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American Zoologist 1974 14(4):1127-1136; doi:10.1093/icb/14.4.1127
© 1974 by The Society for Integrative and Comparative Biology
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Ecological Character Displacement in a Lizard

RAYMOND B. HUEY
Museum of Comparative Zoology, Harvard University Cambridge, Massachusetts 02138

Two species of subterranean skinks (Typhlosaurus) are sympatric in part of the southern Kalahari Desert. The geographic range of the smaller species (T. gariepensis) is entirely included within that of the larger one (T. lineatus). Snout-vent lengths, head dimensions, proportional head lengths, and prey size of T. lineatus are larger in sympatry than in allopatry. Morphological and dietary evidence support the hypothesis that behavioral and morphological character displacement has occurred in female and immature T. lineatus, which reduces dietary overlap with T. gariepensis. Dietary data for male T. lineatus may be conflicting.


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