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Effects of temperature and hypercapnia on ventilation and breathing pattern in the lizard Uromastyx aegyptius microlepis

dc.contributor.authorKlein, W.
dc.contributor.authorAndrade, D. V. [UNESP]
dc.contributor.authorWang, T.
dc.contributor.authorTaylor, E. W.
dc.contributor.institutionAarhus University (AU)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversität Bonn
dc.contributor.institutionUniversity of Birmingham
dc.date.accessioned2014-02-26T17:14:08Z
dc.date.accessioned2014-05-20T13:58:59Z
dc.date.available2014-02-26T17:14:08Z
dc.date.available2014-05-20T13:58:59Z
dc.date.issued2002-08-01
dc.description.abstractIn most reptiles, the ventilatory response to hypercapnia consists of large increases in tidal volume (V-T), whereas the effects on breathing frequency (f(R)) are more variable. The increased V-T seems to arise from direct inhibition of pulmonary stretch receptors. Most reptiles also exhibit a transitory increase in ventilation upon removal of CO2 and this post-hypercapnic hyperpnea may consist of changes in both V-T and f(R). While it is well established that increased body temperature augments the ventilatory response to hypercapnia, the effects of temperature on the post-hypercapnic hyperpnea is less described. In the present study, we characterise the ventilatory response of the agamid lizard Uromastyx aegyptius to hypercapnia and upon the return to air at 25 and 35 degreesC. At both temperatures, hypercapnia caused large increases in V-T and small reductions in f(R), that were most pronounced at the higher temperature. The post-hypercapnic hyperpnea, which mainly consisted of increased fR, was numerically larger at 35 compared to 25 degreesC. However, when expressed as a proportion of the levels of ventilation reached during steady-state hypercapnia, the post-hypercapnic hyperpnea was largest at 25 degreesC. Some individuals exhibited buccal pumping where each expiratory thoracic breath was followed by numerous small forced inhalations caused by contractions of the buccal cavity. This breathing pattern was most pronounced during severe hypercapnia and particularly evident during the post-hypercapnic hyperpnea. (C) 2002 Published by Elsevier B.V.en
dc.description.affiliationAarhus Univ, Zoofysiol Afdeling, DK-8000 Aarhus C, Denmark
dc.description.affiliationUNESP, Dept Zool, Rio Claro, Brazil
dc.description.affiliationUniv Bonn, Dept Zool, D-5300 Bonn, Germany
dc.description.affiliationUniv Birmingham, Sch Biosci, Birmingham B15 2TT, W Midlands, England
dc.description.affiliationUnespUNESP, Dept Zool, Rio Claro, Brazil
dc.format.extent847-859
dc.identifierhttp://dx.doi.org/10.1016/S1095-6433(02)00052-1
dc.identifier.citationComparative Biochemistry and Physiology A-molecular and Integrative Physiology. New York: Elsevier B.V., v. 132, n. 4, p. 847-859, 2002.
dc.identifier.doi10.1016/S1095-6433(02)00052-1
dc.identifier.issn1095-6433
dc.identifier.urihttp://hdl.handle.net/11449/20946
dc.identifier.wosWOS:000177235600014
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofComparative Biochemistry and Physiology A-molecular & Integrative Physiology
dc.relation.ispartofjcr2.258
dc.relation.ispartofsjr0,836
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjecthypercapniapt
dc.subjectpost-hypercapnic hyperpneapt
dc.subjectbreathing patternpt
dc.subjecttemperaturept
dc.subjectbuccal pumpingpt
dc.subjectreptilept
dc.subjectUromastyxpt
dc.subjectventilatory controlpt
dc.titleEffects of temperature and hypercapnia on ventilation and breathing pattern in the lizard Uromastyx aegyptius microlepisen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
dspace.entity.typePublication
unesp.author.orcid0000-0002-7662-2848[2]
unesp.author.orcid0000-0002-4350-3682[3]
unesp.author.orcid0000-0001-6099-6178[1]
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Biociências, Rio Claropt
unesp.departmentZoologia - IBpt

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