Journal of Thermal Biology

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ISSN : 0306-4565
Published by: Elsevier BV (10.1016)
Total articles ≅ 4,255
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Diogo Moraes Cardoso, Paula Costa Cardeal, Kamilla Ribas Soares, Lorena Salim Sousa, , ,
Published: 7 December 2021
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, Juan Carlos Acosta, Vanesa Astudillo, Mariela Córdoba
Published: 5 December 2021
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Peter Delgado-Suazo,
Published: 4 December 2021
Abstract:
In Puerto Rico, an island threatened by climate warming, only one of two species of frogs that share part of their distribution has undergone a recent range contraction to higher elevations. We questioned if differences in their physiological response to temperature and dehydration might explain this distributional change. We studied a lowland and a highland population of Eleutherodactylus coqui, a widespread generalist, and E. portoricensis, an endangered species that is currently found only above 600 m. We compared various physiological aspects: operative temperature; temperature selection; critical temperatures; and their response to jumping performance tests at various thermal and hydric regimes. Results revealed that E. portoricensis had the highest CTmin and lowest CTmax and selected a cooler range of temperatures from the experimental gradient. Jumping performance increased with temperature for the three populations until attaining maximum performance. Afterwards, performance dropped drastically until reaching CTmax. Dehydration had a negative effect on performance for both species, particularly on maximum performance. This effect was greatest for E. portoricensis, followed by high-elevation E. coqui. The significantly greater thermo-hydric physiological limitations in this species may explain its recent range contraction, potentially, as a response to climate warming. Low-elevation E. coqui had the lowest operative warming tolerance and was the only population to select temperatures like those encountered in their environment, indicating it may be narrowly adapted to local thermal conditions and thus, also vulnerable to climate change. Our results point towards plasticity in the response of E. coqui to varying climatic conditions, and present evidence of different physiological responses between closely related species at the same locality. This work highlights the importance of studying the combined effects of temperature and hydration to understand the response of ectotherms to warming environments and presents further evidence that desiccation may be a limiting factor determining which species may survive.
Rachel A. Farrow, D. Charles Deeming,
Published: 4 December 2021
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, Martina Gáliková
Published: 2 December 2021
Abstract:
In their natural environments, animals have to cope with fluctuations in numerous abiotic and biotic factors, and phenotypic plasticity can facilitate survival under such variable conditions. However, organisms may differ substantially in the ability to adjust their phenotypes in response to external factors. Here, we investigated how developmental temperature affects the thermal performance curve for locomotor activity in adult fruit flies (Drosophila melanogaster). We examined the thermal dependence of spontaneous activity in individuals originating from two natural populations (from tropical (India) and temperate climate zone (Slovakia)) that developed at three different temperatures (19 °C, 25 °C, and 29 °C). Firstly, we found that developmental temperature has a significant impact on overall activity – flies that developed at high temperature (29 °C) were, on average, less active than individuals that developed at lower temperatures. Secondly, developmental acclimation had a population-specific effect on the thermal optimum for activity. Whereas the optimal temperature was not affected by thermal conditions experienced during development in flies from India, developmental temperature shifted thermal optimum in flies from Slovakia. Thirdly, high developmental temperature broadened performance breadth in flies from the Indian population but narrowed it in individuals from the Slovak population. Finally, we did not detect a consistent effect of acclimation temperature on circadian rhythms of spontaneous activity. Altogether, our results demonstrate that developmental temperature can alter different parameters (maximum performance, thermal optimum, performance breadth) of the thermal performance curve for spontaneous activity. Since adult fruit flies are highly vagile, this sensitivity of locomotion to developmental conditions may be an important factor affecting fitness in changing environments.
Madalena Missionário, Joana Filipa Fernandes, Margarida Travesso, , ,
Published: 1 December 2021
Journal of Thermal Biology, Volume 103; https://doi.org/10.1016/j.jtherbio.2021.103151

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