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Convergent evolution of lizard toe fringes
Claudia Luke,
Claudia Luke
Museum of Vertebrate Zoology, University of California, Berkeley, California 94720, U.S.A.
Search for more papers by this authorClaudia Luke,
Claudia Luke
Museum of Vertebrate Zoology, University of California, Berkeley, California 94720, U.S.A.
Search for more papers by this authorAbstract
Lizard toe fringes are composed of laterally projecting elongated scales and have arisen independently at least 26 times in seven families of lizards. Four different fringe types are identified: triangular, projectional, conical and rectangular. To determine if variation in fringe morphology can be attributed to environmental differences, each independent evolution of a fringe type is identified; correlation of substrate types with evolutionary independent fringe morphologies are then studied. Variation in fringe morphology shows a strong association with substrate type: triangular, projectional and conical fringes with windblown sand; and rectangular fringes with water. Some aspects of fringe morphology may result from differences in functional requirements, and others may have no adaptive significance. This example of convergent evolution points out difficulties inherent to comparative studies of adaptation and underscores the value of broad comparative surveys which provide an alternative to ad hoc adaptive explanations of similarity.
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