NDLI: Thermoregulatory variation among populations of bats along a latitudinal gradient

Content Provider	Springer Nature Link
Author	Dunbar, Miranda B. Brigham, R. Mark
Copyright Year	2010
Abstract	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 as and lower TMR at warmer T as 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.
Starting Page	885
Ending Page	893
Page Count	9
File Format	PDF
ISSN	01741578
Journal	Journal of Comparative Physiology B
Volume Number	180
Issue Number	6
e-ISSN	1432136X
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-03-06
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Energy Geographic region Hibernation Population Temperature Torpor Animal Physiology Biomedicine general Zoology Human Physiology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Physiology Biochemistry Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Endocrinology

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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