| response of heart rate and cloacal ventilation in the bimodally respiring freshwater turtle, rheodytes leukops, to experimental changes in aquatic po2. | changes in heart rate (f(h)) and cloacal ventilation frequency (f(c)) were investigated in the fitzroy turtle, rheodytes leukops, under normoxic (17.85 kpa) and hypoxic (3.79 kpa) conditions at 25 degrees c. given r. leukops' high reliance on aquatic respiration via the cloacal bursae, the objective of this study was to examine the effect of varying aquatic po(2) levels upon the expression of a bradycardia in a freely diving, bimodally respiring turtle. in normoxia, mean diving f(h) and f(c) for ... | 2006 | 16235043 |
| seasonal and diel dive performance and behavioral ecology of the bimodally respiring freshwater turtle myuchelys bellii of eastern australia. | freshwater turtles have an extraordinary physiological ability to endure dive times that can range from days to months using aquatic respiration. in cryptodires (e.g., white-lipped mud turtle kinosternon leucostomum) aquatic respiration is via buccal or cutaneous routes whereas in pleurodires (e.g., fitzroy river turtle rheodytes leukops), it is achieved primarily via specialized cloacal bursae. this study records the voluntary diving performance of the western sawshelled turtle myuchelys bellii ... | 2012 | 22045114 |
| effect of water depth and water velocity upon the surfacing frequency of the bimodally respiring freshwater turtle, rheodytes leukops. | 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 sug ... | 2004 | 15277564 |
| blood-respiratory and acid-base changes during extended diving in the bimodally respiring freshwater turtle rheodytes leukops. | 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 po(2), pco(2), and ph, as well as plasma concentrations of lactate, glucose, na(+), k(+), cl(-) ... | 2004 | 15034732 |