From conceptual to computational: Cost and benefits of lizard thermoregulation revisited

Alford, John G.; Lutterschmidt, William I.

doi:10.1016/j.jtherbio.2018.09.015

Cited by 5 publications

(5 citation statements)

References 24 publications

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“…During the day, lizards were more effective thermoregulators where thermal quality was lower (high elevation). These results are consistent with those of a global analysis of the effect of thermal quality on thermoregulation of lizards that indicated that poor thermal quality led to higher effectiveness of thermoregulation (Blouin‐Demers & Nadeau, 2005), with a mathematical formalization of Huey & Slatkin’s (1976) cost–benefit model that indicated that thermoregulatory effort is predicted to increase under certain conditions when thermal quality decreases (Alford & Lutterschmidt, 2018), with an extension of Huey & Slatkin’s (1976) cost–benefit model to include high temperatures that also predicted that thermoregulatory effort should increase when thermal quality decreases (Vickers et al ., 2011), and with experimental manipulations of thermal quality (Basson et al ., 2016). The explanation Blouin‐Demers & Nadeau (2005) proposed was that the physiological disadvantages of thermoconformity are small in thermally benign habitats (high thermal quality) because T b is close to T o even in the absence of thermoregulatory behaviour in such habitats.…”

Section: Discussionsupporting

confidence: 86%

“…Blouin‐Demers & Nadeau, 2005) and theoretical advances (e.g. Vickers et al ., 2011; Alford & Lutterschmidt, 2018). Across an elevational gradient where the costs of thermoregulation become higher with increasing elevation, it appears that the disadvantages associated with thermoconformity when thermal quality is low are more important in influencing investment into thermoregulation than the costs incurred for thermoregulation by S .…”

Section: Discussionmentioning

confidence: 99%

“…The cost–benefit model of thermoregulation (Huey & Slatkin, 1976) predicts that as the costs of thermoregulation increase, thermoregulatory effort should decrease. Interestingly, a recent mathematical formalization of Huey & Slatkin’s (1976) conceptual and graphical model confirmed that its general predictions are upheld, but that perfect thermoregulation is never an optimal strategy and that under certain conditions thermoregulation may increase when costs increase (Alford & Lutterschmidt, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Changes in thermal quality of the environment along an elevational gradient affect investment in thermoregulation by Yarrow’s spiny lizards

Lymburner

Blouin‐Demers

2020

Journal of Zoology

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Body temperature affects physiological processes and, consequently, is assumed to have a large impact on fitness. Lizards need to thermoregulate behaviourally to maintain their body temperature within a range that maximizes performance, but there are costs associated with thermoregulation. The thermal quality of an environment directly affects the amount of time and energy that must be invested by an individual to maintain an optimal body temperature for performance; time and energy are major costs of thermoregulation. According to Huey and Slatkin's (Q. Rev. Biol. 1976, 363) cost-benefit model of thermoregulation, lizards should only thermoregulate when the benefits outweigh the costs. Thus, in habitats of poor thermal quality, lizards should invest less into thermoregulation. We tested the hypothesis that the thermal quality of an environment dictates investment in thermoregulation across an elevational gradient. Increases in elevation are accompanied by decreases in temperature and therefore thermal quality. We recorded body temperatures of Yarrow's spiny lizards (Sceloporus jarrovii) at ten talus slopes along an elevational gradient of over 1000 m. We found a significant positive relationship between elevation and effectiveness of thermoregulation, opposite to the prediction of the cost-benefit model of thermoregulation. This suggests that the disadvantages of thermoconformity may be greater than the costs of thermoregulating as habitats become more thermally challenging.

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Section: Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Changes in thermal quality of the environment along an elevational gradient affect investment in thermoregulation by Yarrow’s spiny lizards

Lymburner

Blouin‐Demers

2020

Journal of Zoology

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“…Differences in water fluxes between sexes and age-classes can thus hardly explain the here observed patterns, while differences in thermoregulatory activity are congruent with the observed effects. If precipitation is falling, common lizards hide and are thus not able to thermoregulate, and differences in thermoregulation directly feed back into growth and timing of egg laying 29 . Moreover, thermoregulatory capacity is known to depend on body size 28 and on coloration 30 .…”

Section: Discussionmentioning

confidence: 99%

Age-dependent effects of moderate differences in environmental predictability forecasted by climate change, experimental evidence from a short-lived lizard (Zootoca vivipara)

Masó

Kaufmann

Clavero

et al. 2019

Sci Rep

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Whether and how differences in environmental predictability affect life-history traits is controversial and may depend on mean environmental conditions. Solid evidence for effects of environmental predictability are lacking and thus, the consequences of the currently observed and forecasted climate-change induced reduction of precipitation predictability are largely unknown. Here we experimentally tested whether and how changes in the predictability of precipitation affect growth, reproduction, and survival of common lizard Zootoca vivipara. Precipitation predictability affected all three age classes. While adults were able to compensate the treatment effects, yearlings and juvenile females were not able to compensate negative effects of less predictable precipitation on growth and body condition, respectively. Differences among the age-classes’ response reflect differences (among age-classes) in the sensitivity to environmental predictability. Moreover, effects of environmental predictability depended on mean environmental conditions. This indicates that integrating differences in environmental sensitivity, and changes in averages and the predictability of climatic variables will be key to understand whether species are able to cope with the current climatic change.

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“…Carryover effects, impacts of events in one season that are realized in a later season (O'Connor et al, 2014), could also delay the appearance of tolerance costs. Additionally, extensions of the cost–benefit framework we used have asserted that while the original model (Huey & Slatkin, 1976) quantified costs of tolerance in energetic terms, these units overlook broader fitness costs (e.g., predation risk, infection, and fecundity) that may be even more critical, especially at warm temperatures (Alford & Lutterschmidt, 2018; Vickers et al, 2011). For example, though body size distributions of our focal groups before dam construction are unknown, the stark difference in FL we observed could reflect a fitness cost of physiological tolerance in Keno trout.…”

Section: Discussionmentioning

confidence: 99%

Habitat fragmentation drives divergent survival strategies of a cold‐water fish in a warm landscape

et al. 2023

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Climate change is a global phenomenon, but natural selection occurs within landscapes. Many global analyses predict how climate change will shape behavior and physiology, but few incorporate information from the landscape scales at which animals actually respond to selective pressure. We compared cold‐water fish (redband trout Oncorhynchus mykiss newberrii) from neighboring habitats in a naturally warm, recently fragmented basin to understand how different responses to warming may arise from landscape constraints. Trout in warm, hydrologically connected Upper Klamath Lake fled summer temperatures and sought refuge in cool tributaries, while trout in an equally warm but fragmented reach of the Klamath River endured summer conditions. Trout in the river were more physiologically tolerant of high temperatures than trout in the lake across multiple metrics, including capacity for aerobic activity, recovery from exertion, and loss of equilibrium. Two independent metrics of energetic condition indicated that the behavioral strategy of trout in the lake came at a substantial energetic cost, while the physiological strategy of trout in the river was able to mitigate most energetic consequences of high temperatures. No clear genetic basis for increased tolerance was found in trout from the river, which may suggest tolerance was derived from plasticity, although our analysis could not rule out genetic adaptation. Our results show that landscape processes such as fragmentation can cause different climate survival strategies to emerge in neighboring populations. Connecting the mechanisms that favor similar survival strategies among related organisms at broad scales with mechanisms that drive landscape‐scale variability within taxa should be a major goal for future predictions of biological responses to climate change.

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From conceptual to computational: Cost and benefits of lizard thermoregulation revisited

Cited by 5 publications

References 24 publications

Changes in thermal quality of the environment along an elevational gradient affect investment in thermoregulation by Yarrow’s spiny lizards

Changes in thermal quality of the environment along an elevational gradient affect investment in thermoregulation by Yarrow’s spiny lizards

Age-dependent effects of moderate differences in environmental predictability forecasted by climate change, experimental evidence from a short-lived lizard (Zootoca vivipara)

Habitat fragmentation drives divergent survival strategies of a cold‐water fish in a warm landscape

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