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MORPHOLOGICAL DIVERSIFICATION AND ADAPTIVE RADIATION: A COMPARISON OF TWO DIVERSE LIZARD CLADES
Author(s) -
Warheit Kenneth I.,
Forman Jonathan D.,
Losos Jonathan B.,
Miles Donald B.
Publication year - 1999
Publication title -
evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.84
H-Index - 199
eISSN - 1558-5646
pISSN - 0014-3820
DOI - 10.1111/j.1558-5646.1999.tb04535.x
Subject(s) - anolis , biology , adaptive radiation , lizard , clade , iguanidae , monophyly , diversification (marketing strategy) , sauria , ecology , adaptation (eye) , subtropics , evolutionary biology , zoology , phylogenetics , biochemistry , business , marketing , neuroscience , gene
We compared the morphological diversity (i.e., the amount of morphological space occupied) of two similar clades, the lizard genera Anolis and Sceloporus . These species‐rich monophyletic clades are similar in body size, age of origin, and many aspects of their natural history. We examined a number of morphological traits whose variation is likely to represent adaptation to different aspects of the environment, including body size, limb proportions, head dimensions, and tail length. Examination of the position of species in multidimensional space, based on a principal components analysis, indicates that the morphological diversity of Anolis , which we refer to as disparity, is significantly greater than that of Sceloporus . One potential explanation for this pattern is that morphological diversification in Anolis was facilitated by the evolution of subdigital toe‐pads, which allow anoles to use the environment in ways not available to Sceloporus . The geographic location of diversification (tropical and subtropical for Anolis , arid for Sceloporus ) may also have been important.