Document Detail

Thermoregulatory variation among populations of bats along a latitudinal gradient.
MedLine Citation:
PMID:  20213177     Owner:  NLM     Status:  MEDLINE    
Most studies of hibernation physiology sample individuals from populations within a single geographic area, yet some species have large ranges meaning populations likely experience area-specific levels of energetic challenges. As well, few studies have assessed within-season variation. Since physiological adjustments often are influenced by environmental factors, and the types of environments vary with geography, we expected variance in hibernation patterns among geographically separated populations. Our specific goal was to measure intraspecific variation in torpid metabolic rate (TMR) and body temperature (T (b)) as a function of ambient temperature (T (a)) for a non-migratory and migratory species to determine whether there is a continuum in physiological responses based on latitude. We chose big brown (Eptesicus fuscus) and eastern red bats (Lasiurus borealis) as model species and sampled individuals from populations throughout each species' winter range. In both species, individuals from southern populations maintained higher TMR at cooler T (a)s and lower TMR at warmer T (a)s than those from northern populations. Big brown bats from southern populations regulated T (b) during torpor at higher levels and there was no significant difference in T (b) between populations of eastern red bats. Although metabolic responses were similar across the gradient between species, the effect was more dramatic in big brown bats. Our data demonstrate a continuum in thermoregulatory response, ranging from classic hibernation in northern populations to a pattern more akin to daily torpor in southern populations. Our research highlights the potential usefulness of bats as model organisms to address questions about within-species physiological variation in wild populations.
Miranda B Dunbar; R Mark Brigham
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-03-06
Journal Detail:
Title:  Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology     Volume:  180     ISSN:  1432-136X     ISO Abbreviation:  J. Comp. Physiol. B, Biochem. Syst. Environ. Physiol.     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-07-14     Completed Date:  2010-10-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8413200     Medline TA:  J Comp Physiol B     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  885-93     Citation Subset:  IM    
Biology Department, University of Regina, 3737 Wascana Parkway, Regina, Saskatchewan, S4S 0A2, Canada.
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MeSH Terms
Adaptation, Physiological / physiology
Basal Metabolism / physiology
Body Temperature / physiology
Body Temperature Regulation / physiology*
Chiroptera / classification,  physiology*
Emigration and Immigration
Hibernation / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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