Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/20417
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dc.contributor.authorRuf, Thomasen
dc.contributor.authorGeiser, Fritzen
dc.date.accessioned2017-04-12T15:06:00Z-
dc.date.issued2015-
dc.identifier.citationBiological Reviews, 90(3), p. 891-926en
dc.identifier.issn1469-185Xen
dc.identifier.issn1464-7931en
dc.identifier.urihttps://hdl.handle.net/1959.11/20417-
dc.description.abstractMany birds and mammals drastically reduce their energy expenditure during times of cold exposure, food shortage, or drought, by temporarily abandoning euthermia, i.e. the maintenance of high body temperatures. Traditionally, two different types of heterothermy, i.e. hypometabolic states associated with low body temperature (torpor), have been distinguished: daily torpor, which lasts less than 24 h and is accompanied by continued foraging, versus hibernation, with torpor bouts lasting consecutive days to several weeks in animals that usually do not forage but rely on energy stores, either food caches or body energy reserves. This classification of torpor types has been challenged, suggesting that these phenotypes may merely represent extremes in a continuum of traits. Here, we investigate whether variables of torpor in 214 species (43 birds and 171 mammals) form a continuum or a bimodal distribution. We use Gaussian-mixture cluster analysis as well as phylogenetically informed regressions to quantitatively assess the distinction between hibernation and daily torpor and to evaluate the impact of body mass and geographical distribution of species on torpor traits. Cluster analysis clearly confirmed the classical distinction between daily torpor and hibernation. Overall, heterothermic endotherms tend to be small; hibernators are significantly heavier than daily heterotherms and also are distributed at higher average latitudes (~35°) than daily heterotherms (~25°). Variables of torpor for an average 30 g heterotherm differed significantly between daily heterotherms and hibernators. Average maximum torpor bout duration was >30-fold longer, and mean torpor bout duration >25-fold longer in hibernators. Mean minimum body temperature differed by ~13°C, and the mean minimum torpor metabolic rate was ~35% of the basal metabolic rate (BMR) in daily heterotherms but only 6% of BMR in hibernators. Consequently, our analysis strongly supports the view that hibernators and daily heterotherms are functionally distinct groups that probably have been subject to disruptive selection. Arguably, the primary physiological difference between daily torpor and hibernation, which leads to a variety of derived further distinct characteristics, is the temporal control of entry into and arousal from torpor, which is governed by the circadian clock in daily heterotherms, but apparently not in hibernators.en
dc.languageenen
dc.publisherWiley-Blackwell Publishing Ltden
dc.relation.ispartofBiological Reviewsen
dc.titleDaily torpor and hibernation in birds and mammalsen
dc.typeJournal Articleen
dc.identifier.doi10.1111/brv.12137en
dcterms.accessRightsGolden
dc.subject.keywordsAnimal Physiological Ecologyen
local.contributor.firstnameThomasen
local.contributor.firstnameFritzen
local.subject.for2008060806 Animal Physiological Ecologyen
local.subject.seo2008970106 Expanding Knowledge in the Biological Sciencesen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailfgeiser@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20170331-112938en
local.publisher.placeUnited Kingdomen
local.format.startpage891en
local.format.endpage926en
local.identifier.scopusid84937163330en
local.peerreviewedYesen
local.identifier.volume90en
local.identifier.issue3en
local.access.fulltextYesen
local.contributor.lastnameRufen
local.contributor.lastnameGeiseren
dc.identifier.staffune-id:fgeiseren
local.profile.orcid0000-0001-7621-5049en
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:20613en
dc.identifier.academiclevelAcademicen
local.title.maintitleDaily torpor and hibernation in birds and mammalsen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorRuf, Thomasen
local.search.authorGeiser, Fritzen
local.uneassociationUnknownen
local.identifier.wosid000357888200012en
local.year.published2015en
local.subject.for2020310907 Animal physiological ecologyen
local.subject.seo2020280102 Expanding knowledge in the biological sciencesen
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