Cardiorespiratory responses to hypoxia in the African catfish, Clarias gariepinus (Burchell 1822), an air-breathing fish

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dc.contributor.authorBelao, T. C.
dc.contributor.authorLeite, C. A. C. [UNESP]
dc.contributor.authorFlorindo, L. H. [UNESP]
dc.contributor.authorKalinin, A. L.
dc.contributor.authorRantin, F. T.
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:59:55Z
dc.date.available2014-05-20T13:59:55Z
dc.date.issued2011-10-01
dc.description.abstractThe African catfish, Clarias gariepinus, possesses a pair of suprabranchial chambers located in the dorsal-posterior part of the branchial cavity having extensions from the upper parts of the second and fourth gill arches, forming the arborescent organs. This structure is an air-breathing organ (ABO) and allows aerial breathing (AB). We evaluated its cardiorespiratory responses to aquatic hypoxia. To determine the mode of air-breathing (obligate or accessory), fish had the respiratory frequency (f(R)) monitored and were subjected to normoxic water (PwO(2) = 140 mmHg) without becoming hyperactive for 30 h. During this period, all fish survived without displaying evidences of hyperactivity and maintained unchanged f(R), confirming that this species is a facultative air-breather. Its aquatic O(2) uptake ((V) over dot O(2)) was maintained constant down to a critical PO(2) (PcO(2)) of 60 mmHg, below which (V) over dot O(2) declined linearly with further reductions of inspired O(2) tension (PiO(2)). Just above the PcO(2) the ventilatory tidal volume (V(T)) increased significantly along with gill ventilation ((V) over dot G), while fR changed little. Consequently, the water convection requirement (V) over dot G/(V) over dot O(2)) increased steeply. This threshold applied to a cardiac response that included reflex bradycardia. AB was initiated at PiO(2) = 140 mmHg (normoxia) and air-breathing episodes increased linearly with more severe hypoxia, being significantly higher at PiO(2) tensions below the PcO(2). Air-breathing episodes were accompanied by bradycardia pre air-breath, to tachycardia post air-breath.en
dc.description.affiliationFed Univ São Carlos UFSCar, Dept Physiol Sci, BR-13565905 São Paulo, Brazil
dc.description.affiliationSão Paulo State Univ UNESP, Dept Zool, Rio Claro, SP, Brazil
dc.description.affiliationSão Paulo State Univ UNESP, Dept Bot & Zool, Sao Jose do Rio Preto, SP, Brazil
dc.description.affiliationComparat Physiol FAPESP CNPq, Natl Inst Sci & Technol, São Paulo, Brazil
dc.description.affiliationUnespSão Paulo State Univ UNESP, Dept Zool, Rio Claro, SP, Brazil
dc.description.affiliationUnespSão Paulo State Univ UNESP, Dept Bot & Zool, Sao Jose do Rio Preto, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent905-916
dc.identifierhttp://dx.doi.org/10.1007/s00360-011-0577-z
dc.identifier.citationJournal of Comparative Physiology B-biochemical Systemic and Environmental Physiology. Heidelberg: Springer Heidelberg, v. 181, n. 7, p. 905-916, 2011.
dc.identifier.doi10.1007/s00360-011-0577-z
dc.identifier.issn0174-1578
dc.identifier.lattes2797832406818407
dc.identifier.urihttp://hdl.handle.net/11449/21189
dc.identifier.wosWOS:000297250800006
dc.language.isoeng
dc.publisherSpringer Heidelberg
dc.relation.ispartofJournal of Comparative Physiology B: Biochemical Systemic and Environmental Physiology
dc.relation.ispartofjcr2.517
dc.relation.ispartofsjr0,952
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectHypoxiaen
dc.subjectOxygen uptakeen
dc.subjectGill ventilationen
dc.subjectCritical oxygen tensionen
dc.subjectHeart rateen
dc.subjectAir-breathingen
dc.titleCardiorespiratory responses to hypoxia in the African catfish, Clarias gariepinus (Burchell 1822), an air-breathing fishen
dc.typeArtigo
dcterms.licensehttp://www.springer.com/open+access/authors+rights?SGWID=0-176704-12-683201-0
dcterms.rightsHolderSpringer Heidelberg
unesp.author.lattes2797832406818407
unesp.author.orcid0000-0002-5648-5903[2]
unesp.author.orcid0000-0002-5957-6472[4]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Rio Claropt
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências Letras e Ciências Exatas, São José do Rio Pretopt

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Artigos - Zoologia - IBRC
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