Abstract
1. 1. Mudflat dwelling bivalves undergo intermittent periods of anoxia and elevated sulfide during tidal exposure. 2. 2. The sulfide uptake, tolerance and changes in anaerobic metabolite concentrations during sulfide exposure were investigated in two congeneric clam species Macoma secta and M. nasuta. 3. 3. Both species showed a lower tolerance to anoxia in the presence of sulfide. 4. 4. Both species had the ability to maintain an internal sulfide concentration below that of the environment. 5. 5. Anaerobiosis in the presence of sulfide did not affect the utilization of glucose, glycogen, and aspartate energy reserves in M. secta while M. nasuta showed a significantly higher overall glycogen reserve, and a lower utilization of glucose and aspartate. 6. 6. Octopine levels in both clams were elevated following anoxic incubation in the presence of sulfide. 7. 7. The results suggest that M. nasuta's higher sulfide tolerance may be due to regulation of basal metabolic rate during anoxic sulfide exposure.
Published Version
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