Body temperature of free-ranging koalas (Phascolarctos cinereus) in south-east Queensland
| Autor: | Amber Gillett, Sean FitzGibbon, D. Adam, Gordon C. Grigg, Allan Lisle, John B. Gaughan, Lyn A. Beard, B. J. Barth, V. Nicolson, William Ellis, Stephen D. Johnston |
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| Rok vydání: | 2019 |
| Předmět: |
Atmospheric Science
010504 meteorology & atmospheric sciences Health Toxicology and Mutagenesis Context (language use) Thermal neutral zone 01 natural sciences Body Temperature 03 medical and health sciences 0302 clinical medicine Animal science Phascolarctos cinereus biology.animal South east Animals 0105 earth and related environmental sciences 030203 arthritis & rheumatology Ecology biology Free ranging Diurnal rhythms Environmental science Queensland Seasons Phascolarctidae Nadir (topography) Field conditions |
| Zdroj: | International journal of biometeorology. 64(8) |
| ISSN: | 1432-1254 |
| Popis: | The distribution of the koala (Phascolarctos cinereus) in Queensland is predicted to contract as a result of climate change, driven by the frequency, intensity and duration of heatwaves and drought. However, little is known about the physiological responses of this species to environmental extremes under field conditions. This study aimed to establish the efficacy of surgically implanted thermal radio transmitters and data loggers to measure the body temperature of free-ranging koalas across a range of environmental conditions and ambient temperatures. Five free-ranging koalas in southeast Queensland were implanted with thermal transmitters and data loggers waxed together as a single package. Body temperatures were recorded for variable periods ranging from 3 to 12 months. Diurnal rhythms in body temperature were detected irrespective of season. The long-term diurnal body temperature peak for all koalas occurred between 16:00 and 17:00 h and body temperature was 36.7-36.9 °C, the long-term nadir occurred between 07:00 and 08:00 h and body temperature was 35.4-35.7 °C. Koala body temperatures as low as 34.2 °C and as high as 39.0 °C were recorded. Thermolability became apparent when ambient temperatures were outside the deduced thermal neutral zone for koalas (14.5-24.5 °C): heat was accumulated during the day and dissipated during the cool of the night. While this study is the first to report on body temperature of free-ranging koalas in their normal behavioural context, further investigations are necessary to determine the physiological boundaries of the thermal niche for this species, in order to better equip models that will more accurately predict the impacts of climate change on koalas. |
| Databáze: | OpenAIRE |
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