This study investigates the trophic interactions and As and Cd transfer along seven marine ecosystems in Peru. Five of these ecosystems are driven by aquaculture of the Peruvian scallop Argopecten purpuratus. A southward increased gradient of δ¹⁵N was observed among the three examined regions along the Peruvian coast. The stable isotope analysis in R (SIAR)-stable isotope mixing models helped to clarify the feeding ecology of A. purpuratus and its important predators (e.g., Bursa ventricosa, Romaleon setosum). The food items of A. purpuratus can be ranked in decreasing order of importance: seston > sediment > particulate organic matter (POM) > brackish-and-fresh water POM input, while A. purpuratus itself was found to be the main prey item for predators. The highest trophic magnification factors (TMFs) were 1.46 and 1.07 for As and Cd, respectively, and were both found at the location in front of the Illescas Reserve Zone (northern Peru). Metal biomagnification and non-biomagnification effects were found in the Peruvian marine food webs, but A. purpuratus always fitted the trophic metal magnification or bio-dilution regression model as intermediate consumer and/or prey. The TMFs and linear metal relationships implied that As contamination is a serious concern in marine ecosystems in Peru.

中文翻译：

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由秘鲁扇贝 Argopecten purpuratus 水产养殖驱动的海洋生态系统中的营养相互作用和金属转移

本研究调查秘鲁七个海洋生态系统的营养相互作用以及 As 和 Cd 转移。其中五个生态系统是由秘鲁扇贝Argopecten purpuratus的水产养殖驱动的。在秘鲁海岸的三个检查区域中观察到向南增加的 δ ^{15 N 梯度。}R (SIAR) 稳定同位素混合模型中的稳定同位素分析有助于阐明A. purpuratus及其重要捕食者（例如Bursa ventricosa、Romaleon setosum）的摄食生态。A. purpuratus的食物可以按重要性降序排列：seston > 沉积物 > 颗粒有机物 (POM) > 半咸水和淡水 POM 输入，而A. purpuratus本身被发现是捕食者的主要猎物。As 和 Cd 的最高营养放大因子 (TMF) 分别为 1.46 和 1.07，并且均在伊列斯卡斯保护区（秘鲁北部）前的位置发现。在秘鲁海洋食物网中发现了金属生物放大和非生物放大效应，但A. purpuratus作为中间消费者和/或猎物始终符合营养金属放大或生物稀释回归模型。TMFs 和线性金属关系暗示砷污染是秘鲁海洋生态系统中的一个严重问题。