On the basis of examinations of the gut content, a food chain which ends at the predatory ichthyôphagous Esox lucius was identified. The results are reported of a comparative gamma-ray spectra study carried out on the ashes of organisms belonging to three trophic levels taken from a stretch of the Po river. The largest number of radioelements under examination (65Zn, 60Co, 54Mn, 95Zr, 95Nb, 40K, 134Cs, 137Cs and 90Sr) were found at a level of the primary producers. A first qualitative reduction was verified in the passage to the primary consumers. A more drastic discrimination was noted in the passage to the secondary consumer Esox lucius.
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Con il contributo del Ministero per i Beni e le Attività Culturali