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The Biological Bulletin, Vol 183, Issue 2 297-303, Copyright © 1992 by Marine Biological Laboratory

PHYSIOLOGY

Ion Transport in the Freshwater Zebra Mussel, Dreissena polymorpha

J. Horohov, H. Silverman, J. W. Lynn and T. H. Dietz
Department of Zoology and Physiology, Louisiana State University, Baton Rouge, Louisiana, 70803

The blood solute concentration (36 mosm) of pondwater acclimated zebra mussels is among the lowest found in freshwater bivalves. Blood ion concentrations were Na (11-14 mM) and Cl (12-15 mM), with lesser amounts of Ca (4-5 mM), HCO3 (about 2-4 mM), and K (0.5 mM). Sodium, Ca and Cl transport rates were 20-30 {mu}eq (g dry tissue {middot} h)-1 for pondwater acclimated mussels. The influx of both Na and Cl was stimulated by exogenous serotonin (0.1 mM). Sodium transport in zebra mussels was not inhibited by amiloride. Zebra mussels became isosmotic in 30 mM NaCl solutions and did not survive beyond a week in 45 mM NaCl. Zebra mussels are well adapted to their dilute freshwater habitat, but are more stenohaline than other freshwater bivalves as reflected by their intolerance of elevated ion concentrations in the bathing solution.




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Copyright © 1992 by the Marine Biological Laboratory.