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First published online October 21, 2004
Journal of Experimental Biology 207, 4157-4164 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.01251

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Cardiorespiratory and tissue adenosine responses to hypoxia and reoxygenation in the short-horned sculpin Myoxocephalus scorpius

T. J. MacCormack and W. R. Driedzic^*

Ocean Sciences Centre, Memorial University of Newfoundland, St John's, NL, Canada A1C 5S7

View larger version (7K): [in a new window]   Fig. 1. Sampling protocol for biochemical and plasma ion determinations in short-horned sculpin Myoxocephalus scorpius exposed to hypoxia and reoxygenation. DO2, dissolved oxygen saturation. Asterisks indicate the time at which each group of fish was sampled (N=8 for each group).

View larger version (20K): [in a new window]   Fig. 2. Cardiovascular characteristics (A) and ventilation rate (B) of short-horned sculpin Myoxocephalus scorpius exposed to graded hypoxia and reoxygenation (8°C). (C) DO2 was reduced to 5.6 and 3.8 mg l-1 for 0.5 h each, followed by 6 h at 2.0 mg l-1 and 1 h reoxygenation. *Significant difference (P<0.05) from normoxia. FH, heart rate; , cardiac output; VS, stroke volume; FV, ventilation rate.

View larger version (29K): [in a new window]   Fig. 3. Cardiac and brain adenosine levels (A) and plasma lactate (B), K+ (C), Ca2+ (D) and Na+ (E) levels from short-horned sculpin Myoxocephalus scorpius exposed to graded hypoxia (8°C). *Significant difference (P<0.05) from levels under normoxia; a indicates a significant difference from adjacent values (see text for details).

View larger version (21K): [in a new window]   Fig. 4. Cardiac and brain adenosine levels (A) and plasma lactate, K+, Ca2+ and Na+ (B) levels from Myoxocephalus scorpius exposed to normoxia and acute hypoxia (8°C). *Significant difference (P<0.05) from levels under normoxia.

View larger version (26K): [in a new window]   Fig. 5. Cardiac and brain adenosine levels (A) and plasma lactate, K+, Ca2+ and Na+ (B) levels from Myoxocephalus scorpius exposed to 2.0 mg l-1 DO2 for 6 h followed by 1 h of reoxygenation (reox) (8°C). *Significant difference (P<0.05) from levels observed at 6 h at 2.0 mg l-1 DO2.