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Science 15 August 2003:
Vol. 301. no. 5635, pp. 961 - 964
DOI: 10.1126/science.1084786
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Reports

Tempo and Mode of Evolutionary Radiation in Iguanian Lizards

Luke J. Harmon,* James A. Schulte, II,{dagger} Allan Larson, Jonathan B. Losos

Identification of general properties of evolutionary radiations has been hindered by the lack of a general statistical and phylogenetic approach applicable across diverse taxa. We present a comparative analytical framework for examining phylogenetic patterns of diversification and morphological disparity with data from four iguanian-lizard taxa that exhibit substantially different patterns of evolution. Taxa whose diversification occurred disproportionately early in their evolutionary history partition more of their morphological disparity among, rather than within, subclades. This inverse relationship between timing of diversification and morphological disparity within subclades may be a general feature that transcends the historically contingent properties of different evolutionary radiations.

Department of Biology, Campus Box 1137, Washington University, St. Louis, MO 63130–4899, USA.



{dagger} Present address: Division of Amphibians and Reptiles, Post Office Box 37012, MRC 162, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013–7012, USA.

* To whom correspondence should be addressed. E-mail: harmon{at}biology.wustl.edu

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