Thermobiology, energetics and activity patterns of the Eastern tube-nosed bat (Nyctimene robinsoni) in the Australian tropics: effect of temperature and lunar cycle

The Journal of Experimental Biology
Alexander RiekFritz Geiser

Abstract

Currently, there are no data on the thermal biology of free-ranging pteropodid bats (Chiroptera). Therefore, our aim was to investigate physiological and behavioural strategies employed by the fruit bat Nyctimene robinsoni (body mass approximately 50 g) in winter in tropical Northern Queensland in relation to ambient temperature (T(a)) and the lunar cycle. Daily body temperature (T(b)) fluctuations in free-ranging bats were measured via radio-telemetry and metabolic rate was measured in captivity via open-flow respirometry (T(a), 15-30 degrees C). Free-ranging bats showed a significant 24 h circadian cycle in T(b), with the lowest T(b) at the end of the rest phase just after sunset and the highest T(b) at the end of the activity phase just before sunrise. Average daily core T(b) ranged from 34.7+/-0.6 to 37.3+/-0.8 degrees C (mean +/- s.d.) over an average daily T(a) range of 17.1+/-1.1 to 23.5+/-1.8 degrees C. T(b) never fell below 30 degrees C but T(b) was significantly reduced during the full moon period compared with that during the new moon period. T(b) was correlated with T(a) during the second half of the rest phase (P<0.001) but not during the active phase. Resting metabolic rate of bats was significantly affected by T(...Continue Reading

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Citations

Jun 28, 2011·Integrative and Comparative Biology·Andrew E McKechnie, Nomakwezi Mzilikazi
Jul 5, 2013·Proceedings. Biological Sciences·Noga Kronfeld-SchorCharlotte Helfrich-Forster
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Jul 29, 2017·Biological Reviews of the Cambridge Philosophical Society·Michel GenoudRobert D Martin
Jul 2, 2011·Integrative and Comparative Biology·Ofir LevyNoga Kronfeld-Schor

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