Compensation of thermal constraints along a natural environmental gradient in a Malagasy iguanid lizard (Oplurus quadrimaculatus)

Theisinger, Ole; Berg, Wiebke; Dausmann, Kathrin H.

doi:10.1016/j.jtherbio.2017.01.005

Cited by 13 publications

(9 citation statements)

References 41 publications

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“…As climate change is increasing mean environmental temperatures and the frequency of extreme thermal events ( Pachauri et al , 2014 ; Gutiérrez‐Pesquera et al , 2016 ; Theisinger et al , 2017 ), species with a limited capacity for acclimation will suffer from high maintenance costs as caused by the high SMRs. Especially in anuran larvae, having a low energy expenditure before and during metamorphosis is favorable since metamorphosis is a highly energy-consuming process ( Orlofske and Hopkins, 2009 ).…”

Section: Discussionmentioning

confidence: 99%

“…Consequently, larvae of X. laevis have the ability to compensate for changes in developmental temperature as they increased their thermal limits at warmer developmental temperatures ( Schaefer and Ryan, 2006 ; Gunderson and Stillman, 2015 ; Little and Seebacher, 2016 ). The driver for this adjustment are changes in the thermal reaction norm and hence of physiological nature ( Little and Seebacher, 2016 ; Theisinger et al , 2017 ).…”

Section: Discussionmentioning

confidence: 99%

“…Through its impact on physiology, temperature is considered to be the ‘abiotic master factor’ for ectotherms ( Dalvi et al , 2009 ; Turriago et al , 2015 ; Sunday et al , 2014 ; Berg et al , 2017 ; Theisinger et al , 2017 ). The tolerable thermal window of ectotherms is bracketed by critical temperatures (CT min and CT max ) beyond which survival is not possible and these limits occur where aerobic scope is either zero or negative ( Holzman and McManus, 1973 ).…”

Section: Introductionmentioning

confidence: 99%

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Thyroid hormone levels and temperature during development alter thermal tolerance and energetics ofXenopus laevislarvae

Ruthsatz

Dausmann

Peck³

et al. 2018

Conservation Physiology

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thyroid hormone levels and temperature during development alter thermal tolerance and energetics ofXenopus laevislarvae

Ruthsatz

Dausmann

Peck³

et al. 2018

Conservation Physiology

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“…1989; Andrews 1998; Gvoždík & Castilla 2001; Theisinger et al . 2017; Díaz de la Vega‐Pérez et al . 2019).…”

Section: Introductionunclassified

Resting metabolic rates increase with elevation in a mountain‐dwelling lizard

Plasman

Bautista

McCue³

et al. 2020

Integr. Zool.

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Individuals that inhabit broad elevational ranges may experience unique environmental challenges. Because temperature decreases with increased elevation, the ectotherms living at high elevations have to manage limited activity time and high thermoregulatory effort. The resting metabolic rate (RMR) of a postabsorptive animal is related to its total energy requirements as well as many other fitness traits. Mesquite lizards (Sceloporus grammicus) living on La Malinche Volcano, Mexico, inhabit a wide elevational range with some populations apparently thriving above the tree line. We measured the RMR of lizards from different elevations (i.e., 2,600, 3,200, and 4,100 m) at four ecologically relevant temperatures (i.e., 15, 25, 30, and 35 °C) and found that RMR of mesquite lizards increased with temperature and body mass. More importantly, lizards from the high‐elevation population had mass specific RMR that was higher at all temperatures. While the higher RMRs of high‐elevation populations imply higher metabolic costs at a given temperature these lizards were also smaller. Both of these traits may allow these high elevation populations to thrive in the face of the thermal challenges imposed by their environment.

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“…This phenomenon has been particularly well studied in reptiles (Bogert, 1949;Caldwell, While, & Wapstra, 2017;Dubois, Blouin-Demers, Shipley, & Thomas, 2009;Seebacher, Grigg, & Beard, 1999). For example, it has been shown that some lizard species that occur across broad altitudinal gradients can use behavioural thermal regulation to compensate for the decrease in environmental temperature that accompanies increasing elevation (Hertz & Huey, 1981;Theisinger, Berg, & Dausmann, 2017). However, efficient behavioural thermal regulation might also constrain the evolution of other thermal physiological mechanisms that could contribute to species survival over the long term (Huey, Hertz, & Sinervo, 2003).…”

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confidence: 99%

Does social thermal regulation constrain individual thermal tolerance in an ant species?

Villalta

Oms

Angulo

et al. 2020

Journal of Animal Ecology

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In ants, social thermal regulation is the collective maintenance of a nest temperature that is optimal for individual colony members. In the thermophilic ant Aphaenogaster iberica, two key behaviours regulate nest temperature: seasonal nest relocation and variable nest depth. Outside the nest, foragers must adapt their activity to avoid temperatures that exceed their thermal limits. It has been suggested that social thermal regulation constrains physiological and morphological thermal adaptations at the individual level. We tested this hypothesis by examining the foraging rhythms of six populations of A. iberica, which were found at different elevations (from 100 to 2,000 m) in the Sierra Nevada mountain range of southern Spain. We tested the thermal resistance of individuals from these populations under controlled conditions. Janzen's climatic variability hypothesis (CVH) states that greater climatic variability should select for organisms with broader temperature tolerances. We found that the A. iberica population at 1,300 m experienced the most extreme temperatures and that ants from this population had the highest heat tolerance (LT50 = 57.55°C). These results support CVH's validity at microclimatic scales, such as the one represented by the elevational gradient in this study. Aphaenogaster iberica maintains colony food intake levels across different elevations and mean daily temperatures by shifting its rhythm of activity. This efficient colony‐level thermal regulation and the significant differences in individual heat tolerance that we observed among the populations suggest that behaviourally controlled thermal regulation does not constrain individual physiological adaptations for coping with extreme temperatures.

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Compensation of thermal constraints along a natural environmental gradient in a Malagasy iguanid lizard (Oplurus quadrimaculatus)

Cited by 13 publications

References 41 publications

Thyroid hormone levels and temperature during development alter thermal tolerance and energetics ofXenopus laevislarvae

Thyroid hormone levels and temperature during development alter thermal tolerance and energetics ofXenopus laevislarvae

Resting metabolic rates increase with elevation in a mountain‐dwelling lizard

Does social thermal regulation constrain individual thermal tolerance in an ant species?

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