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Feeding Ecology of the Lizard, Uta stansburiana, in Southeastern New Mexico

Troy L. Best and A. L. Gennaro
Journal of Herpetology
Vol. 18, No. 3 (Sep., 1984), pp. 291-301
DOI: 10.2307/1564083
Stable URL: http://www.jstor.org/stable/1564083
Page Count: 11
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Feeding Ecology of the Lizard, Uta stansburiana, in Southeastern New Mexico
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Abstract

This study presents the first food habit assessment for the side-blotched lizard (Utastansburiana) in the shinnery oak-mesquite habitat (Quercus havardii-Prosopis glandulosa) of southeastern New Mexico. Ants, beetles, true bugs, grasshoppers, and spiders formed the major portion of the diet during the four year study. Discriminant analyses revealed the existence of annual, seasonal (monthly), and sexual variation. Variables separating years were incidental in occurrence; the major food categories occurred consistently between years. Seasonal variation was attributed to temporary changes in abundance of arthropods through the growing season. Sexual variation was pronounced in most samples and may be related to sexual size dimorphism or to behavioral differences related to defense of territories and attraction of mates. The sexual differences in diet may act to reduce intraspecific competition for food resources.

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