Body temperature variation of free-ranging and captive southern brown bandicoots Isoodon obesulus (Marsupialia: Peramelidae) |
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Authors: | Lisa Warnecke Philip C Withers Elke Schleucher Shane K Maloney |
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Institution: | 1. Centre for Behavioural and Physiological Ecology, Zoology, University of New England, Armidale, NSW 2351, Australia;2. Zoology, School of Animal Biology M092, University of Western Australia, Stirling Highway, Crawley, WA 6009, Australia;3. Metabolic Physiology, Institute of Ecology, Evolution and Diversity, Johann Wolfgang Goethe—Universität, Siesmayerstrasse 70, 60323 Frankfurt am Main, Germany;4. Physiology, School of Biomedical, Biomolecular and Chemical Sciences, University of Western Australia, Stirling Highway, Crawley, WA 6009, Australia |
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Abstract: | To investigate patterns of thermoregulation in free-ranging and captive southern brown bandicoots Isoodon obesulus, we measured abdominal body temperature (Tb) of five free-ranging bandicoots over 42 days using implanted data loggers and Tb of three captive bandicoots over 3 months using implanted temperature-sensitive radio transmitters. Bandicoots in the wild had a mean Tb of 36.5±1.0 °C (range 33.4–39.8 °C) and showed a pronounced nychthemeral pattern with two distinct temperature phases. Tb increased at 13:30±2.6 h each day and remained high for 10.65±2.07 h, suggesting a crepuscular and early evening activity pattern. Daily Tb variation of I. obesulus would save considerable energy by reducing daytime thermoregulatory costs in the wild. Captive bandicoots had a similar mean body temperature (36.9±0.2°C) and range (33.0–39.9°C) as free-ranging bandicoots. However, the nychthemeral Tb pattern of captive bandicoots was different from free-ranging bandicoots, with a less pronounced daily cycle and the nocturnal rise in Tb occurring mainly at sunset and the daily decline occurring mainly at dawn. |
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Keywords: | Thermoregulation Body temperature Daily fluctuation Bandicoots Nychthemeral rhythm Free ranging Captivity |
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