Abstract
Crassostrea virginica (Gmelin) collected in 1989 from several sites within the Chesapeake Bay have narrower salinity tolerances than conspecific oysters collected in 1989 from several Atlantic coast sites (Georgia to Cape Cod). The basis of this physiological difference appears to be the biochemical mechanisms that control cellular osmolality following salinity stress. When adapted to the same salinity, the amino acid pools of both gill and adductor muscles of Atlantic oysters are larger than those of Bay oysters and different in composition. The Atlantic oyster tissues rely primarily on taurine for salinity tolerance, while the Bay oyster tissues have relatively less taurine, depending instead upon alanine, glycine and proline to adapt to high salinity. In addition, Atlantic oyster gill and adductor have 10 to 25 times the glycine betaine concentrations of these tissues from Bay oysters, depending upor the salinity of acclimation. The betaine concentration varies with salinity in Atlantic oysters, but does not change in Bay oysters. The results suggest that these biochemical differences are the basis of the narrower salinity tolerance in Bay oysters. The biochemical differences may reflect genetic differences between Bay and Atlantic oysters.
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Communicated by J. Grassle, New Brunswick
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Pierce, S.K., Rowland-Faux, L.M. & O'Brien, S.M. Different salinity tolerance mechanisms in Atlantic and Chesapeake Bay conspecific oysters: glycine betaine and amino acid pool variations. Marine Biology 113, 107–115 (1992). https://doi.org/10.1007/BF00367644
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DOI: https://doi.org/10.1007/BF00367644