Positive Effects of Acclimation Temperature on the Critical Thermal Maxima of Ambystoma mexicanum and Xenopus laevis

Orille, Alex C.; Mcwhinnie, Ryan B.; Brady, Sean P.; Raffel, Thomas R.

doi:10.1670/19-080

Cited by 3 publications

(1 citation statement)

References 25 publications

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“…Different life-history stages of an organism may have different responses in their temperature dependent performance and activity time (Wilson et al 2000;Bodensteiner et al 2021). However, in contrast to adult amphibians (Orille et al 2020), the knowledge about thermal tolerance or temperaturedependent activity of tadpoles is limited (Wilson et al 2000;Ruthsatz et al 2018). Although, it was already assumed that thermal limits among different life-history stages of X. laevis may differ (Balinsky 1969;Nelson et al 1982;Wu and Gerhart 1991).…”

Section: Differences Between Life-history Stagesmentioning

confidence: 99%

More time for aliens? Performance shifts lead to increased activity time budgets propelling invasion success

et al. 2022

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In the Grinnellian niche concept, the realized niche and potential distribution is characterized as an interplay among the fundamental niche, biotic interactions and geographic accessibility. Climate is one of the main drivers for this concept and is essential to predict a taxon’s distribution. Mechanistic approaches can be useful tools, which use fitness-related aspects like locomotor performance and critical thermal limits to predict the potential distribution of an organism. These mechanistic approaches allow the inclusion key ecological processes like local adaptation and can account for thermal performance traits of different life-history stages. The African Clawed Frog, Xenopus laevis, is a highly invasive species occurring on five continents. The French population is of special interest due to an ongoing expansion for 40 years and a broad base of knowledge. We hypothesize that (1) the French population exhibits increased activity time in the invasive European range that could be devoted to fitness-relevant activity and (2) tadpoles may have less activity time available than adult frogs from the same range. We investigate how thermal performance traits translate into activity time budgets and how local adaptation and differences in the thermal responses of life-history stages may boost the European Xenopus invasion. We use a mechanistic approach based on generalized additive mixed models, where thermal performance curves were used to predict the hours of activity and to compare the potential activity time budgets for two life-history stages of native and invasive populations. Our results show that adult French frogs have more activity time available in Europe compared to South African frogs, which might be an advantage in searching for prey or escaping from predators. However, French tadpoles do not have more activity time in Europe compared to the native South African populations suggesting that tadpoles do not suffer the same strong selective pressure as adult frogs.

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Section: Differences Between Life-history Stagesmentioning

confidence: 99%

More time for aliens? Performance shifts lead to increased activity time budgets propelling invasion success

et al. 2022

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A comprehensive database of amphibian heat tolerance

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et al. 2022

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Rising temperatures represent a significant threat to the survival of ectothermic animals. As such, upper thermal limits represent an important trait to assess the vulnerability of ectotherms to changing temperatures. For instance, one may use upper thermal limits to estimate current and future thermal safety margins (i.e., the proximity of upper thermal limits to experienced temperatures), use this trait together with other physiological traits in species distribution models, or investigate the plasticity and evolvability of these limits for buffering the impacts of changing temperatures. While datasets on thermal tolerance limits have been previously compiled, they sometimes report single estimates for a given species, do not present measures of data dispersion, and are biased towards certain parts of the globe. To overcome these limitations, we systematically searched the literature in seven languages to produce the most comprehensive dataset to date on amphibian upper thermal limits, spanning 3,095 estimates across 616 species. This resource will represent a useful tool to evaluate the vulnerability of amphibians, and ectotherms more generally, to changing temperatures.

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Developmental plasticity in thermal tolerance: Ontogenetic variation, persistence, and future directions

et al. 2022

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Understanding the factors affecting thermal tolerance is crucial for predicting the impact climate change will have on ectotherms. However, the role developmental plasticity plays in allowing populations to cope with thermal extremes is poorly understood. Here, we meta‐analyse how thermal tolerance is initially and persistently impacted by early (embryonic and juvenile) thermal environments by using data from 150 experimental studies on 138 ectothermic species. Thermal tolerance only increased by 0.13°C per 1°C change in developmental temperature and substantial variation in plasticity (~36%) was the result of shared evolutionary history and species ecology. Aquatic ectotherms were more than three times as plastic as terrestrial ectotherms. Notably, embryos expressed weaker but more heterogenous plasticity than older life stages, with numerous responses appearing as non‐adaptive. While developmental temperatures did not have persistent effects on thermal tolerance overall, persistent effects were vastly under‐studied, and their direction and magnitude varied with ontogeny. Embryonic stages may represent a critical window of vulnerability to changing environments and we urge researchers to consider early life stages when assessing the climate vulnerability of ectotherms. Overall, our synthesis suggests that developmental changes in thermal tolerance rarely reach levels of perfect compensation and may provide limited benefit in changing environments.

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Positive Effects of Acclimation Temperature on the Critical Thermal Maxima of Ambystoma mexicanum and Xenopus laevis

Cited by 3 publications

References 25 publications

More time for aliens? Performance shifts lead to increased activity time budgets propelling invasion success

More time for aliens? Performance shifts lead to increased activity time budgets propelling invasion success

A comprehensive database of amphibian heat tolerance

Developmental plasticity in thermal tolerance: Ontogenetic variation, persistence, and future directions

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