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Biol Bull 158: 77-90. (February 1980)
© 1980 Marine Biological Laboratory
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OXYGEN UPTAKE AND TRANSPORT IN THE PROSOBRANCH MOLLUSC BUSYCON CANALICULATUM. I. GAS EXCHANGE AND THE RESPONSE TO HYPOXIA

CHARLOTTE P. MANGUM 1 and GREGORY POLITES 1

1 Department of Biology, College of William and Mary, Williamsburg, Virginia 23185

1. The blood of the conch Busycon canaliculatum is highly oxygenated at the two sites of gas exchange with the ambient medium, the gill and the mantle. An exceptionally small venous reserve is maintained in prebranchial blood, suggesting an important respiratory role of the oxygen transport system.

2. In normoxic water the physiological pH range is 7.85 to 8.04, where the reverse Bohr shift of Busycon hemocyanin is essentially absent. During non-lethal exposure to hypoxia, blood pH does not decrease substantially and thus the reverse Bohr shift cannot be interpreted as an adaptation to low oxygen conditions.






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Copyright © 1980 by the Marine Biological Laboratory.