Behavior as a Tool for Welfare Improvement and Conservation Management in the Endangered Lizard (Gallotia bravoana)

The study assessed the behavior of Gallotia bravoana (La Gomera, Canary Islands, one of the world’s most threatened reptiles) to facilitate management decisions and improve welfare during initial stages of a species’ recovery plan. The study analyzed–and remote-controlled video cameras filmed-the behavior of lizards housed in 3 outdoor enclosures, from May to September 2000. Daily […]

Rapid solving of a problem apparatus by juvenile black-throated monitor lizards (Varanus albigularis albigularis)

It is widely accepted that providing stimulus enrichment is an important part of the development and maintenance of behavior and well being in mammals. However, extending this idea to non-avian reptiles has barely been explored, certainly as an aid to cognitive development. Monitor lizards have a reputation for being highly curious and intelligent lizards, but […]

Of tongues and noses: chemoreception in lizards and snakes

Lizards and snakes inhabit a world so richly textured in chemical information that, as primates, we can only imagine it. Subtle nuances of chemical shading underline nearly every fundamental activity of their lives, from finding foot to finding mates. Recent work examines the nature of these chemical messages, mechanisms for their perception, the interplay of […]

Comparison of chemosensory behavior and prey trail-following in the varanoid lizards Varanus gouldii and Heloderma suspectum

Abstract 10.1002/(SICI)1098-2361(1996)15:33.3.CO;2-C In the first of three experiments, Gould’s monitor lizards Varanus gouldii (n = 8) and Gila monsters Heloderma suspectum (n = 8) were tested to determine whether a postingestion elevation in tongue-flick rate (PETF) occurred. Based on analysis of numbers of tongue-flicks during 20 successive minutes following treatments and controls, significant PETF was […]

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 […]

Plasma corticosterone levels in the male iguanid lizard Sceloporus cyanogenys under various physiological conditions

Variations in peripheral plasma corticosterone levels in male iguanid lizards, Sceloporus cyanogenys, were investigated under varying physiological conditions. Control baseline levels of the steroid in plasma were significantly decreased by hypophysectomy, adrenalectomy, hypothalamic lesions, and cyanoketone, an inhibitor of Δ5-3β hydroxysteroid dehydrogenase. Levels were increased following treatment with mammalian ACTH in both intact and hypophysectomized […]

Social status, gonadal state, and the adrenal stress response in the lizard, Anolis carolinensis

Adult males of the small arboreal iguanid lizard, Anolis carolinensis, form social dominance hierarchies when placed in habitats with limited resources. Skin color changes occur during hierarchy formation, most conspicuously in subordinates, who appear darker (more brown) than dominants (more green). Because skin color in this species is under the control of hormones frequently associated […]

Chronic low humidity-stress in the lizard Anolis carolinensis: changes in diurnal corticosterone rhythms

Plasma corticosterone levels of female lizards (Anolis carolinensis) were sampled at 4-h intervals before and after a photothermal regimen known to stimulate ovarian growth in January and February, respectively. Female A. carolinensis have a diurnal cycle in plasma corticosterone with a daily peak at 1700 h in lizards with unstimulated ovaries exposed to short photophase […]

Behavioral endocrinology of physiological stress in a lizard

Reptiles provide us with important information about alternative tactics for solving specific problems of survival. Further, as the contemporary representatives of the evolutionary precursors of our own species, this information tells us much about the constraints upon and possibilities of our own biology. Several aspects of the manner in which physiological and environmental variables are […]

Seasonal and interpopulational variation in plasma levels of corticosterone in the side-blotched lizard (Uta stansburiana)

We examine seasonal and interpopulational variation in field levels of corticosterone (B) in the lizard Uta stansburiana. Corticosterone is the primary reptilian glucocorticosteroid, and elevated levels of this hormone have been correlated with physiological stress under both field and laboratory conditions. Patterns of seasonal variation in plasma B were generally similar in males and females, […]