Field and Selected Body Temperatures of the Lizards Sceloporus aeneus and Sceloporus bicanthalis

Andrews, Robin M.; Cruz, Fausto R. Méndez–de la; Cruz, M. Villagran-Santa; Rodríguez-Romero, Felipe

doi:10.2307/1565547

Cited by 48 publications

(24 citation statements)

References 16 publications

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“…P. patagonicus, L. elongatus and L. pictus show a T b gradient from 30 1C (in P. patagonicus and L. elongatus from the steppe) to 33 1C (in L. elongatus and L. pictus from the rain forest, Ibargu¨engoytı´a and Cussac, 2002). P. patagonicus and L. elongatus (from steppe) mean T b resulted lower than mean T b for most lizards (34-36 1C, Andrews et al, 1999), and in contrast with the thermal conservative character of Liolaemus genus proposed by Fuentes and Jaksic (1979), resulted lower than most Liolaemus species (35 1C: Fuentes and Jaksic, 1979;31-32 1C: Halloy and Laurent, 1988;31.6 1C: Labra, 1998;Labra et al, 2001;32-34 1C, Pearson and Bradford, 1976), with the exception of Liolaemus magellanicus, the southernmost Liolaemus lizards, which shows body temperatures between 26 and 27 1C (Jaksic and Schwenk, 1983). In addition, L. elongatus shows interspecific T b differences between steppe and rain forest (Ibargu¨engoytı´a and Cussac, 2002).…”

Section: Discussionmentioning

confidence: 77%

“…The most commonly cited immediate benefit of viviparity in reptiles is that pregnant females can fasten embryonic development via thermoregulation and partially compensate for a short active season (Shine, 1985). More recent works have approach the concept that the main benefit of viviparity could be to maintain stability of body temperatures during development (Andrews et al, 1999;Charland and Gregory, 1990;Ibargu¨engoytı´a and Cussac, 2002;Shine, 2004). Hubert (1985) postulate that an increase of temperature decreases developmental time, but development is also more rapid when incubation proceeds at a constant rather than a variable temperature.…”

Section: Discussionmentioning

confidence: 99%

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Field, selected body temperature and thermal tolerance of the syntopic lizards Phymaturus patagonicus and Liolaemus elongatus (Iguania: Liolaemidae)

Ibargüengoytía

2005

Journal of Arid Environments

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Section: Discussionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Field, selected body temperature and thermal tolerance of the syntopic lizards Phymaturus patagonicus and Liolaemus elongatus (Iguania: Liolaemidae)

Ibargüengoytía

2005

Journal of Arid Environments

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“…The notion of 'preferred' or 'selected' body temperatures should be employed with caution, because there may not be a single species-specific optimal body temperature (e.g. Hertz et al, 1993;Christian and Weavers, 1996;Andrews et al, 1999). On the contrary, optimal body temperatures may be plastic and change with acclimatisation, reflecting a shift in the thermal dependency of physiological processes, so that, as demonstrated for alligators in this study, the a priori assumption that 'warm is always better' may not always be true.…”

Section: Discussionmentioning

confidence: 99%

Seasonal acclimatisation of muscle metabolic enzymes in a reptile(Alligator mississippiensis)

Seebacher

Guderley

Elsey

et al. 2003

Journal of Experimental Biology

123

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The concept that reptiles regulate their body temperature by behavioural means, such as shuttling between sun and shade (Cowles and Bogert, 1944;Hertz et al., 1993), has become widely accepted in vertebrate thermal physiology. Behavioural adjustments enable many diurnal species of reptile to maintain high and stable body temperatures in the face of fluctuations in environmental temperatures (Avery, 1982;Seebacher et al., 1999). The importance of body temperature regulation is seen to lie in maximising the rates of temperature-sensitive physiological functions (Huey, 1982). The rates of chemical reactions, including those catalysed by enzymes, are dependent on the energetic state of the compounds involved, which in turn is strongly influenced by temperature. The rates of most physiological processes are, therefore, a direct function of the temperature of the organism. Thermoregulation that includes high metabolic heat production combined with effective insulation often allows endotherms to maintain an elevated body temperature within a narrow range (Lovegrove et al., 1991). The low metabolic rates of reptiles make metabolic heat production negligible, and regulation of body temperature is achieved by behavioural means such as microhabitat selection (Cowles Reptiles living in heterogeneous thermal environments are often thought to show behavioural thermoregulation or to become inactive when environmental conditions prevent the achievement of preferred body temperatures. By contrast, thermally homogeneous environments preclude behavioural thermoregulation, and ectotherms inhabiting these environments (particularly fish in which branchial respiration requires body temperature to follow water temperature) modify their biochemical capacities in response to long-term seasonal temperature fluctuations. Reptiles may also be active at seasonally varying body temperatures and could, therefore, gain selective advantages from regulating biochemical capacities. Hence, we tested the hypothesis that a reptile (the American alligator Alligator mississippiensis) that experiences pronounced seasonal fluctuations in body temperature will show seasonal acclimatisation in the activity of its metabolic enzymes. We measured body temperatures of alligators in the wild in winter and summer (N=7 alligators in each season), and we collected muscle samples from wild alligators (N=31 in each season) for analysis of metabolic enzyme activity (lactate dehydrogenase, citrate synthase and cytochrome c oxidase). There were significant differences in mean daily body temperatures between winter (15.66±0.43°C; mean ± S.E.M.) and summer (29.34±0.21°C), and daily body temperatures fluctuated significantly more in winter compared with summer. Alligators compensated for lower winter temperatures by increasing enzyme activities, and the activities of cytochrome c oxidase and lactate dehydrogenase were significantly greater in winter compared with summer at all assay temperatures. The activity of citrate synthase was significantly greater in the winter s...

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“…In the Guerrero population, there was no difference in T b between gravid and nongravid females (Lemos-Espinal et al 1997a). Differences in T b between gravid and non-gravid females may reflect thermoregulatory strategies of the former to optimize embryonic development (Beuchat 1988, Andrews et al 1999.…”

Section: Discussionmentioning

confidence: 91%

Ecologia térmica do lagarto Sceloporus gadoviae (Squamata: Phrynosomatidae) em uma região semi-árida do sul de Puebla, México.

Woolrich-Piña¹,

Lemos‐Espinal²,

Smith³

et al. 2012

Phyllomedusa

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Field and Selected Body Temperatures of the Lizards Sceloporus aeneus and Sceloporus bicanthalis

Cited by 48 publications

References 16 publications

Field, selected body temperature and thermal tolerance of the syntopic lizards Phymaturus patagonicus and Liolaemus elongatus (Iguania: Liolaemidae)

Field, selected body temperature and thermal tolerance of the syntopic lizards Phymaturus patagonicus and Liolaemus elongatus (Iguania: Liolaemidae)

Seasonal acclimatisation of muscle metabolic enzymes in a reptile(Alligator mississippiensis)

Ecologia térmica do lagarto Sceloporus gadoviae (Squamata: Phrynosomatidae) em uma região semi-árida do sul de Puebla, México.

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