Strong acclimation effect of temperature and humidity on heat tolerance of the Arctic collembolan Megaphorura arctica.

Autor:	Christoffersen SN; Department of Chemistry and Bioscience, Aalborg University, 9220 Aalborg East, Denmark., Pertoldi C; Department of Chemistry and Bioscience, Aalborg University, 9220 Aalborg East, Denmark.; Aalborg Zoo, Mølleparkvej 63, 9000 Aalborg, Denmark., Sørensen JG; Department of Biology, Aarhus University, 8000 Aarhus C, Denmark., Kristensen TN; Department of Chemistry and Bioscience, Aalborg University, 9220 Aalborg East, Denmark., Bruhn D; Department of Chemistry and Bioscience, Aalborg University, 9220 Aalborg East, Denmark., Bahrndorff S; Department of Chemistry and Bioscience, Aalborg University, 9220 Aalborg East, Denmark.
Jazyk:	angličtina
Zdroj:	The Journal of experimental biology [J Exp Biol] 2024 Jun 15; Vol. 227 (12). Date of Electronic Publication: 2024 Jun 18.
DOI:	10.1242/jeb.247394
Abstrakt:	The Arctic is a highly variable environment in which extreme daily and seasonal temperature fluctuations can occur. With climate change, an increase in the occurrence of extreme high temperatures and drought events is expected. While the effects of cold and dehydration stress on polar arthropods are well studied in combination, little is known about how these species respond to the combined effects of heat and dehydration stress. In this paper, we investigated how the heat tolerance of the Arctic collembola Megaphorura arctica is affected by combinations of different temperature and humidity acclimation regimes under controlled laboratory conditions. The effect of acclimation temperature was complex and highly dependent on both acclimation time and temperature, and was found to have a positive, negative or no effect depending on experimental conditions. Further, we found marked effects of the interaction between temperature and humidity on heat tolerance, with lower humidity severely decreasing heat tolerance when the acclimation temperature was increased. This effect was more pronounced with increasing acclimation time. Lastly, the effect of acclimation on heat tolerance under a fluctuating temperature regime was dependent on acclimation temperature and time, as well as humidity levels. Together, these results show that thermal acclimation alone has moderate or no effect on heat tolerance, but that drought events, likely to be more frequent in the future, in combination with high temperature stress can have large negative impacts on heat tolerance of some Arctic arthropods. Competing Interests: Competing interests The authors declare no competing or financial interests. (© 2024. Published by The Company of Biologists Ltd.)
Databáze:	MEDLINE
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