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Contrasting thermal strategies of montane Neotropical bats at high elevations.

Authors
  • Garin, I1
  • Chaverri, G2
  • Jimenez, L3
  • Castillo-Salazar, C4
  • Aihartza, J3
  • 1 Zoology and Animal Cell Biology, University of The Basque Country UPV/EHU, Sarriena z/g, 48940 Leioa, The Basque Country. Electronic address: [email protected]
  • 2 Recinto de Golfito, Universidad de Costa Rica, Golfito, Costa Rica. , (Costa Rica)
  • 3 Zoology and Animal Cell Biology, University of The Basque Country UPV/EHU, Sarriena z/g, 48940 Leioa, The Basque Country.
  • 4 Escuela de Biología, Universidad de Costa Rica, San Pedro, Costa Rica. , (Costa Rica)
Type
Published Article
Journal
Journal of Thermal Biology
Publisher
Elsevier
Publication Date
Dec 01, 2018
Volume
78
Pages
352–355
Identifiers
DOI: 10.1016/j.jtherbio.2018.10.017
PMID: 30509657
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

In the Neotropics, captive vespertilionid bats substantially reduce their metabolic rate at low ambient temperatures, similar to their temperate counterparts, whereas the ability of phyllostomids to lower metabolic rate seems to be more limited, even in mountain species. Nevertheless, field data on the thermal behaviour of syntopic individuals from these two families is lacking. Consequently, we aimed to test whether torpor was more common and deeper in vesper bats compared to leaf-nosed bats by studying skin temperature (Tsk) variation in individuals experiencing the same environmental conditions at a mountain area. Bats experienced ambient temperatures below 15 °C. Average Tsk was 10 °C in Myotis oxyotus gardneri (Vespertilionidae) during the day, while Sturnira burtonlimi (Phyllostomidae) regulated diurnal Tsk above 30 °C. Constant food availability may explain why diurnal Sturnira burtonlimi pay the high energetic cost required to remain normothermic and to defend a wide Ta-Tsk gap but further studies are needed to elucidate additional strategies that may be employed by these bats to reduce the energetic demands of normothermy. Our study shows that the contrasting thermal strategies and torpor use adopted by vespertilionid insectivores and phyllostomid frugivores in captive settings also occur in free-ranging conditions, thus providing a basis to develop further studies with predictions more accurately rooted in field data. Copyright © 2018 Elsevier Ltd. All rights reserved.

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