Individual and demographic consequences of reduced body condition following repeated exposure to high temperatures

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dc.creatorGardner, Janet L
dc.creatorAmano, Tatsuya
dc.creatorSutherland, William J
dc.creatorClayton, Mark
dc.creatorPeters, Anne
dc.date2016-01-13T11:08:29Z
dc.date2016-01-13T11:08:29Z
dc.date2015-10-01
dc.date.accessioned2026-08-03T03:15:50Z
dc.descriptionAlthough the lethal consequences of extreme heat are increasingly reported in the literature, the fitness costs of exposure to sub-lethal high air temperatures, typically identified in the 30-40°C range, are poorly understood. We examine the effect of high (≥35°C) daily maxima on body condition of a semi-arid population of white-plumed honeyeaters Ptilotula penicillatus monitored between 1986 and 2012. During this 26 year period temperature has risen, on average, by 0.06°C each year at the site, the frequency of days with thermal maxima ≥35°C has increased and rainfall has declined. Exposure to high temperatures affected body condition of white-plumed honeyeaters, but only in low rainfall conditions. There was no effect of a single day of exposure to temperatures ≥35°C but repeated exposure was associated with reduced body condition: 3.0% reduction in body mass per day of exposure. Rainfall in the previous 30 days ameliorated these effects, with reduced condition evident only in dry conditions. Heat-exposed males with reduced body condition were less likely to be recaptured at the start of the following spring; they presumably died. Heat-exposed females, regardless of body condition, showed lower survival than exposed males, possibly due to their smaller body mass. The higher mortality of females and smaller males exposed to temperatures ≥35°C may have contributed to the increase in mean body size of this population over 23 years. Annual survival declined across time concomitant with increasing frequency of days ≥35°C and decreasing rainfall. Our study is one of few to identify a proximate cause of climate change related mortality, and associated long-term demographic consequence. Our results have broad implications for avian communities living in arid and semi-arid regions of Australia, and other mid-latitudes regions where daily maximum temperatures already approach physiological limits in regions affected by both decreased precipitation and warming. This article is protected by copyright. All rights reserved.
dc.descriptionThe work was conducted under permits SL100167 and SL100825 issued by the Office of Environment and Heritage, National Parks and Wildlife Service (NPWS), NSW and bands were supplied by the Australian Bird and Bat Banding Scheme. We thank the many volunteer banders and NPWS staff for support. Jim Thompson provided initial statistical advice and Loeske Kruuk, Peter Marsack and Katherine Selwood useful discussion or comments on the manuscript. The work received funding from the Norman Wettenhall Foundation and the Australian Research Council (ARC, Discovery grant DP120102651). Sutherland is funded by Arcadia, Peters by an ARC Future Fellowship (FT110100505) and Amano by a Marie Curie International Incoming Fellowship.
dc.descriptionThis is the author accepted manuscript. The final version is available from Wiley via http://dx.doi.org/10.1890/15-0642
dc.formatapplication/pdf
dc.identifierGardner et al. Ecology (2015). doi: 10.1890/15-0642
dc.identifier0012-9658
dc.identifierhttps://www.repository.cam.ac.uk/handle/1810/253201
dc.identifier.urihttps://repo.dare.co.zw/handle/123456789/174659
dc.languageEnglish
dc.languageeng
dc.publisherWiley
dc.publisherhttps://doi.org/10.1890/15-0642
dc.subject3109 Zoology
dc.subject41 Environmental Sciences
dc.subject31 Biological Sciences
dc.subjectClimate-Related Exposures and Conditions
dc.subjectClimate Change
dc.titleIndividual and demographic consequences of reduced body condition following repeated exposure to high temperatures
dc.titleClimate-driven changes in body condition
dc.typeArticle

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