TESTING FOR ANCIENT ADAPTIVE RADIATIONS IN NEOTROPICAL CICHLID FISHES
Most contemporary studies of adaptive radiation focus on relatively recent and geographically restricted clades. It is less clear whether diversification of ancient clades spanning entire continents is consistent with adaptive radiation. We used novel fossil calibrations to generate a chronogram of...
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Published in | Evolution Vol. 67; no. 5; pp. 1321 - 1337 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
United States
Blackwell Publishing Ltd
01.05.2013
Wiley Subscription Services, Inc Oxford University Press |
Subjects | |
Online Access | Get full text |
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Summary: | Most contemporary studies of adaptive radiation focus on relatively recent and geographically restricted clades. It is less clear whether diversification of ancient clades spanning entire continents is consistent with adaptive radiation. We used novel fossil calibrations to generate a chronogram of Neotropical cichlid fishes and to test whether patterns of lineage and morphological diversification are congruent with hypothesized adaptive radiations in South and Central America. We found that diversification in the Neotropical cichlid clade and the highly diverse tribe Geophagini was consistent with diversity-dependent, early bursts of divergence followed by decreased rates of lineage accumulation. South American Geophagini underwent early rapid differentiation in body shape, expanding into novel morphological space characterized by elongate-bodied predators. Divergence in head shape attributes associated with trophic specialization evolved under strong adaptive constraints in all Neotropical cichlid clades. The South American Cichlasomatini followed patterns consistent with constant rates of morphological divergence. Although morphological diversification in South American Heroini was limited, Eocene invasion of Central American habitats was followed by convergent diversification mirroring variation observed in Geophagini. Diversification in Neotropical cichlids was influenced by the early adaptive radiation of Geophagini, which potentially limited differentiation in other cichlid clades. |
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Bibliography: | Royal Ontario Museum (HLF) istex:16C0E3420172BD355CB0729DACCA0A0E2DCA9D15 Academy of Natural Sciences of Philadelphia (HLF) ark:/67375/WNG-VFR8C0HV-F U.S. National Science Foundation (KOW, RLH, HLF) - No. DEB 0516831 ArticleID:EVO12038 National Science and Engineering Research Council of Canada (HLF) 10.5061/dryad.34621 : Data Archived: Dryad doi ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0014-3820 1558-5646 |
DOI: | 10.1111/evo.12038 |