Physiological responses of wild zebra finches ( Taeniopygia guttata ) to heatwaves.

Autor:	Cooper CE; School of Molecular and Life Sciences, Curtin University, Perth, Western Australia 3102, Australia C.Cooper@curtin.edu.au.; Department of Biological Sciences, Macquarie University, Sydney, New South Wales, Australia., Hurley LL; Department of Biological Sciences, Macquarie University, Sydney, New South Wales, Australia., Deviche P; School of Life Sciences, Arizona State University, Tempe, AZ 85287-4501, USA., Griffith SC; Department of Biological Sciences, Macquarie University, Sydney, New South Wales, Australia.
Jazyk:	angličtina
Zdroj:	The Journal of experimental biology [J Exp Biol] 2020 Jun 17; Vol. 223 (Pt 12). Date of Electronic Publication: 2020 Jun 17.
DOI:	10.1242/jeb.225524
Abstrakt:	Desert birds inhabit hot, dry environments that are becoming hotter and drier as a consequence of climate change. Extreme weather such as heatwaves can cause mass-mortality events that may significantly impact populations and species. There are currently insufficient data concerning physiological plasticity to inform models of species' response to extreme events and develop mitigation strategies. Consequently, we examine here the physiological plasticity of a small desert bird in response to hot (mean maximum ambient temperature=42.7°C) and cooler (mean maximum ambient temperature=31.4°C) periods during a single Austral summer. We measured body mass, metabolic rate, evaporative water loss and body temperature, along with blood parameters (corticosterone, glucose and uric acid) of wild zebra finches ( Taeniopygia guttata ) to assess their physiological state and determine the mechanisms by which they respond to heatwaves. Hot days were not significant stressors; they did not result in modification of baseline blood parameters or an inability to maintain body mass, provided drinking water was available. During heatwaves, finches shifted their thermoneutral zone to higher temperatures. They reduced metabolic heat production, evaporative water loss and wet thermal conductance, and increased hyperthermia, especially when exposed to high ambient temperature. A consideration of the significant physiological plasticity that we have demonstrated to achieve more favourable heat and water balance is essential for effectively modelling and planning for the impacts of climate change on biodiversity. Competing Interests: Competing interestsThe authors declare no competing or financial interests. (© 2020. Published by The Company of Biologists Ltd.)
Databáze:	MEDLINE
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