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Hyper-osmoregulatory capacity of the Chinese mitten crab (Eriocheir sinensis) exposed to cadmium; acclimation during chronic exposure
Silvestre, F.; Trausch, G.; Devos, P. (2005). Hyper-osmoregulatory capacity of the Chinese mitten crab (Eriocheir sinensis) exposed to cadmium; acclimation during chronic exposure. Comp. Biochem. Physiol., Toxicol. Pharmacol. 140(1): 29-37. dx.doi.org/10.1016/j.cca.2004.12.007
In: Comparative Biochemistry and Physiology. Part C. Toxicology and Pharmacology. Elsevier: New York, NY. ISSN 1532-0456, more
Peer reviewed article  

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Author keywords
    cadmium; Eriocheir sinensis; osmoregulation; acclimation; hemolymphosmolality; Na+; Cl-; Na+/K+-ATPase; cytochrome c oxidase; chronicstress; gill ultrastructure

Authors  Top 
  • Silvestre, F.
  • Trausch, G.
  • Devos, P.

Abstract
    The aim of this study was to evaluate the effects of waterborne cadmium on hyper-osmoregulatory capacity of the Chinese mitten crab Eriocheir sinensis acclimated to freshwater. For this purpose, crabs were submitted to acute (0.5 mg Cd L−1 for 1, 2 or 3 days), chronic (10 or 50 μg Cd L−1 for 30 days) or chronic, immediately followed by acute, exposure. While no effect was observed after 1 or 2 days, hemolymph osmolality, Na+ and Cl concentrations were significantly reduced after 3 days of acute exposure. Under this latter condition, the respiratory anterior gill ultrastructure, Na+/K+-ATPase and cytochrome c oxidase activities were significantly impaired. In contrast, the osmoregulatory posterior gill was unaffected for all treatments. As a consequence, we suggest that the observed hyper-osmoregulatory capacity impairment is the result of increased dissipative flow of ions and/or water through anterior gills. In contrast to acute exposure, chronic exposure did not induce any observable effect. However, crabs submitted to a known deleterious acute condition (0.5 mg Cd L−1 for 3 days) directly after chronic exposure to 50 μg Cd L−1 for 30 days showed normal hyper-osmoregulatory capacity with no change in gill Na+/K+-ATPase activity, and only little disturbance of anterior gill ultrastructure. These results demonstrate that a chronic cadmium exposure can induce acclimation mechanisms related to osmoregulation in this euryhaline decapod crustacean.

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