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Journal Article

Locomotor Capacity and Social Dominance in Male Lizards

T. Garland, Jr., E. Hankins and R. B. Huey
Functional Ecology
Vol. 4, No. 2 (1990), pp. 243-250
DOI: 10.2307/2389343
Stable URL: http://www.jstor.org/stable/2389343
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Locomotor Capacity and Social Dominance in Male Lizards
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Abstract

Physiological capacities may constrain behavioural options and hence have important ecological consequences. We tested the hypothesis that social dominance is related to capacities for locomotor performance in territorial male lizards (Sceloporus occidentalis Baird & Girard). We first measured the maximal sprint speed and stamina of individual lizards in the laboratory. Pairs of size-matched males were then placed into a novel laboratory arena and allowed to compete for access to a basking site under a heat lamp. The lizard that physically controlled the basking site was judged the `winner' of a dominance interaction (winner vs loser status was confirmed by quantitative scoring of behaviour). Winners of these dyadic encounters had significantly higher sprint speeds in 14 of 20 cases, with winners averaging 16.5% faster than losers. Stamina, however, did not differ between winners and losers.

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