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The function of hemocyanin in respiration of the blue crabCallinectes sapidus

✍ Scribed by Mangum, C. P. ;Weiland, A. L.

Publisher
John Wiley and Sons
Year
1975
Tongue
English
Weight
561 KB
Volume
193
Category
Article
ISSN
0022-104X

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✦ Synopsis

Abstract

Blood PO~2~ in the blue crab Callinectes sapidus, a very active species of tropical origin, is lower at 22Β°C than that of larger crabs in colder waters. These low oxygen levels permit its hemocyanin to be highly oxygenated at the gill, and to deliver almost half of its oxygen to the tissues in resting animals. Sustained muscular activity results in conspicuous decreases in blood PO~2~, pH and hemocyanin oxygenation. Although the venous reserve is fully utilized, hemocyanin oxygenation at the gill decreases so much that there is no change in its total quantitative function. The large Bohr shift becomes functional during activity, but its quantitative importance is not clear.

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