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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/31726
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dc.contributor.authorFlorindo, L. H.-
dc.contributor.authorLeite, CAC-
dc.contributor.authorKalinin, A. L.-
dc.contributor.authorReid, S. G.-
dc.contributor.authorMilsom, W. K.-
dc.contributor.authorRantin, F. T.-
dc.date.accessioned2014-05-20T15:20:25Z-
dc.date.accessioned2016-10-25T17:53:32Z-
dc.date.available2014-05-20T15:20:25Z-
dc.date.available2016-10-25T17:53:32Z-
dc.date.issued2006-05-01-
dc.identifierhttp://dx.doi.org/10.1242/jeb.02199-
dc.identifier.citationJournal of Experimental Biology. Cambridge: Company of Biologists Ltd, v. 209, n. 9, p. 1709-1715, 2006.-
dc.identifier.issn0022-0949-
dc.identifier.urihttp://hdl.handle.net/11449/31726-
dc.identifier.urihttp://acervodigital.unesp.br/handle/11449/31726-
dc.description.abstractThe present study examined the role of branchial and orobranchial O-2 chemoreceptors in the cardiorespiratory responses, aquatic surface respiration (ASR), and the development of inferior lip swelling in tambaqui during prolonged (6 h) exposure to hypoxia. Intact fish (control) and three groups of denervated fish (bilateral denervation of cranial nerves IX+X (to the gills), of cranial nerves V+VII (to the orobranchial cavity) or of cranial nerves V alone), were exposed to severe hypoxia (Pw(O2) = 10 mmHg) for 360 min. Respiratory frequency (fR) and heart rate (fH) were recorded simultaneously with ASR. Intact (control) fish increased fR, ventilation amplitude (V-AMP) and developed hypoxic bradycardia in the first 60 min of hypoxia. The bradycardia, however, abated progressively and had returned to normoxic levels by the last hour of exposure to hypoxia. The changes in respiratory frequency and the hypoxic bradycardia were eliminated by denervation of cranial nerves IX and X but were not affected by denervation of cranial nerves V or V+VII. The VAMP was not abolished by the various denervation protocols. The fH in fish with denervation of cranial nerves V or V+VII, however, did not recover to control values as in intact fish. After 360 min of exposure to hypoxia only the intact and IX+X denervated fish performed ASR. Denervation of cranial nerve V abolished the ASR behavior. However, all (control and denervated (IX+X, V and V+VII) fish developed inferior lip swelling. These results indicate that ASR is triggered by O-2 chemoreceptors innervated by cranial nerve V but that other mechanisms, such as a direct effect of hypoxia on the lip tissue, trigger lip swelling.en
dc.format.extent1709-1715-
dc.language.isoeng-
dc.publisherCompany of Biologists Ltd-
dc.sourceWeb of Science-
dc.subjectcardiorespiratory reflexpt
dc.subjecthypoxiapt
dc.subjectO-2 chemoresponsept
dc.subjectrespiratory frequencypt
dc.subjectheart frequencypt
dc.subjectASRpt
dc.subjectinferior lip swellingpt
dc.subjectColossoma macropomumpt
dc.titleThe role of branchial and orobranchial O-2 chemoreceptors in the control of aquatic surface respiration in the neotropical fish tambaqui (Colossoma macropomum): progressive responses to prolonged hypoxiaen
dc.typeoutro-
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionUniv Toronto-
dc.contributor.institutionUniv British Columbia-
dc.description.affiliationUniv Fed Sao Carlos, Dept Physiol Sci, BR-13565905 Sao Carlos, SP, Brazil-
dc.description.affiliationSão Paulo State Univ UNESP, Dept Zool & Bot, Sao Jose do Rio Preto, SP, Brazil-
dc.description.affiliationUniv Toronto, Div Life Sci, Scarborough, ON M1C 1A4, Canada-
dc.description.affiliationUniv British Columbia, Dept Zool, Vancouver, BC V5Z 1M9, Canada-
dc.description.affiliationUnespSão Paulo State Univ UNESP, Dept Zool & Bot, Sao Jose do Rio Preto, SP, Brazil-
dc.identifier.doi10.1242/jeb.02199-
dc.identifier.wosWOS:000237220300023-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofJournal of Experimental Biology-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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