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Some like it cold: summer torpor by freetail bats in the Australian arid zone
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Some like it cold: summer torpor by freetail bats in the Australian arid zone
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Journal Article
Some like it cold: summer torpor by freetail bats in the Australian arid zone
2013
Overview
Bats are among the most successful groups of Australian arid-zone mammals and, therefore, must cope with pronounced seasonal fluctuations in ambient temperature (
T
a
), food availability and unpredictable weather patterns. As knowledge about the energy conserving strategies in desert bats is scant, we used temperature-telemetry to quantify the thermal physiology of tree-roosting inland freetail bats (
Mormopterus
species 3, 8.5 g,
n
= 8) at Sturt National Park over two summers (2010–2012), when
T
a
was high and insects were relatively abundant. Torpor use and activity were affected by
T
a
. Bats remained normothermic on the warmest days; they employed one “morning” torpor bout on most days and typically exhibited two torpor bouts on the coolest days. Overall, animals employed torpor on 67.9 % of bat-days and torpor bout duration ranged from 0.5 to 39.3 h. At any given
T
a
, torpor bouts were longer in
Mormopterus
than in bats from temperate and subtropical habitats. Furthermore, unlike bats from other climatic regions that used only partial passive rewarming,
Mormopterus
aroused from torpor using either almost entirely passive (68.9 % of all arousals) or active rewarming (31.1 %). We provide the first quantitative data on torpor in a free-ranging arid-zone molossid during summer. They demonstrate that this desert bat uses torpor extensively in summer and often rewarms passively from torpor to maximise energy and water conservation.
