污染物营养动力学信息对公共健康至关重要，因为摄入受污染的食物可能导致有害效应。本研究在巴西亚马逊的普鲁兹尼奥湖进行，该湖是一处偏远水体，河岸人口从中获得了重要的动物蛋白质摄入。对来自92个个体的样本进行了分析，包括13个物种和四个营养性类群（食肉的、食浮游生物的、杂食性的和食鱼类的鱼），以确定微量元素（Fe、Cr、Mn、Ni、Zn、Ca、Sr、Cd、Sn、Tl和Pb）和甲基汞浓度。这些个体的样本在之前的调查中已经进行了稳定同位素（SI）测量（δ13C和δ15N），并且SI数据已与本研究生成的数据进行统计处理，以评估污染物营养动力学。甲基汞是唯一具有生物富集性的分析物，总鱼类和常驻鱼类的TMF值分别为4.65和4.55。微量元素在营养级上要么稀释，要么与营养水平无关，这与科学文献中的发现相吻合。镍在营养链中的行为与必需元素类似，这有助于讨论这种金属对鱼类的必需性。考虑到非癌症风险评估，计算得出的目标危害系数（THQ）值对于所有分析个体的甲基汞都高于1.0，只有一个个体的镍高于1.0。其他分析物的THQ值均低于1.0。版权所有 © 2023. Elsevier Inc. 发布。

Information on pollutant trophodynamics can be crucial for public health, as contaminated food consumption may lead to deleterious effects. This study was performed in Puruzinho Lake, a remote body of water in the Brazilian Amazon from which a riparian human population obtains an important part of its animal protein intake. Samples from 92 individuals, comprising 13 species and four trophic guilds (iliophagous, planktivorous, omnivorous, and piscivorous fish) were analysed for the determination of trace elements (Fe, Cr, Mn, Ni, Zn, Ca, Sr, Cd, Sn, Tl and Pb) and methylmercury concentrations. Samples from the same individuals had already been analysed for stable isotope (SI) measurements (δ13C and δ15N) in a previous investigation and the SI data have been statistically treated with those generated in this study for the evaluation of trophic dynamics of contaminants. Methylmercury was the only analyte that biomagnified, presenting TMF values of 4.65 and 4.55 for total and resident ichthyofauna, respectively. Trace elements presented either trophic dilution or independence from the trophic position, constituting a behaviour that was coherent with that found in the scientific literature. The similarity between Ni behaviour through the trophic web to that of essential elements contributes to the discussion on the essentiality of this metal to fish. Considering the Non-cancer Risk Assessment, the calculated Target Hazard Quotient (THQ) values were higher than 1.0 for all analysed individuals for methylmercury, as well as for only one individual for nickel. No other analyte rendered THQ values higher than 1.0.Copyright © 2023. Published by Elsevier Inc.