Date of Award:


Document Type:


Degree Name:

Master of Science (MS)




James A. MacMahon


The feeding habits and reproduction of Utastansburiana, Crotaphytus collaris and Cnemidophorus tigris during spring and summer 1976 are described. Feeding habits are expressed in percent total number and volume of prey items and frequency of occurrence of each prey category . Importance Values are also calculated. These values better i llustrate the feeding habits of the lizard species than either percent total number and volume and frequency of prey category occurrence.

Lizards consume a variety of food items throughout the growing season. Hymenoptera, Coleoptera, Orthoptera and Arachnida are the major prey categories of Q. s t ansburiana . The major prey categories of C. collaris and C. tigris are Orthoptera, Hymenoptera and Coleoptera and Orthoptera, Lepidoptera, Coleoptera, and Arachnida, respectively.

Dietary overlap between species and food species diversities (numbers and volume) are also used to illustrate the feeding habits. Reproduction is assessed by clutch size and frequency . Clutch size of Q. stansburiana , f· collaris and f· tigris is 2.99, 5.38 and 3.07, respectively. All species laid one clutch of eggs in 1976.

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