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First published online December 10, 2003
Journal of Experimental Biology 207, 269-283 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.00744

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-Adrenergic regulation of systemic peripheral resistance and blood flow distribution in the turtle Trachemys scripta during anoxic submergence at 5°C and 21°C

J. A. W. Stecyk^1,*, J. Overgaard², A. P. Farrell¹ and T. Wang²

¹ Department of Biological Sciences, Simon Fraser University, Burnaby, BC, Canada, V5A 1S6
² Department of Zoophysiology, Aarhus University, Building 131, 8000 Aarhus C, Denmark

View larger version (14K): [in a new window]   Fig. 1. Regression plot of percent of total systemic cardiac output (%sys) directed to tissues perfused by the left subclavian and carotid arteries, as measured with ultrasonic flow probes (x axis) and the microsphere recovery technique (y axis). Values presented are from 5°C and 21°C acclimated turtles (N=7) during normoxic control, routine anoxia and following -adrenergic stimulation and blockade during anoxia.

View larger version (23K): [in a new window]   Fig. 2. Chronological changes of cardiovascular function in 21°C-acclimated turtles during 6 h of anoxic submergence. Asterisks indicate significant differences (P<0.05) of each final anoxic measurement from normoxic control (time zero). Values are means ± S.E.M.; N=8 unless otherwise indicated above the error bar.

View larger version (20K): [in a new window]   Fig. 3. Chronological changes of cardiovascular function in 5°C-acclimated turtles during 12 days of anoxic submergence. Asterisks indicate significant differences (P<0.05) of each final anoxic measurement from normoxic control (time zero). Values are means ± S.E.M.; N=6.

View larger version (41K): [in a new window]   Fig. 4. Percent of systemic cardiac output (%sys) distributed between tissues from turtles acclimated at 5°C (A,B) and 21°C (C,D). (A) Routine normoxic control at 5°C, (B) after 12 days of anoxic submergence at 5°C, (C) routine normoxic control at 21°C and (D) after 6 h of anoxic submergence at 21°C. Asterisks indicate significant (P<0.05) tissue specific differences in %sys between acclimation temperatures in routine normoxic control. Exploded slices signify significant differences (P<0.05) in tissue %sys between routine normoxia and anoxia within each acclimation temperature. N=6 at 5°C and 5 at 21°C.

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