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Numerous cold arousals and rare arousal cascades as a hibernation strategy in European Myotis bats

J. Blažek, J. Zukal, H. Bandouchova, H. Berková, V. Kovacova, N. Martínková, J. Pikula, Z. Řehák, P. Škrabánek, T. Bartonička,

. 2019 ; 82 (-) : 150-156. [pub] 20190415

Jazyk angličtina Země Velká Británie

Typ dokumentu časopisecké články

Perzistentní odkaz   https://www.medvik.cz/link/bmc19044803

Hibernating bats optimise the duration of torpor bouts and arousals in relation to hibernaculum microclimatic conditions and fat reserves. Clustering has significant physiological and ecological benefits, promoting successful hibernation of individuals. Such aggregations may help maintain optimal temperatures, allowing better energy utilisation than in solitarily bats. However, aroused bats in a cluster could conceivably disturb those still hibernating, starting an energy-demanding arousal process. Our study was conducted over two winters in two different hibernacula (cave and mine) in the Czech Republic, where Greater mouse-eared bats (Myotis myotis) have previously been diagnosed with white-nose syndrome. In 118 arousal episodes we recorded 193 individual arousals in which a warming phase was observed, 135 (69.9%) being cold arousals, where bats ceased increasing their body temperatures at ≤ 10 °C. The remaining arousals were standard normothermic arousals, where body (fur) surface temperatures reached > 20 °C. Cold arousals occurred during the mid- and late hibernation periods, suggesting they were a response to disturbance by a neighbour in the same cluster. Arousal cascades, where bats aroused in series, were rare (12.7%) and reached a maximum in mid-January. Our data suggest that Myotis bats prolong their torpor bouts using numerous cold arousals but few arousal cascades. Upon arrival of a bat, the clustered bats show tolerance to disturbing by conspecifics.

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$a Hibernating bats optimise the duration of torpor bouts and arousals in relation to hibernaculum microclimatic conditions and fat reserves. Clustering has significant physiological and ecological benefits, promoting successful hibernation of individuals. Such aggregations may help maintain optimal temperatures, allowing better energy utilisation than in solitarily bats. However, aroused bats in a cluster could conceivably disturb those still hibernating, starting an energy-demanding arousal process. Our study was conducted over two winters in two different hibernacula (cave and mine) in the Czech Republic, where Greater mouse-eared bats (Myotis myotis) have previously been diagnosed with white-nose syndrome. In 118 arousal episodes we recorded 193 individual arousals in which a warming phase was observed, 135 (69.9%) being cold arousals, where bats ceased increasing their body temperatures at ≤ 10 °C. The remaining arousals were standard normothermic arousals, where body (fur) surface temperatures reached > 20 °C. Cold arousals occurred during the mid- and late hibernation periods, suggesting they were a response to disturbance by a neighbour in the same cluster. Arousal cascades, where bats aroused in series, were rare (12.7%) and reached a maximum in mid-January. Our data suggest that Myotis bats prolong their torpor bouts using numerous cold arousals but few arousal cascades. Upon arrival of a bat, the clustered bats show tolerance to disturbing by conspecifics.
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$a Zukal, Jan $u Department of Botany and Zoology, Masaryk University, Brno, Czech Republic; Institute of Vertebrate Biology of the Czech Academy of Sciences v.v.i., Brno, Czech Republic.
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$a Bandouchova, Hana $u Department of Ecology and Diseases of Game, Fish and Bees, University of Veterinary and Pharmaceutical Sciences Brno, Brno, Czech Republic.
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$a Berková, Hana $u Institute of Vertebrate Biology of the Czech Academy of Sciences v.v.i., Brno, Czech Republic.
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$a Kovacova, Veronika $u Department of Ecology and Diseases of Game, Fish and Bees, University of Veterinary and Pharmaceutical Sciences Brno, Brno, Czech Republic.
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$a Martínková, Natália $u Institute of Vertebrate Biology of the Czech Academy of Sciences v.v.i., Brno, Czech Republic; Institute of Biostatistics and Analyses, Masaryk University, Brno, Czech Republic.
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$a Pikula, Jiri $u Department of Ecology and Diseases of Game, Fish and Bees, University of Veterinary and Pharmaceutical Sciences Brno, Brno, Czech Republic.
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$a Řehák, Zdeněk $u Department of Botany and Zoology, Masaryk University, Brno, Czech Republic.
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$a Škrabánek, Pavel $u Faculty of Electrical Engineering and Informatics, University of Pardubice, Pardubice, Czech Republic.
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$a Bartonička, Tomáš $u Department of Botany and Zoology, Masaryk University, Brno, Czech Republic. Electronic address: bartonic@sci.muni.cz.
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