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The effect of salinity on cadmium uptake by brine shnmp Artemia franciscana was studied in chem~cally defined saltwater solut~ons. Shrimp were acclimated to di.fferent s a l i n~t~e s and exposed to the metal in solutions of differing salinity and composit~on Within each acclimation group, the cadmium uptake decreased with Increasing salinity of exposure. Most of this variation was explained by changes in the activity of the free metal ion. Among the acclimation groups, uptake increased with increasing salinity of acclimation. Most of this variation was explained by changes in the permeability of the shrimp. Uptake was not influenced by changes in the osmolarity or the concentration of any of the major cations in the solution. The integration of both chemlcal and biological effects of changes in salinity explains almost all variation in cadmium uptake by brine s h r~m p .

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