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15 July 2016 Activity patterns and torpor in two free-ranging carnivorous marsupials in arid Australia in relation to precipitation, reproduction, and ground cover
Gerhard Körtner, Alexander Riek, Chris R. Pavey, Fritz Geiser
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Abstract

It is generally assumed that in unpredictable environments, the use of daily torpor and its interaction with daily activity are largely dependent on environmental thermal conditions and resource availability. Using temperature telemetry, we compared the thermal biology and activity patterns of 2 species of mulgaras (Dasycercus blythi and D. cristicauda) at 3 sites of different habitat types in central Australia. The work compared a dry period with a wet period (resource pulse). The most obvious functional difference among populations was observed in the timing of the onset of activity, which began significantly earlier in dense unburned spinifex (on average 17.7 min before sunset) than in burned spinifex (4.6 min after sunset) or on gibber plains (21.8 min after sunset). However, although the seasonal expression of torpor differed significantly between males and females, torpor use as well as seasonal timing was similar among sites and periods despite differences in rainfall and habitat. It appears that predominantly reproductive activity governed torpor depth and duration in all measured populations and both species. Our data suggest that while the timing of activity is modulated by the amount of vegetation cover and thus protection from diurnal predators, torpor expression and winter reproduction in mulgaras are functionally linked and surprisingly more or less independent of apparent resource availability. Consequently, in mulgaras, daily torpor does not seem to be employed in response to immediate energy shortage but more likely to allow reallocation of energy and nutrients towards reproduction.

© 2016 American Society of Mammalogists, www.mammalogy.org
Gerhard Körtner, Alexander Riek, Chris R. Pavey, and Fritz Geiser "Activity patterns and torpor in two free-ranging carnivorous marsupials in arid Australia in relation to precipitation, reproduction, and ground cover," Journal of Mammalogy 97(6), 1555-1564, (15 July 2016). https://doi.org/10.1093/jmammal/gyw113
Received: 13 December 2015; Accepted: 10 June 2016; Published: 15 July 2016
JOURNAL ARTICLE
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KEYWORDS
activity
Climate
desert
marsupial
rain
reproduction
torpor
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