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Temperature effects on oxygen consumption and breathing pattern in juvenile and adult Chelonoidis carbonarius (Spix, 1824)

dc.contributor.authorOliveira, Paulo Roberto Custodio de
dc.contributor.authorAbe, Augusto S. [UNESP]
dc.contributor.authorKlein, Wilfried
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionInstituto Federal do Paraná
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.date.accessioned2023-07-29T12:31:44Z
dc.date.available2023-07-29T12:31:44Z
dc.date.issued2023-01-01
dc.description.abstractThe effects of temperature on breathing pattern and oxygen consumption are being investigated in juvenile tortoises and compared to adults, in order to understand physiological adjustments of the respiratory system as related to body size, especially regarding the energetic expenditure associated with growth. We analyzed the breathing pattern and oxygen consumption of juvenile and adult red-footed tortoises (Chelonoidis carbonarius, Cryptodira: Testudinidae). The animals (N = 9; body mass ranging from 0.03 Kg to 2.5 Kg) were exposed to normoxic-normocarbic conditions using open respirometry in order to determine the breathing pattern and oxygen consumption in three different temperatures (15, 25, 35 °C). The obtained results showed intermittent breathing pattern in all tested temperatures in juveniles and adults. Tidal volume was not affected by changes in temperature, while breathing frequency increased significantly with increasing temperature, leading to a significant increment in minute ventilation between 15 and 35 °C. Mass specific oxygen consumption increased significantly with temperature and juveniles showed greater values when compared to adults. The alterations in the ventilatory response to temperature changes occurred in order to maintain the oxygen supply with increased metabolic activity. The differences between juveniles and adults in breathing frequency lead to juveniles needing a lower ventilation rate to perform gas exchange while extracting more oxygen. While these differences might be attributed to a greater metabolic expenditure during development, scaling effects on respiratory variables might be the main contributors to the found differences.en
dc.description.affiliationPrograma de Pós-graduação em Biologia Comparada Universidade de São Paulo, SP
dc.description.affiliationInstituto Federal do Paraná Campus Avançado Goioerê, PR
dc.description.affiliationInstituto de Biociências Universidade Estadual Paulista, SP
dc.description.affiliationDepartamento de Biologia Faculdade de Filosofia Ciências e Letras de Ribeirão Preto Universidade de São Paulo, SP
dc.description.affiliationUnespInstituto de Biociências Universidade Estadual Paulista, SP
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdCNPq: 308249/2019–4
dc.identifierhttp://dx.doi.org/10.1016/j.resp.2022.103978
dc.identifier.citationRespiratory Physiology and Neurobiology, v. 307.
dc.identifier.doi10.1016/j.resp.2022.103978
dc.identifier.issn1878-1519
dc.identifier.issn1569-9048
dc.identifier.scopus2-s2.0-85140090314
dc.identifier.urihttp://hdl.handle.net/11449/246103
dc.language.isoeng
dc.relation.ispartofRespiratory Physiology and Neurobiology
dc.sourceScopus
dc.subjectGas exchange
dc.subjectLife stage
dc.subjectTemperature
dc.subjectTestudines
dc.subjectVentilation
dc.titleTemperature effects on oxygen consumption and breathing pattern in juvenile and adult Chelonoidis carbonarius (Spix, 1824)en
dc.typeArtigo
dspace.entity.typePublication
unesp.author.orcid0000-0001-6099-6178 0000-0001-6099-6178[3]

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