Sex differences in adrenal function in the lizard Cnemidophorus sexlineatus: II. Responses to acute stress in the laboratory
Circulating concentrations of plasma corticosterone and gonadal steroids were measured intact and gonadectomized male and female lizards (Cnemidophorus sexlineatus) following acute stress (handling) in the laboratory. There was a significant increase in plasma corticosterone after stress. Whereas intact females exhibited greater concentrations of corticosterone relative to intact males, ovariectomized females exhibited lower concentrations of corticosterone […]
The relation of rank to physiological state in Cnemidophorus sexlineatus dominance hierarchies
The six-lined racerunner, Cnemidophorus sexlineatus, maintains dominance hierarchies in captivity. Trios of ♂ ♂ were observed to determine the relation of hierarchy rank to physiological state and behavior. Rank was closely related to body weight and aggressiveness. High ranking ♂ ♂, unlike low ranking ♂ ♂, readily tried to mate with ♀ ♀. Anatomical examination […]