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Journal of Experimental Biology 82,357-365 (1979)
Published by Company of Biologists 1979

Acid-Base Relationships in the Blood of the Toad, Bufo Marinus: III. The Effects of Burrowing

R. G. BOUTILIER ¹, D. J. RANDALL ², G. SHELTON ¹, and D. P. TOEWS ³

¹ Department of Biology, Acadia University, Wolfville, Nova Scotia, Canada BOP 1XO; School of Biological Sciences, University of East Anglia, Norwich, NR4 7TJ, England
² Department of Biology, Acadia University, Wolfville, Nova Scotia, Canada BOP 1XO; Department of Zoology, University of British Columbia, Vancouver, B.C., Canada V6T 1W5
³ Department of Biology, Acadia University, Wolfville, Nova Scotia, Canada BOP 1XO

When Bufo marinus burrows, the skin becomes intimately surrounded by substrate but the nares always remain exposed to the surface air. Upon entering into a state of dormancy the animal hypoventilates and this together with the loss of the skin as a respiratory site results in a rise in arterial blood P_coco2 despite a probable decline in metabolism. Even though lung ventilation falls, the toad regulates blood pH and the respiratory acidosis is progressively compensated for by a progressive increase in plasma [HCO₃-] along the course of an elevated P_COCO2 isopleth. At steady state, the acidosis is fully compensated for by a new equilibrium ratio of HCO₃- to P_COCO2 at the same pH as the non-burrowed animal. Arousal from the dormant state at this time results in a marked lung hyperventilation and a sharp decline in body CO₂ stores

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