Magnesium concentration in the carapace of live specimens of the euryhaline ostracode Cyprideis americana from lakes of varying salinity on San Salvador Island, Bahamas, is inversely related to salinity. Temperature exerts little if any control of Mg content over the range observed. Magnesium concentration in well-preserved fossil specimens of C. americana reveal paleosalinities in close agreement with results obtained from fossil ostracode assemblages, apparent sea-level-salinity relations, and sedimentological observations.

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