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Abstract
Radioarsenic was used to identify various chemical forms of arsenic, accumulated as arsenate from food or water, in a three-step food chain consisting of an autotroph, a grazer and a carnivore. Differential extraction procedures carried out on tissues from these organisms suggest that organic forms of arsenic in marine food webs are derived from an in vivo synthesis by primary producers and are efficiently transferred along a marine food chain. The muscle tissue of the carnivorous shrimp which represented the highest trophic level in this food chain could not itself form organic arsenic; in this case arsenate taken up from water was converted largely to arsenite.
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