Blood Oxygen and Ecology of Porpoises of Three Genera

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Abstract
Blood volumes, hemoglobin concentrations, packed-cell volumes, and heart weights were determined in three genera of porpoises which differ from one another in behavior and ecology. The estimate for the total blood-oxygen content of the highly active, deep-diving, pelagic species Phocoenoides dalli was almost three times greater than that for the coastal-dwelling species Tursiops truncatus , and about 70 percent greater than for the less active pelagic species, Lagenorhynchus obliquidens . Heart weights of Phocoenoides dalli were about 140 percent greater than in Tursiops truncatus and 55 percent greater than in Lagenorhynchus obliquidens .

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