, Peter J., Pusey, Bradley J., Pearson, Richard G., and Morgan, David L. (2014) Effects of an adaptive zone shift on morphological and ecological diversification in terapontid fishes. Evolutionary Ecology, 28 (2). pp. 205-227.

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Abstract

A fundamental goal of evolutionary ecology is understanding the processes responsible for contemporary patterns of morphological diversity and species richness. Transitions across the marine-freshwater interface are regarded as key triggers for adaptive radiation of many clades. Using the Australian terapontid fish family as a model system we employed phylogenetic analyses to compare the rates of ecological (dietary) and morphological evolution between marine and freshwater species of the family. Results suggested significantly higher rates of phenotypic evolution in key dietary and morphological characters in freshwater species compared to marine counterparts. Moreover, there was significant correlation between several of these dietary and morphological characters, suggesting an underlying ecomorphological aspect to these greater rates of phenotypic evolution in freshwater clades. Australia's biogeographic history, which has precluded colonisation by many of the major ostariophysan fish families that make up much global freshwater fish diversity, appears to have provided the requisite 'ecological opportunity' to facilitate the radiation of invading marine-derived fish clades.

Item ID: 32914
Item Type: Article (Research - C1)
ISSN: 1573-8477
Keywords: dietary radiation, morphological disparity, marine-freshwater transition, trophic ecology, ecomorphology
Funders: Natural Heritage Trust National Competitive Component, Australian Government, Land and Water Australia, W. M. Keck Foundation, R. M. Parsons Foundation, Natural History Museum of Los Angeles County, National Evolutionary Synthesis Center , National Science Foundation (NSF), USA
Projects and Grants: NSF #EF-0905606
Date Deposited: 30 Apr 2014 09:55
FoR Codes: 06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060309 Phylogeny and Comparative Analysis @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960805 Flora, Fauna and Biodiversity at Regional or Larger Scales @ 100%
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