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First published online June 15, 2006
Journal of Experimental Biology 209, 2576-2585 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02273
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The effect of myoglobin concentration on aerobic dive limit in a Weddell seal

T. J. Wright* and R. W. Davis

Department of Marine Biology, Texas A&M University at Galveston, Galveston, TX 77551, USA and Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX 77843, USA


Figure 1
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  		Fig. 1. Simplified circulatory system used in the model. The cardiovascular system was divided into four regional circulations: coronary, cerebral, skeletal muscle and a combined category that included the splanchnic, renal, cutaneous and other circulatory beds.

 

Figure 2
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  		Fig. 2. Calculated postabsorptive aerobic dive limit (ADL) for four myoglobin concentrations (mg g–1 muscle) as a function of skeletal muscle oxygen consumption (VMO2). Vertical dotted line marks the estimated routine level of diving VMO2 for a Weddell seal.

 

Figure 3
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  		Fig. 3. Optimal cardiac output as a function of skeletal muscle metabolism (VMO2) for four myoglobin concentrations (mg g–1 muscle). Vertical dotted line marks the estimated routine level of diving VMO2 for a Weddell seal.

 

Figure 4
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  		Fig. 4. Myoglobin oxygen used during diving at a muscular exertion of 5-times resting VMO2 for four Mb concentrations.

 

Figure 5
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  		Fig. 5. Aerobic dive limit (ADL) as a function of muscle oxygen consumption (VMO2) for a postprandial Weddell seal with normal and elevated Mb concentrations. Vertical dotted line marks the estimated routine level of diving VMO2 for a Weddell seal.

 




© The Company of Biologists Ltd 2006