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Energy metabolism and evaporative water loss in the European free-tailed bat and Hemprich's long-eared bat (Microchiroptera): species sympatric in the Negev Desert

Marom, Sagi, Korine, Carmi, Wojciechowski, Michael S., Tracy, Christopher R. and Pinshow, Berry (2006). Energy metabolism and evaporative water loss in the European free-tailed bat and Hemprich's long-eared bat (Microchiroptera): species sympatric in the Negev Desert. Physiological and Biochemical Zoology,79(5):944-956.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 13 times in Scopus Article | Citations

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IRMA ID 78672763xPUB26
Title Energy metabolism and evaporative water loss in the European free-tailed bat and Hemprich's long-eared bat (Microchiroptera): species sympatric in the Negev Desert
Author Marom, Sagi
Korine, Carmi
Wojciechowski, Michael S.
Tracy, Christopher R.
Pinshow, Berry
Journal Name Physiological and Biochemical Zoology
Publication Date 2006
Volume Number 79
Issue Number 5
ISSN 1537-5293   (check CDU catalogue  open catalogue search in new window)
Scopus ID 2-s2.0-33748803900
Start Page 944
End Page 956
Total Pages 13
Place of Publication Chicago, IL, United States
Publisher The University of Chicago Press
Field of Research 0606 - Physiology
0608 - Zoology
1116 - Medical Physiology
HERDC Category C1 - Journal Article (DEST)
Abstract We compared the thermoregulatory abilities of two insectivorous bat species, Tadarida teniotis (mean body mass 32 g) and Otonycteris hemprichii (mean body mass 25 g), that are of different phylogenetic origins and zoogeographic distributions but are sympatric in the Negev Desert. At night, both were normothermic. By day, both were torpid when exposed to ambient temperatures (T-a) below 25 degrees C, with concomitant adjustments in metabolic rate (MR). Otonycteris hemprichii entered torpor at higher T-a than T. teniotis, and, when torpid, their body temperatures (T-b) were 1 degrees-2 degrees C and 5 degrees-8 degrees C above T-a, respectively; MR was correspondingly reduced. At night, the lower critical temperature of T. teniotis was 31.5 degrees C, and that of O. hemprichii was 33 degrees C. Mean nocturnal thermoneutral MR of T. teniotis was 37% greater than that of O. hemprichii. At high T-a, evaporative water loss (EWL) increased markedly in both species, but it was significantly higher in T. teniotis above 38 degrees C. In both species, the dry heat transfer coefficient (thermal conductance) followed the expected pattern for small mammals, by day and by night. Total EWL was notably low in normothermic and torpid animals of both species, much lower than values reported for other bats, indicating efficient water conservation mechanisms in the study species. Comparing thermoregulatory abilities suggests that O. hemprichii is better adapted to hot, arid environments than T. teniotis, which may explain its wider desert distribution. By both standard and phylogenetically informed ANCOVA, we found no differences in basal metabolic rate (BMR) between desert and nondesert species of insectivorous bats, substantiating previous studies suggesting that low BMR is a characteristic common to insectivorous bats in general.
DOI http://dx.doi.org/10.1086/505999   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)


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