13 



25. Bowker, R. G. 1980. Sound production in Cnemidophorus gularis . 

 JOURNAL OF HERPETOLOGY lM2): 187-188. 



Laboratory studies show that lizards when disturbed emit a short, 

 monosyllabic squeak that can be heard by the teiid ear. A sonagram is 

 presented. 



26. — . and O. W. Johnson. 1980. Thermoregulatory precision in 3 

 species of whiptail lizards (Lacertilia: Teiidae). PHYSIOLOGICAL 

 ZOOLOGY 53(2): 176-185. 



Field and laboratory data are presented for Cnemidophorus gularis 

 gularis , C. inornatus and C. uniparens . Mean body temperatures measured 

 in the field were not significantly different between species; however, 

 _C. uniparens had the highest value yet was collected under the coldest 

 field conditions. _C. inornatus had the intermediate value yet was col- 

 lected under the hottest field conditions. C. gularis had the lowest 

 value yet was collected under hotter field conditions than C. uniparens . 

 Mean body temperatures measured in artificial thermal gradients were not 

 significantly different between species; _C. uniparens >_C. gularis > _C. 

 inornatus . Thermoregulatory behavior is described and heating and cool- 

 ing rates given for each species. Lizards heat faster than they cool. 

 Precise control of body temperature is achieved by shuttling back and 

 forth from warm to cool areas in the thermal gradients. _C. uniparens 

 is significantly more precise than the other two species; this implies 

 that it spends more time thermoregulating. Behavior is shown to be very 

 important in thermoregulation. Field studies of thermoregulation are 

 suggested. 



27. Brackin, M. F. 1978. The relation of rank to physiological state 

 in Cnemidophorus sexlineatus dominance hierarchies. HERP. 35: 185-191. 



Laboratory studies of lizards from Oklahoma show that rank is 

 closely related to body weight and aggressiveness. High-ranking males 

 readily tried to mate with females whereas low-ranking males did not; 

 this behavior was directly proportional to testicular condition. Feed- 

 ing behavior and nutritive condition were not related to rank; adrenal 

 volume was inversely proportional to rank. The significance of these 

 finding to individual fitness in wild populations requires further 

 study. 



28. — . 1979. The seasonal reproductive, fat body, and adrenal 

 cycles of male Six-lined Racerunners (Cnemidophorus sexlineatus ) in 

 central Oklahoma. HERPETOLOGICA 35(3): 216-222. 



The breeding season begins in late May; testes are hypertrophic 



