A Comparative Study of Preferred Body Temperatures and Critical Thermal Tolerance Limits among Populations of Zootoca vivipara (Squamata: Lacertidae) along an Altitudinal Gradient

Castilla, Aurora M.; Gvoždı́k, Lumı́r

doi:10.2307/1565967

Cited by 79 publications

(64 citation statements)

References 33 publications

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“…Furthermore, Gvoždik and Castilla (2001) reported considerable individual variation in the thermal preference and tolerance limits of Z. vivipara, while they found no differences in an altitudinal interpopulation comparison. These observations do not suggest a simple explanation, and this source of variation deserves further investigation.…”

Section: Discussionmentioning

confidence: 95%

“…Z. vivipara is an excellent model for experimental studies of thermoregulation as its thermal physiology and ecology are well documented. It is a very accurate and effective thermoregulator in different thermal environments (Van Damme et al 1987;Gvoždik 2002) and has evolutionarily rigid thermal preference and tolerance limits (Van Damme et al 1990a;Gvoždik and Castilla 2001;Uller and Olsson 2003). Furthermore, while the preferred body temperature range does not necessarily include optima for the different physiological functions (Huey and Bennett 1987), in the case of Z. vivipara it does (Van Damme et al 1990a, 1990b1991).…”

Section: Introductionmentioning

confidence: 99%

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Experimental support for the cost–benefit model of lizard thermoregulation: the effects of predation risk and food supply

et al. 2007

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Huey and Slatkin's (Q Rev Biol 51:363-384, 1976) cost-benefit model of lizard thermoregulation predicts variation in thermoregulatory strategies (from active thermoregulation to thermoconformity) with respect to the costs and benefits of the thermoregulatory behaviour and the thermal quality of the environment. Although this framework has been widely employed in correlative field studies, experimental tests aiming to evaluate the model are scarce. We conducted laboratory experiments to see whether the common lizard Zootoca vivipara, an active and effective thermoregulator in the field, can alter its thermoregulatory behaviour in response to differences in perceived predation risk and food supply in a constant thermal environment. Predation risk and food supply were represented by chemical cues of a sympatric snake predator and the lizards' food in the laboratory, respectively. We also compared males and postpartum females, which have different preferred or "target" body temperatures. Both sexes thermoregulated actively in all treatments. We detected sex-specific differences in the way lizards adjusted their accuracy of thermoregulation to the treatments: males were less accurate in the predation treatment, while no such effects were detected in females. Neither sex reacted to the food treatment. With regard to the two main types of thermoregulatory behaviour (activity and microhabitat selection), the treatments had no significant effects. However, postpartum females were more active than males in all treatments. Our results further stress that increasing physiological performance by active thermoregulation has high priority in lizard behaviour, but also shows that lizards can indeed shift their accuracy of thermoregulation in response to costs with possible immediate negative fitness effects (i.e. predation-caused mortality).

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Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Experimental support for the cost–benefit model of lizard thermoregulation: the effects of predation risk and food supply

et al. 2007

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“…Many of the critical leaps in our understanding of how temperature regime shapes the thermal biology of ectotherms have been made by comparing the physiology and behaviours of animals along steep environmental gradients that represent extremes in thermal magnitude and variability over large (for example, latitudinal 8,9 and altitudinal gradients 10 ) and small spatial scales (for example, intertidal gradients 5,11 ). Hydrothermal vents create one of the most thermally variable habitats in which ectotherms live.…”

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confidence: 99%

Deep-sea hydrothermal vent animals seek cool fluids in a highly variable thermal environment

et al. 2010

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The thermal characteristics of an organism ' s environment affect a multitude of parameters, from biochemical to evolutionary processes. Hydrothermal vents on mid-ocean ridges are created when warm hydrothermal fl uids are ejected from the seafl oor and mixed with cold bottom seawater; many animals thrive along these steep temperature and chemical gradients. Twodimensional temperature maps at vent sites have demonstrated order of magnitude thermal changes over centimetre distances and at time intervals from minutes to hours. To investigate whether animals adapt to this extreme level of environmental variability, we examined differences in the thermal behaviour of mobile invertebrates from aquatic habitats that vary in thermal regime. Vent animals were highly responsive to heat and preferred much cooler fl uids than their upper thermal limits, whereas invertebrates from other aquatic environments risked exposure to warmer temperatures. Avoidance of temperatures well within their tolerated range may allow vent animals to maintain a safety margin against rapid temperature fl uctuations and concomitant toxicity of hydrothermal fl uids.

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“…In the other hand, inter-and intraspecifi c T pref in lizards is highly conservative (Huey & Bennet, 1987;Van Damme et al, 1990;Hertz et al, 1993;Díaz, 1997;Labra, 1998;Gvoždík & Castilla, 2001;Gvoždík, 2002;Medina et al, 2009). However, interspecifi c variation in T pref has been observed in Australian geckos and some Chilean Liolaemus lizards (Angilletta & Werner, 1998;Labra, 1998), as well as variation in Takydromus septentrionalis over a latitudinal gradient (Du, 2006).…”

Section: Discussionmentioning

confidence: 99%

“…Very low environmental temperature, relative to the preferred and/or critical temperature of individuals would decrease the available time needed for organisms to effectively basking and thermoregulate. Thus, lizards from highland environments could face the effects of low temperatures using two strategies as extremes of a continuum: by behavioral adjustments, such as searching more exposed and sunny microsites and reducing activity time (Hertz & Huey, 1981;Hertz, 1981;Gvoždík & Castilla, 2001;Gvoždík, 2002) or by physiological adaptation, such as decreased in the critical temperature minimum values to hold out cold environments (Muñoz et al, 2014). Besides, based on data about thermal biology, Sinervo et al (2010) hypothesized that high elevation reptile species are particularly threatened by climate change, due to their restricted distribution, which would decrease progressively as temperature increase, and as these environments are colonized by competitors or predators from lowlands, pushing up highland species toward an "endless road", at higher elevations.…”

Section: Palabras-clavementioning

confidence: 99%

Thermoregulation in the Andean lizard Anolis heterodermus (Squamata: Dactyloidae) at high elevation in the Eastern Cordillera of Colombia.

Méndez-Galeano

Calderón‐Espinosa

2017

Iheringia, Sér. Zool.

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ABSTRACT. Low thermal quality environments, such extreme latitudes or high elevation regions, are highly expensive for reptiles in terms of thermoregulation. Thus, physiological adaptations or behavioral adjustments to live in these habitats have evolved in some species. Anolis heterodermus (Duméril, 1851) is an anole lizard that lives at high elevations in the Andes region. In this paper, we attempted to elucidate the thermoregulation strategy of a population of this species from the eastern cordillera of Colombia during wet and dry seasons. We measured body temperatures (T b ), operative temperatures (T e ) and preferred temperatures (T pref ). Based on these data, we obtained accuracy (d̄b), environmental thermal quality (d̄e) and effi ciency of thermoregulation (E) indexes. There were no signifi cant diff erences of T b or d̄b between seasons, sexes, ages, and for T pref between sexes or ages, but we found diff erences in T e and d̄e between seasons. The indexes suggested high thermoregulatory accuracy, low thermal environment quality and indicated that A. heterodermus was an active thermoregulator in both seasons. Broad ranges of T b and the species association with microhabitats with high solar radiation suggest eurythermy and heliothermy. Anolis heterodermus lives in a low thermal quality habitat, using exposed perches, which seems the most effi cient thermal microhabitats. We concluded that A. heterodermus performed behavioral adjustment for compensating seasonal variation in the environmental thermal costs.KEYWORDS. Thermal quality, thermoregulatory accuracy, seasonal variation, heliothermy.RESUMEN. Termorregulación en el lagarto andino Anolis heterodermus (Squamata: Dactyloidae) a una alta elevación en la Cordillera Oriental de Colombia. Ambientes con baja calidad térmica, tales como las latitudes extremas o regiones en altas elevaciones, son altamente costosos para los reptiles en términos de termorregulación, por lo cual algunas especies han adquirido adaptaciones fi siológicas o ajustes conductuales para habitar estos ambientes. Anolis heterodermus (Duméril, 1851) es un lagarto que habita a altas elevaciones en la región andina. En el presente trabajo se evaluó la termorregulación de una población de esta especie en la cordillera oriental de Colombia durante las épocas húmeda y seca. Se midieron temperaturas corporales (T b ), operativas (T e ) y de preferencia (T pref ). Con base en estas variables, se obtuvieron los índices de calidad térmica ambiental (d̄e), exactitud (d̄b) y efi ciencia (E) de la termorregulación. No hubo diferencias signifi cativas entre la T b o d̄b entre épocas, sexos o edades y tampoco de la T pref entre sexos o edades, pero encontramos diferencias de T e y d̄e entre épocas. Los índices sugieren alta exactitud termorreguladora y baja calidad térmica del ambiente, por lo tanto indican que A. heterodermus es un termorregulador activo para ambas épocas. El amplio intervalo de T b y la asociación de la especie a microhábitats con alta radiación solar sugieren euritérmia y heliot...

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A Comparative Study of Preferred Body Temperatures and Critical Thermal Tolerance Limits among Populations of Zootoca vivipara (Squamata: Lacertidae) along an Altitudinal Gradient

Cited by 79 publications

References 33 publications

Experimental support for the cost–benefit model of lizard thermoregulation: the effects of predation risk and food supply

Experimental support for the cost–benefit model of lizard thermoregulation: the effects of predation risk and food supply

Deep-sea hydrothermal vent animals seek cool fluids in a highly variable thermal environment

Thermoregulation in the Andean lizard Anolis heterodermus (Squamata: Dactyloidae) at high elevation in the Eastern Cordillera of Colombia.

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