Abstract
1. 1. Ocypode saratan has reduced gills and a branchiostegal wall specialized to function as a lung. 2. 2. When submerged, or in humid air, ventilation was by means of the scaphognathites. Crabs inactive in dry air replaced scaphognathite beating by slow pressure variations in the branchial chambers. Increased levels of CO 2 in air caused elevated rates of scaphognathite beating. 3. 3. Heart rate varied with changes in ventilation. 4. 4. The gills were perfused both in submerged and in air breathing crabs, whilst the lungs were preferentially perfused in air, but not perfused in submerged crabs. 5. 5. The respiratory quotient in air was about 0.55.
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More From: Comparative Biochemistry and Physiology -- Part A: Physiology
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