Individual variation in amphibian metabolic rates during overwintering: implications for a warming world

Kristín, Peter; Gvoždı́k, Lumı́r

doi:10.1111/jzo.12157

Cited by 10 publications

(7 citation statements)

References 19 publications

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“…during sleep [daily] or during overwintering [seasonally]), environmental temperature variation is buffered by the ectotherm's ability to find a suitable shelter, which should provide not only protection against predators and extreme temperatures but also thermal conditions minimising their energy costs (standard metabolic rate). Inactive ectotherms do not feed; hence, their body fat reserves depend on the magnitude of standard metabolic rate at their body temperature (Kristín and Gvoždík ). The position and width of body temperature distribution during inactivity determines whether population growth is affected by species‐specific thermal dependence of metabolic rate (Podhajský and Gvoždík ) or thermal tolerance, or indeed, both.…”

Section: Resultsmentioning

confidence: 99%

Just what is the thermal niche?

Gvoždı́k

2018

Oikos

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The term ‘thermal niche’ is frequently used in ecology. Using the Web of Science database, I reviewed how the term has been used in current literature (2000–2015). While the use of ‘thermal niche’ has increased notably over the last 15 years, its meaning differs between studies. Only 10% of studies measured thermal niche directly as the range of body temperatures enabling non‐zero population growth. Indirect thermal niche estimates were based on distributional data (47%), thermal reaction norms (36%) and preferred body temperatures (7%). Here, I present a new conceptual unification model for the term in which I propose that the choice of commonly used thermal physiology traits for indirect thermal niche estimates depends on behavioural ability to buffer variation in thermal environments during both activity and inactivity (diel or seasonal). The resulting body temperature distribution determines the relative importance of key thermal physiology traits, thermal tolerance, thermal preferenda and temperature dependence of metabolic rate. This framework provides a guide for using the term ‘thermal niche’ in ecological literature and identifies key areas for further research.

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Section: Resultsmentioning

confidence: 99%

Just what is the thermal niche?

Gvoždı́k

2018

Oikos

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“…The body temperature of amphibians dictates their metabolic activity, with higher metabolic rates at higher temperatures (Homyack et al 2010, Kristín & Gvoždík 2014. With any event that creates a situation in which not all necessary thermal zones are available, the frog will no longer be able to display adequate thermoregulatory behaviour.…”

Section: Discussionmentioning

confidence: 99%

Temperature exposure and possible thermoregulation strategies in the Titicaca water frog Telmatobius culeus, a fully aquatic frog of the High Andes

Muñoz-Saravia¹,

Callapa²,

Janssens³

2018

Endang. Species. Res.

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Temperature has an important effect on amphibians, influencing virtually all physiological systems. Thermoregulation is used to manage unfavourable thermal conditions, but has been poorly studied in aquatic amphibians, and no information is available for adult aquatic anurans. We studied the temperatures to which the Critically Endangered and high Andean fully aquatic Titicaca water frog Telmatobius culeus is exposed and investigated possible thermoregulation strategies of the species in the wild. We measured water temperature in different seasons, microhabitats and depths at which T. culeus is most abundant. We established transects to obtain population densities and activity patterns of the species during the day. Seasonal and daily temperature variations as well as temperature variations among depths and microhabitats were noted. These variations were associated with densities of visible T. culeus, where adult densities were higher at depths with more stable temperatures. T. culeus behaviour associated with thermoregulation strategies in the aquatic habitat included depth selection and movement of individuals between different microhabitats. Selection of microhabitat depended on the temperature at a site and the hour of the day. These results indicate possible behavioural thermoregulation strategies such as movement to different sites or basking used by a highly specialized amphibian, and provide insights into how aquatic benthic organisms use strategies for thermoregulation in aquatic heterogeneous environments. These strategies are probably also used by other aquatic organisms from the tropical Andes. Knowledge of how these organisms respond to temperature could also help to understand the impact of global warming on their status.

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“…burrows) during adverse environmental conditions. While information on the behaviour of newts in such retreats is limited, they are known to remain active even at low body temperatures (4°C) [46], allowing them to change their underground position according to their thermal and hydric requirements, as observed in other amphibians [22,23,47]. The overall aims of this study were twofold: first, to model how thermo- and hydroregulatory strategies affect retreat depth during the winter and summer, and second, to assess the contribution of behavioural strategies, seasonal acclimation of metabolic rate and different climate change scenarios to the mandatory energy costs of individuals hidden in burrows.…”

Section: Introductionmentioning

confidence: 99%

Impacts of behaviour and acclimation of metabolic rate on energetics in sheltered ectotherms: a climate change perspective

Enriquez-Urzelai,

Gvoždík

2024

Proc. R. Soc. B.

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Many ectothermic organisms counter harsh abiotic conditions by seeking refuge in underground retreats. Variations in soil hydrothermal properties within these retreats may impact their energy budget, survival and population dynamics. This makes retreat site choice a critical yet understudied component of their strategies for coping with climate change. We used a mechanistic modelling approach to explore the implications of behavioural adjustments and seasonal acclimation of metabolic rate on retreat depth and the energy budget of ectotherms, considering both current and future climate conditions. We used a temperate amphibian, the alpine newt ( Ichthyosaura alpestris ), as a model species. Our simulations predict an interactive influence of different thermo- and hydroregulatory strategies on the vertical positioning of individuals in underground refuges. The adoption of a particular strategy largely determines the impact of climate change on retreat site choice. Additionally, we found that, given the behavioural thermoregulation/hydroregulation and metabolic acclimation patterns considered, behaviour within the retreat has a greater impact on ectotherm energetics than acclimation of metabolic rate under different climate change scenarios. We conclude that further empirical research aimed at determining ectotherm behavioural strategies during both surface activity and inactivity is needed to understand their population dynamics and species viability under climate change.

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Individual variation in amphibian metabolic rates during overwintering: implications for a warming world

Cited by 10 publications

References 19 publications

Just what is the thermal niche?

Just what is the thermal niche?

Temperature exposure and possible thermoregulation strategies in the Titicaca water frog Telmatobius culeus, a fully aquatic frog of the High Andes

Impacts of behaviour and acclimation of metabolic rate on energetics in sheltered ectotherms: a climate change perspective

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