Metabolic responses of the burrowing mud shrimp, Callianassa californiensis, to anoxic conditions Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/z316q4839

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  • Callianassa californiensis (Dana), a burrowing crustacean inhabitant of estuarine mudflats along the Pacific coast, is subjected to severely hypoxic interstitial water twice each tidal cycle. A preliminary approach was made to understanding the metabolic mechanisms employed by Callianassa during periods of anoxic stress. Percent glycogen in the hepatopancreas and chela muscle, blood lactic acid, and blood glucose were determined for animals subjected to periods of anoxia. Blood lactate and glucose analyses were performed on animals at various intervals during a post-anoxia recovery period. Callianassa was found to accumulate the anaerobic end product, lactic acid, at a steady rate during anoxia. The blood glucose concentration was shown to increase with initiation of anoxia until about 12 to 14 hours when it tended to reach an equilibrium. Glycogen utilization did not appear to be important during short periods of anoxic stress, but for periods longer than 12 to 14 hours, glycogenolysis became important in maintaining glucose substrate for glycolysis. During the post-anoxia recovery period, the accumulated blood lactate was oxidized and blood glucose was reduced to the normal concentration. The possibility of the existence and role of free blood oligosaccharides as a source of glucose during anoxia was discussed.
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