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Biol Bull 158: 118-128. (February 1980)
© 1980 Marine Biological Laboratory
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OXYGEN UPTAKE AND TRANSPORT IN THE PROSOBRANCH MOLLUSC BUSYCON CANALICULATUM (L.) II. INFLUENCE OF ACCLIMATION SALINITY AND TEMPERATURE

GREGORY POLITES 1 and CHARLOTTE P. MANGUM 1

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

1. The oxygen transport function of the blood in Busycon canaliculatum diminishes when either the ambient temperature or the ambient salinity is lowered.

2. At low temperature the oxygen affinity of the hemocyanin increases sharply, and blood Po2 increases as well. Thus the blood cannot deoxygenate at the tissues.

3. At low salinity oxygen affinity does not change appreciably, but the loss of Ca+2 and Mg+2 from the blood reduces the cooperativity of hemocyanin-oxygen binding, requiring a higher Po2 to achieve a given oxygenation state. Thus the blood does not oxygenate as highly at the gill, and total oxygen uptake decreases.






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Copyright © 1980 by the Marine Biological Laboratory.