The respiratory mechanics of the yacare caiman (Caiman yacare)

dc.contributor.authorReichert, Michelle N.
dc.contributor.authorOliveira, Paulo R. C. de
dc.contributor.authorSouza, George M. P. R.
dc.contributor.authorMoranza, Henriette G. [UNESP]
dc.contributor.authorRestan, Wilmer A. Z. [UNESP]
dc.contributor.authorAbe, Augusto S. [UNESP]
dc.contributor.authorKlein, Wilfried
dc.contributor.authorMilsom, William K.
dc.contributor.institutionUniv London
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionInst Fed Parana
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniv British Columbia
dc.description.abstractThe structure and function of crocodilian lungs are unique compared with those of other reptiles. We examined the extent to which this and the semi-aquatic lifestyle of crocodilians affect their respiratory mechanics. We measured changes in intratracheal pressure in adult and juvenile caiman (Caiman yacare) during static and dynamic lung volume changes. The respiratory mechanics of juvenile caiman were additionally measured while the animals were floating in water and submerged at 30, 60 and 90 deg to the water's surface. The static compliance of the juvenile pulmonary system (2.89 +/- 0.22 ml cmH(2)O(-1) 100 g(-1)) was greater than that of adults (1.2 +/- 0.41 ml cmH(2)O(-1) 100 g(-1)), suggesting that the system stiffens as the body wall becomes more muscular and keratinized in adults. For both age groups, the lungs were much more compliant than the body wall, offering little resistance to air flow (15.35 and 4.25 ml cmH(2)O(-1) 100 g(-1) for lungs, versus 3.39 and 1.67 ml cmH(2)O(-1) 100 g(-1) for body wall, in juveniles and adults, respectively). Whole-system dynamic mechanics decreased with increasing ventilation frequency (f(R)), but was unaffected by changes in tidal volume (V-T). The vast majority of the work of breathing was required to overcome elastic forces; however, work to overcome resistive forces increased proportionally with f(R). Work of breathing was higher in juvenile caiman submerged in water at 90 deg because of an increase in work to overcome both elastic and flow resistive forces. The lowest power of breathing was found to occur at high f(R) and low V-T for any given minute ventilation ((V) over dot(E)) in caiman of all ages.en
dc.description.affiliationUniv London, Royal Vet Coll, London NW1 0TU, England
dc.description.affiliationUniv Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, BR-14049900 Ribeirao Preto, SP, Brazil
dc.description.affiliationInst Fed Parana, Ca^mpus Avancado Goioere, BR-87360000 Goioere, PR, Brazil
dc.description.affiliationUniv Sao Paulo, Sch Med Ribeirao Preto, BR-14049900 Ribeirao Preto, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Clin Med Vet, BR-14884900 Jaboticabal, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Dept Zool, BR-13506692 Rio Claro, SP, Brazil
dc.description.affiliationUniv British Columbia, Dept Zool, Vancouver, BC V6T 1Z4, Canada
dc.description.affiliationUnespUniv Estadual Paulista, Clin Med Vet, BR-14884900 Jaboticabal, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Zool, BR-13506692 Rio Claro, SP, Brazil
dc.description.sponsorshipNatural Sciences and Engineering Research Council of Canada (NSERC)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipUniversidade Estadual Paulista (UNESP) from Brazil
dc.description.sponsorshipIdFAPESP: 2008/57712-4
dc.description.sponsorshipIdCNPq: 573921/2008-3
dc.identifier.citationJournal Of Experimental Biology. Cambridge: Company Biologists Ltd, v. 222, n. 2, 11 p., 2019.
dc.publisherCompany Biologists Ltd
dc.relation.ispartofJournal Of Experimental Biology
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectStatic compliance
dc.subjectDynamic compliance
dc.subjectElastic forces
dc.subjectResistive forces
dc.subjectWork of breathing
dc.titleThe respiratory mechanics of the yacare caiman (Caiman yacare)en
dcterms.rightsHolderCompany Biologists Ltd[6][7][6]