Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/51725
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dc.contributor.authorGeiser, Fritzen
dc.contributor.authorWen, Jingen
dc.contributor.authorSukhchuluun, Gansukhen
dc.contributor.authorChi, Qing-Shengen
dc.contributor.authorWang, De-Huaen
dc.date.accessioned2022-04-26T05:38:19Z-
dc.date.available2022-04-26T05:38:19Z-
dc.date.issued2019-04-24-
dc.identifier.citationFrontiers in Physiology, v.10, p. 1-10en
dc.identifier.issn1664-042Xen
dc.identifier.urihttps://hdl.handle.net/1959.11/51725-
dc.description.abstractMost mammals and birds are altricial, small and naked at birth/hatching. They attain endothermic thermoregulation at a fraction of their adult size at a vulnerable stage with high heat loss when many could profit from using torpor for energy conservation. Nevertheless, detailed data on the interrelations between torpor expression and development of endothermic thermoregulation are currently restricted to <0.1% of extant endotherms. We investigated at what age and body mass (BM) desert hamsters (<i>Phodopus roborovskii</i>), wild-caught in Inner Mongolia and born in autumn/early winter when environmental temperatures in the wild begin to decrease, are able to defend their body temperature (T<sub>b</sub>) at an ambient temperature (T<sub>a</sub>) of ~21°C and how soon thereafter they could express torpor. Measurements of surface temperatures via infrared thermometer and thermal camera show that although neonate hamsters (BM 0.9 ± 0.1 g) cooled rapidly to near T<sub>a</sub>, already on day 15 (BM 5.5 ± 0.2 g) they could defend a high and constant T<sub>b</sub>. As soon as day 16 (BM 5.8 ± 0.2 g), when their maximum activity metabolism (measured as oxygen consumption) approached maxima measured in vertebrates, animals were able to enter torpor for several hours with a reduction of metabolism by >90%, followed by endothermic arousal. Over the next weeks, torpor depth and duration decreased together with a reduction in resting metabolic rate at T<sub>a</sub> 30–32◦C. Our data show that development of endothermy and torpor expression in this altricial hamster is extremely fast. The results suggest that precocious torpor by juvenile hamsters in autumn and winter is an important survival tool in their vast and harsh Asian desert habitats, but likely also for many other small mammals and birds worldwide.en
dc.languageenen
dc.publisherFrontiers Research Foundationen
dc.relation.ispartofFrontiers in Physiologyen
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.titlePrecocious Torpor in an Altricial Mammal and the Functional Implications of Heterothermy During Developmenten
dc.typeJournal Articleen
dc.identifier.doi10.3389/fphys.2019.00469en
dcterms.accessRightsUNE Greenen
local.contributor.firstnameFritzen
local.contributor.firstnameJingen
local.contributor.firstnameGansukhen
local.contributor.firstnameQing-Shengen
local.contributor.firstnameDe-Huaen
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.publisher.placeSwitzerlanden
local.identifier.runningnumber469en
local.format.startpage1en
local.format.endpage10en
local.identifier.scopusid85068363424en
local.peerreviewedYesen
local.identifier.volume10en
local.access.fulltextYesen
local.contributor.lastnameGeiseren
local.contributor.lastnameWenen
local.contributor.lastnameSukhchuluunen
local.contributor.lastnameChien
local.contributor.lastnameWangen
dc.identifier.staffune-id:fgeiseren
local.profile.orcid0000-0001-7621-5049en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:1959.11/51725en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitlePrecocious Torpor in an Altricial Mammal and the Functional Implications of Heterothermy During Developmenten
local.relation.fundingsourcenoteOur study was financially supported by grants from the National Natural Science Foundation of China to Q-SC (31470473) and a Chinese Academy of Sciences Fellowship to FG.en
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorGeiser, Fritzen
local.search.authorWen, Jingen
local.search.authorSukhchuluun, Gansukhen
local.search.authorChi, Qing-Shengen
local.search.authorWang, De-Huaen
local.open.fileurlhttps://rune.une.edu.au/web/retrieve/e59680f5-2a07-4499-952b-dc61934c8985en
local.uneassociationYesen
local.atsiresearchNoen
local.sensitive.culturalNoen
local.identifier.wosid000465670800001en
local.year.published2019en
local.fileurl.openhttps://rune.une.edu.au/web/retrieve/e59680f5-2a07-4499-952b-dc61934c8985en
local.fileurl.openpublishedhttps://rune.une.edu.au/web/retrieve/e59680f5-2a07-4499-952b-dc61934c8985en
local.subject.for2020310907 Animal physiological ecologyen
local.subject.for2020310912 Comparative physiologyen
local.subject.seo2020180606 Terrestrial biodiversityen
Appears in Collections:Journal Article
School of Environmental and Rural Science
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