Blood-respiratory and acid-base changes during extended diving in the bimodally respiring freshwater turtle Rheodytes leukops

Gordos, M. A., Franklin, C. E., Limpus, C. J. and Wilson, G. (2004) Blood-respiratory and acid-base changes during extended diving in the bimodally respiring freshwater turtle Rheodytes leukops. Journal of Comparative Physiology B-biochemical Systemic And Environmental Physiology, 174 4: 347-354. doi:10.1007/s00360-004-0420-x


Author Gordos, M. A.
Franklin, C. E.
Limpus, C. J.
Wilson, G.
Title Blood-respiratory and acid-base changes during extended diving in the bimodally respiring freshwater turtle Rheodytes leukops
Journal name Journal of Comparative Physiology B-biochemical Systemic And Environmental Physiology   Check publisher's open access policy
ISSN 0174-1578
Publication date 2004-01-01
Year available 2004
Sub-type Article (original research)
DOI 10.1007/s00360-004-0420-x
Open Access Status Not yet assessed
Volume 174
Issue 4
Start page 347
End page 354
Total pages 8
Editor G. Heldmaier
I. D. Hume
L. C. H. Wang
Place of publication New York
Publisher Springer
Language eng
Subject C1
270604 Comparative Physiology
780105 Biological sciences
Abstract Changes in blood-gas, acid-base, and plasma-ion status were investigated in the bimodally respiring turtle, Rheodytes leukops, during prolonged dives of up to 12 h. Given that R. leukops routinely submerges for several hours, the objective of this study was to determine whether voluntarily diving turtles remain aerobic and simultaneously avoid hypercapnic conditions over increasing dive lengths. Blood PO2, PCO2, and pH, as well as plasma concentrations of lactate, glucose, Na+, K+, Cl-, total Ca, and total Mg were determined in venous blood collected from the occipital sinus. Blood PO2 declined significantly with dive length; however, oxy-haemoglobin saturation remained greater than 30% for all R. leukops sampled. No changes were observed in blood PCO2, pH, [HCO3-], or plasma glucose, with increasing dive length. Despite repeated dives lasting more than 2 h, plasma lactate remained less than 3 mmol l(-1) for all R. leukops sampled, indicating the absence of anaerobiosis. Compensatory acid-base adjustments associated with anaerobiosis (e.g. declining [Cl-], increasing total [Ca] and [Mg]) were likewise absent, with plasma-ion concentrations remaining stable with increasing dive length. Results indicate that R. leukops utilises aquatic respiration to remain aerobic during prolonged dives, thus effectively avoiding the development of a metabolic and respiratory acidosis.
Keyword Physiology
Zoology
Rheodytes Leukops
Turtle
Bimodal Respiration
Blood Chemistry
Diving
Chrysemys-picta-bellii
Ridley Sea-turtle
Oxygen-transport
Gas-exchange
Simulated Hibernation
Sternotherus-odoratus
Chelydra-serpentina
Pseudemys-scripta
Comparative Physiology
Lepidochelys-kempi
Q-Index Code C1
Institutional Status UQ

 
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Created: Wed, 15 Aug 2007, 13:06:15 EST