Biology of Desert Amphibians and Reptiles

Mayhew, Wilbur W.

doi:10.1016/b978-1-4831-9868-2.50014-1

Cited by 64 publications

(36 citation statements)

References 463 publications

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“…We have observed brightly colored females copulating in southern Nevada, as has been observed elsewhere (Montanucci, 1965;and Mayhew, 1968) (Turner et al, 1972), --and this appeared to be the basis of female sterility. It was possible, however, that undetected ovarian tissue remained and that the sterility was due to some more proximal failure, e.s., in pituitary function.…”

Section: Ek T IIIsupporting

confidence: 62%

“…Other authors have speculated as to the functional significance of the red-orange coloration of female 2. wislizenii during the breeding season (Montanucci, 1965;Fitch, 1967;and Mayhew, 1968). We have observed brightly colored females copulating in southern Nevada, as has been observed elsewhere (Montanucci, 1965;and Mayhew, 1968) (Turner et al, 1972), --and this appeared to be the basis of female sterility.…”

Section: Ek T IIIsupporting

confidence: 49%

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Hormonal Induction of Color Change in Female Leopard Lizards, Crotaphytus wislizenii

Medica¹,

Turner²,

Smith³

1973

Copeia

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Section: Ek T IIIsupporting

confidence: 62%

Section: Ek T IIIsupporting

confidence: 49%

Hormonal Induction of Color Change in Female Leopard Lizards, Crotaphytus wislizenii

Medica¹,

Turner²,

Smith³

1973

Copeia

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“…This movement included changing the orientation of the body towards the sun and moving more of the body into or out of the sun as required. These and other behaviours of P. macdonnellensis have much in common with those used by desert-dwelling ectotherms, including the frequency of basking on sun-exposed rock early in the morning, use of adjacent rock crevices for refuge, adjusting body posture in relation to solar radiation, and increased duration of basking bouts early in the day (Mayhew 1968;Nagy 1973;Carrascal et al 1992). Further, most P. macdonnellensis commenced diurnal foraging after passive rewarming by basking, as do desert ectotherms (Huey and Pianka 1977;Cooper 2000).…”

Section: Discussionmentioning

confidence: 99%

Basking and diurnal foraging in the dasyurid marsupial Pseudantechinus macdonnellensis

Pavey

Geiser

2008

Aust. J. Zool.

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Abstract. Several mammal species bask to passively rewarm during arousal from torpor, a strategy that can decrease energetic costs. Nothing is known about basking behaviour in these species or the trade-offs between energetic benefits of basking and potential costs associated with changes in activity patterns and increased predation risk. We assessed basking during winter in Pseudantechinus macdonnellensis, an Australian arid-zone marsupial that belongs to a family (Dasyuridae) that is typically nocturnal. Animals were implanted with temperature-sensitive transmitters to assess body temperatures and to assist in visually locating animals active during the day. Tagged animals regularly exhibited diurnal foraging. Foraging bouts occurred throughout the day; however, most bouts were observed within 3 h of sunset. By comparison, basking occurred much more frequently in the morning. Basking and a shift towards diurnal foraging in winter is associated with a decrease in richness and abundance of predators. P. macdonnellensis appears to compensate for the occurrence of torpor during the active phase (i.e. night) in winter by changing activity patterns such that foraging commences during what is usually the rest phase. These activity patterns are not expected to occur during the remainder of the year.

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“…Norris (1953) reported a mean field temperature of 42.1 ~ C and Mayhew 20* (1968) found that 75% of the Dipsosaurus sampled in their natural habitat had body temperatures of 40~ or higher. Body temperatures as high as 47 ~ C have been observed in this species under field conditions (Mayhew, 1968), the highest value reported for any reptile and among the highest for all vertebrates.…”

Section: Introductionmentioning

confidence: 88%

“…Considerable information has been collected on the physiology and ecology of Dipsosaurus dorsalis, the desert crested iguana (see, for example, Cook, 1949;Norris, 1953 ;Dawson and Bartholomew, 1958 ;Dawson and Poulson, 1962;DoWitt, 1963DoWitt, , 1967aMoborly, 1963;Licht, 1965;Mayhew, 1965aMayhew, , 1968Mayhew, , 1971Weathers, 1970;Minnich, 1970a, b;Minnich and Shoemaker, 1970;Beckman et al, 1971). This lizard is a relatively common herbivore in deserts in parts of California, Arizona, Nevada, Utah, and northern Mexico, and is notable for its high activity temperatures and thermal tolerance.…”

Section: Introductionmentioning

confidence: 99%

Aerobic and anaerobic metabolism during activity in the lizardDipsosaurus dorsalis

1972

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Summary. 1. Oxygen consumption and lactate content of the lizard Dipsosaurus dorsalis were determined under standard conditions and for a bout of maximal activity induced by a 2-min period of electrical stimulation. Observations were made between 25 ~ and 45 ~ C.2. Maximal aerobic scope, 2.27 cm a 02/(g• occurred at 40~ (Figs. 2, 4). The increase in oxygen consumption during activity at the various temperatures between 25 ~ and 45~ represented 7-to 17-fold of corresponding resting levels.3. Lactate content of resting Dipsosaurus is independent of temperature and averages 0.25 mg/g body weight. Maximal lactate production during the activity induced by a 2-rain period of electrical stimulation occurred at 40~ (Fig. 3).The capacity of Dipsosaurus for anaerobic metabolism exceeds that of other lizards investigated, both in its magnitude and in its thermal dependence.4. The total amount of energy mobilized by Dipsosaurus in the activity induced by a 2-min period of electrical stimulation was maximal at 40~ (Fig. 4). Anaerobiosis accounts for a minimum of 58-83 % of the total energetic expenditure.5. It is postulated that the principal physiological adaptations to preferred thermal levels in reptiles have involved energy mobilization during and rapid recovery after activity.

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Biology of Desert Amphibians and Reptiles

Cited by 64 publications

References 463 publications

Hormonal Induction of Color Change in Female Leopard Lizards, Crotaphytus wislizenii

Hormonal Induction of Color Change in Female Leopard Lizards, Crotaphytus wislizenii

Basking and diurnal foraging in the dasyurid marsupial Pseudantechinus macdonnellensis

Aerobic and anaerobic metabolism during activity in the lizardDipsosaurus dorsalis

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