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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Ventilation and gas exchange in two turtles: Podocnemis unifilis and Phrynops geoffroanus (Testudines: Pleurodira)

Texto completo
Autor(es):
Cordeiro, Tabata E. F. [1] ; Abe, Augusto S. [2, 3] ; Klein, Wilfried [3, 4]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Fed Bahia, Master Program Anim Div, BR-41170290 Salvador, BA - Brazil
[2] State Univ Sao Paulo, Rio Claro - Brazil
[3] Natl Inst Sci & Technol Comparat Physiol, Sao Paulo - Brazil
[4] Univ Sao Paulo, Sch Philosophy Sci & Literature Ribeirao Preto, Av Bandeirantes 3900, Bairro Monte Alegre, BR-14040901 Ribeirao Preto, SP - Brazil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Respiratory Physiology & Neurobiology; v. 224, n. SI, p. 125-131, APR 2016.
Citações Web of Science: 3
Resumo

Turtles (Testudines) have two major taxa, Pleurodira and Cryptodira. To date, only limited data are available regarding the respiratory physiology of pleurodirans. To begin to address this, we studied ventilation and gas exchange in Podocnemis unifilis and Phrynops geoffroanus. Breathing pattern in both species could be described as episodic with breathing episodes separated by large non-ventilatory periods. We measured duration of inspiration and expiration, breathing frequency, duration of the non-ventilatory period (time between episodes), tidal volume, and oxygen consumption when breathing normoxia, hypoxia and hypercarbia at 25 degrees C. In both species hypercarbia caused a greater increase in ventilation compared to hypoxia, increasing both breathing frequency and tidal volume. Minute ventilation and oxygen consumption in P. geoffroanus were the lowest described so far in testudines, indicating either extra-pulmonary gas exchange or a significantly lower metabolism. Oxidative costs of breathing, estimated using the regression method, was the highest described so far for any reptile. Further studies are necessary to better understand respiratory physiology in Phrynops and Podocnemis species. (C) 2014 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 08/57712-4 - Instituto Nacional de Pesquisas em Fisiologia Comparada
Beneficiário:Augusto Shinya Abe
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 12/18652-1 - O custo metabólico e mecânico da ventilação em tartarugas
Beneficiário:Wilfried Klein
Linha de fomento: Auxílio à Pesquisa - Regular