Effect of water depth and water velocity upon the surfacing frequency of the bimodally respiring freshwater turtle, Rheodytes leukops

Gordos, M. A., Franklin, C. E. and Limpus, C. (2004) Effect of water depth and water velocity upon the surfacing frequency of the bimodally respiring freshwater turtle, Rheodytes leukops. The Journal of Experimental Biology, 207 17: 3099-3107. doi:10.1242/jeb.01108

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Author Gordos, M. A.
Franklin, C. E.
Limpus, C.
Title Effect of water depth and water velocity upon the surfacing frequency of the bimodally respiring freshwater turtle, Rheodytes leukops
Journal name The Journal of Experimental Biology   Check publisher's open access policy
ISSN 0022-0949
0022-3107
Publication date 2004
Sub-type Article (original research)
DOI 10.1242/jeb.01108
Open Access Status File (Publisher version)
Volume 207
Issue 17
Start page 3099
End page 3107
Total pages 9
Editor H. Hoppeler
Place of publication Cambridge
Publisher The Company of Biologists Ltd
Collection year 2004
Language eng
Subject C1
270603 Animal Physiology - Systems
780105 Biological sciences
06 Biological Sciences
Abstract This study examines the effect of increasing water depth and water velocity upon the surfacing behaviour of the bimodally respiring turtle, Rheodytes leukops. Surfacing frequency was recorded for R. leukops at varying water depths (50, 100, 150 cm) and water velocities (5, 15, 30 cm s(-1)) during independent trials to provide an indirect cost-benefit analysis of aquatic versus pulmonary respiration. With increasing water velocity, R. leukops decreased its surfacing frequency twentyfold, thus suggesting a heightened reliance upon aquatic gas exchange. An elevated reliance upon aquatic respiration, which presumably translates into a decreased air-breathing frequency, may be metabolically more efficient for R. leukops compared to the expenditure (i.e. time and energy) associated with air-breathing within fast-flowing riffle zones. Additionally, R. leukops at higher water velocities preferentially selected low-velocity microhabitats, presumably to avoid the metabolic expenditure associated with high water flow. Alternatively, increasing water depth had no effect upon the surfacing frequency of R. leukops, suggesting little to no change in the respiratory partitioning of the species across treatment settings. Routinely long dives (>90 min) recorded for R. leukops indicate a high reliance upon aquatic O-2 uptake regardless of water depth. Moreover, metabolic and temporal costs attributed to pulmonary gas exchange within a pool-like environment were likely minimal for R. leukops, irrespective of water depth.
Keyword Biology
Turtle
Rheodytes Leukops
Diving
Bimodal Respiration
Aquatic Respiration
Corydoras-aeneus Callichthyidae
American Stream Fishes
Chrysemys-picta-bellii
Air-breathing Catfish
Aquatic Oxygen-uptake
Diving Behavior
Respiratory Behavior
Aerial Respiration
Gas-exchange
Acid-base
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 03:36:20 EST