Abstract
The effects of salinity and temperature on the oxygen-transporting properties of the hemolymph of Macrobrachium rosenbergii have been examined. Values for Po2 of the pre-and postbranchial hemolymph (Pao2 and Pvo2) were quite low (12.7 and 8.4 Torr, respectively) in quiescent prawns maintained in freshwater. Values for Pao2 increased significantly, however, in prawns maintained at salinities of 17.5‰ and 28‰. Small but significant differences were recorded in the oxygen afinity (P50) of hemocyanin from prawns acclimated to salinities of 0‰, 17‰, and 28‰. Salinity had no significant effect, however, on the size of the Bohr effect. In addition, temperature had a pronounced effect on the P50 of hemocyanin but did not affect the Bohr value; an increase in temperature from 22° to 32°C resulted in an increase in the P50 of the hemocyanin of prawns maintained in freshwater from 6.7 to 22.5 Torr (at pH 7 70). Cooperativity was found to be unaffected by either temperature or salinity. Altering the Ca concentration of the hemolymph in vitro had a pronounced effect, however, on P50; a reduction in [Ca] resulted in an increase in P50.
Published Version
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