Trophic interactions and metal transfer in marine ecosystems driven by the Peruvian scallop <i>Argopecten purpuratus</i> aquaculture

Abstract This study investigates the trophic interactions and As Cd transfer along seven marine ecosystems in Peru. Five of these are driven by aquaculture Peruvian scallop Argopecten purpuratus . A southward increased gradient δ 15 N was observed among three examined regions coast. The stable isotope analysis R (SIAR)‐stable mixing models helped to clarify feeding ecology A. its important predators (e.g., Bursa ventricosa , Romaleon setosum ). food items can be ranked decreasing order importance: seston &gt; sediment particulate organic matter (POM) brackish‐and‐fresh water POM input, while itself found main prey item for predators. highest magnification factors (TMFs) were 1.46 1.07 Cd, respectively, both at location front Illescas Reserve Zone (northern Peru). Metal biomagnification non‐biomagnification effects webs, but always fitted metal or bio‐dilution regression model as intermediate consumer and/or prey. TMFs linear relationships implied that contamination is a serious concern