Abstract
The interaction of Se with Cd was studied in Eledone cirrhosa in the northern Tyrrhenian Sea. From the results it appeared that in this organism the concentration of the two elements in mantle muscle tissue decreased from the beginning to the end of the life cycle until they were comparable with those of other studied organisms from the same area. The variation of selenium concentration was satisfactorily described by an equation obtained by fitting the experiment set of data and considering the Se concentration related both to that of Cd and to the length of the specimen. The variation of Se was partially explained with the interaction of Cd with a molar ratio of 1:1, hypothesizing a protection mechanism based on the formation and subsequent release from the body of a Cd-Se complex, while the remaining variation of Se concentration, related to that of the length of the specimen, was explained with metabolic and/or physiological variations over the life cycle of Eledone.
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