Acclimation Rate and Variability of the Critical Thermal Maximum in the Lizard Phrynosoma cornutum

Ballinger, Royce Ε.; Schrank, Gordon D.

doi:10.1086/physzool.43.1.30152481

Cited by 28 publications

(19 citation statements)

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“…Previously, experimental techniques have been used to establish critical thermal maxima (CFmax) in desert horned lizards (Cowles and Bogert, 1944;Ballinger and Schrank, 1970;Prieto and Whitford, 1971;Ballinger, LemosFspinal and Smith, 1998); these studies generally confirm that diurnal desert lizards are more heat tolerant, which is reflected in their thermal activity ranges and heat resistance. Together these studies report Cr^ax, with an average of 46.5°C (44.1-48.rC).…”

Section: Discussionmentioning

confidence: 96%

Thermoregulation during the summer season in the Goode’s horned lizard Phrynosoma goodei (Iguania: Phrynosomatidae) in Sonoran Desert

et al. 2014

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Reptiles in desert environments depend on habitat thermal quality to regulate their body temperature and perform biological activities. Understanding thermorégulation with respect to habitat thermal quality is critical for accurate predictions of species responses to climate change. We evaluated thermorégulation in Goode's homed lizard, Phrynosoma goodei, and measured habitat thermal quality at the Reserva de la Biosfera El Pinacate y Gran Desierto de Altar, Sonora, Mexico, during the hottest season of the year. We found that field-active body temperature averaged 38.1 ± 0.38°C, preferred body temperature in laboratory averaged 34.9 ± 0.18°C and preferred body temperature range was 32.5-37.3°C. Operative temperature (i.e. environmental temperature available to the lizards) averaged 43.0 ± 0.07°C, with maximum temperature being near 70°C, and 62.9% of operative temperatures were above preferred body temperature range of P. goodei. Microhabitat thermal quality occupied by the lizards was high in the moming (7:00-10:30) and afternoon (5:50-dusk). We found that despite strong thermal constraints P. goodei was highly accurate and efficient in regulating its body temperature and that it presented a bimodal thermoregulatory pattem, being active in the mornings and in the evenings in order to avoid high mid-day environmental temperatures. Despite its thermoregulatory ability, P. goodei may be vulnerable to climate warming.

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Section: Discussionmentioning

confidence: 96%

Thermoregulation during the summer season in the Goode’s horned lizard Phrynosoma goodei (Iguania: Phrynosomatidae) in Sonoran Desert

et al. 2014

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“…The experimental voluntary maximum was the Tb at which an individual lizard first attempted to escape the heat source (Ruibal 196 1). Continuous escape was an escape-reaction period characterized by continuous running activity (Ballinger and Schrank 1970). Panting threshold was recorded as the temperature at which the lizard gaped and breathed deeply (Heatwole et al 1973).…”

Section: Methodsmentioning

confidence: 99%

Comparative thermal ecology of the high-altitude lizard Sceloporus grammicus on the eastern slope of the Iztaccihuatl Volcano, Puebla, Mexico

Lemos‐Espinal¹,

Ballinger²

1995

Can. J. Zool.

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We studied the thermal ecology of Sceloporus grammicus occurring in very different thermal environments at 3700 and 4400 m elevation on the Iztaccihuatl Volcano, Mexico. Despite differences in the thermal environment between study sites, individual lizards maintained similar active body temperatures (around 31.5"C). Similar body temperatures at the two study sites probably result in differences in the cost of the thermoregulatory behavior. Lizards at the high-altitude site, an open area with few predators or competitors, presumably incur a lower thermoregulatory cost than those at the low-altitude site, which has a considerable number of shaded spots and more predators and competitors. Lizards at the low-elevation site showed a greater resistance to high temperatures than those at the high-elevation site. Physiological acclimatization to higher environmental temperatures at low elevation is likely to explain the greater heat tolerance. Freezing tolerance, thermoregulatory behavior, and low energy requirements permit S. grammicus to survive at high altitudes.RCsumC : Nous avons etudie l'kcologie thermique de Sceloporus grammicus dans des milieux h regimes thermiques trks differents, a 3700 et 4400 m d'altitude, sur le volcan Iztaccihuatl au Mexique. En depit de differences de regime thermique aux deux endroits, les lezards actifs avaient des tempkratures semblables (d'environ 3 1,5 "C) . Ces temperatures semblables aux deux endroits resultent probablement de differences dans les coQts relies aux comportements thermoregulateurs. Le site de haute altitude, une zone ouverte oh le nombre de predateurs et de competituers est moins important, correspond probablement a une thermoregulation moins coQteuse que le site de basse altitude qui comporte un nombre considerable de zones ombragees, plus de predateurs et plus de competiteurs. Les lezards du site de basse altitude ont manifeste une plus grande resistance aux temperatures elevees que les lezards de haute altitude. Un phenomkne d'acclimatation physiologique h des temperatures ambiantes plus elevees h basse altitude explique probablement la plus grande tolerance h la chaleur. La tolerance au gel, le comportement thermoregulateur et les besoins energetiques reduits permettent h S. grammicus de survivre h haute altitude. [Traduit par la Redaction]

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“…The air temperatures at which lizards were active varied from month to month (Smith and Ballinger 1995), suggesting that the differences between months are due to acclimation effects. The thermal tolerance of several species of lizard is influenced by acclimation (Larson 196 1 ;Ballinger and Schrank 1970;Kour and Hutchison 1970;Corn 1971;Art and Claussen 1982). Changes in photoperiod throughout the year may also influence the thermal tolerance observed (Lashbrook and Livezey 1970; see also Hutchison 1989, 1991).…”

Section: Discussionmentioning

confidence: 99%

“…Standard techniques were used to determine indices of thermal tolerance (Ballinger and Schrank 1970). Lizards were tethered on aluminum foil (to prevent substrate heating) under a heat lamp that caused lizards to heat up relatively quickly.…”

Section: Methodsmentioning

confidence: 99%

“…Tests were conducted throughout the day, but were concentrated in the morning. Body temperatures were taken with a quick-reading cloaca1 thermometer when the following behaviors were first observed: (i) initial escape attempt (IET; temperature at which individual first tried to escape (Ruibal 1961)), (ii) continuous escape (CET; temperature at which continuous escape behavior was displayed (Ballinger and Schrank 1970)), (iii) mouth gaping (PNT; temperature at which panting occurred (Heatwole et al 1973)), and (iv) critical thermal maximum (CTM; temperature corresponding to the onset of muscle spasms and at which the lizard would no longer escape from temperature conditions that would result in death (Cowles and Bogert 1944;Hutchison 1961 ; see also Pough and Gans 1982)). Lizards were removed from the heat source and allowed to recover.…”

Section: Methodsmentioning

confidence: 99%

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Thermal tolerance in the tree lizard (Urosaurus ornatus) from a desert population and a low montane population

Smith¹,

Ballinger²

1994

Can. J. Zool.

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We studied the thermal tolerance of two populations of the tree lizard Urosaurus ornatus from a desert environment in southwestern New Mexico and a low montane environment in southeastern Arizona. In general, there were no differences in thermal tolerance between the two populations. Desert individuals tended to have higher panting thresholds in the summer than low montane individuals, whereas the reverse held for late summer and fall. Males had lower critical thermal maxima than females in the low montane population, but there was no difference in the desert population. Thermal tolerance varied from month to month, tolerances being highest during the summer. Thermal tolerance was related to body size (measured as both snout–vent length and body mass), explaining up to 39% of the variance.

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Acclimation Rate and Variability of the Critical Thermal Maximum in the Lizard Phrynosoma cornutum

Cited by 28 publications

References 0 publications

Thermoregulation during the summer season in the Goode’s horned lizard Phrynosoma goodei (Iguania: Phrynosomatidae) in Sonoran Desert

Thermoregulation during the summer season in the Goode’s horned lizard Phrynosoma goodei (Iguania: Phrynosomatidae) in Sonoran Desert

Comparative thermal ecology of the high-altitude lizard Sceloporus grammicus on the eastern slope of the Iztaccihuatl Volcano, Puebla, Mexico

Thermal tolerance in the tree lizard (Urosaurus ornatus) from a desert population and a low montane population

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