Daily and annual cycles in thermoregulatory behaviour and cardio-respiratory physiology of black and white tegu lizards

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dc.contributor.authorSanders, Colin E.
dc.contributor.authorTattersall, Glenn J.
dc.contributor.authorReichert, Michelle
dc.contributor.authorAndrade, Denis V. [UNESP]
dc.contributor.authorAbe, Augusto S. [UNESP]
dc.contributor.authorMilsom, William K.
dc.contributor.institutionUniv British Columbia
dc.contributor.institutionBrock Univ
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2018-11-26T16:17:19Z
dc.date.available2018-11-26T16:17:19Z
dc.date.issued2015-12-01
dc.description.abstractThis study was designed to determine the manner in which metabolism is suppressed during dormancy in black and white tegu lizards (Tupinambis merianae). To this end, heart rate (f (H)), respiration rate (f (R)), and deep body temperature (T (b)) were continuously monitored in outdoor enclosures by radio-telemetry for nine months. There was a continuous decline in nighttime breathing and heart rate, at constant T (b), throughout the late summer and fall suggestive of an active metabolic suppression that developed progressively at night preceding the entrance into dormancy. During the day, however, the tegus still emerged to bask. In May, when the tegus made a behavioural commitment to dormancy, T (b) (day and night) fell to match burrow temperature, accompanied by a further reduction in f (H) and f (R). Tegus, under the conditions of this study, did arouse periodically during dormancy. There was a complex interplay between changes in f (H) and T (b) associated with the direct effects of temperature and the indirect effects of thermoregulation, activity, and changes in metabolism. This interplay gave rise to a daily hysteresis in the f (H)/T (b) relationship reflective of the physiological changes associated with warming and cooling as preferred T (b) alternated between daytime and nighttime levels. The shape of the hysteresis curve varied with season along with changes in metabolic state and daytime and nighttime body temperature preferences.en
dc.description.affiliationUniv British Columbia, Dept Zool, Vancouver, BC V6T 1Z4, Canada
dc.description.affiliationBrock Univ, Dept Biol Sci, St Catharines, ON L2S 3A1, Canada
dc.description.affiliationUniv Estadual Paulista, Inst Nacl Ciencia & Tecnol Fisiol Comparada, Dept Zool, BR-13506900 Rio Claro, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Nacl Ciencia & Tecnol Fisiol Comparada, Dept Zool, BR-13506900 Rio Claro, SP, Brazil
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipFundação para o Desenvolvimento da UNESP (FUNDUNESP)
dc.description.sponsorshipNatural Sciences and Engineering Research Council of Canada
dc.format.extent905-915
dc.identifierhttp://dx.doi.org/10.1007/s00360-015-0928-2
dc.identifier.citationJournal Of Comparative Physiology B-biochemical Systemic And Environmental Physiology. Heidelberg: Springer Heidelberg, v. 185, n. 8, p. 905-915, 2015.
dc.identifier.doi10.1007/s00360-015-0928-2
dc.identifier.fileWOS000363952300008.pdf
dc.identifier.issn0174-1578
dc.identifier.urihttp://hdl.handle.net/11449/160935
dc.identifier.wosWOS:000363952300008
dc.language.isoeng
dc.publisherSpringer
dc.relation.ispartofJournal Of Comparative Physiology B-biochemical Systemic And Environmental Physiology
dc.relation.ispartofsjr0,952
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectReptiles
dc.subjectTegu lizards
dc.subjectTorpor
dc.subjectDormancy
dc.subjectHibernation
dc.subjectCardiorespiratory control
dc.subjectSeasonal adjustments
dc.titleDaily and annual cycles in thermoregulatory behaviour and cardio-respiratory physiology of black and white tegu lizardsen
dc.typeArtigo
dcterms.licensehttp://www.springer.com/open+access/authors+rights?SGWID=0-176704-12-683201-0
dcterms.rightsHolderSpringer
unesp.author.lattes8776757457144680[5]
unesp.author.orcid0000-0002-6765-8726[5]

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Artigos - Zoologia - IBRC