Cascade reservoirs affect mercury concentrations in fish from Teles Pires river, Brazilian Amazon.

IF 2.4 4区环境科学与生态学 Q2 ECOLOGY Ecotoxicology Pub Date : 2025-04-01 Epub Date: 2025-01-08 DOI:10.1007/s10646-024-02847-8

Edvagner Oliveira, Daniele Kasper, Solange Aparecida Arrolho da Silva, Wilkinson Lopes Lázaro, Claumir Cesar Muniz, Giovani Spinola de Carvalho, Fernando Vieira Borges, Adriano Luiz Pimenta, Thaysa Costa Hurtado, Áurea Regina Alves Ignácio

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Abstract

Hydroelectric reservoirs favor mercury contamination in biota, but the contamination in cascade reservoirs is not yet clear. We investigated total mercury (THg) contamination in fish in four cascade reservoirs in the Brazilian Amazon between August 2022 and April 2023. Overall, downstream predatory fish showed higher mercury concentrations than those upstream. Mercury concentrations in predatory fish collected upstream increased in the reservoirs along the river. Downstream, these concentrations were consistently high, with no variation between reservoirs. Non-predatory fish did not exhibit a clear spatial trend in mercury concentrations. Considering that the synergistic effect of cascade reservoirs was evident in predatory fish, and that the species Serrasalmus rhombeus is widely distributed and important for regional fishing, we suggest it as a target species for future studies on thi issue in the region.

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梯级水库影响巴西亚马逊河泰勒斯皮雷斯河鱼类体内的汞浓度。

水电水库有利于生物区系的汞污染，但梯级水库的汞污染尚不清楚。在2022年8月至2023年4月期间，我们调查了巴西亚马逊地区四个梯级水库中鱼类的总汞污染。总体而言，下游掠食性鱼类的汞浓度高于上游。上游蓄水池中捕到的掠食性鱼类体内的汞含量增加。在下游，这些浓度一直很高，在水库之间没有变化。非掠食性鱼类的汞浓度没有明显的空间变化趋势。考虑到梯级水库对掠食性鱼类的协同效应明显，且菱形Serrasalmus rhombeus分布广泛，对区域渔业具有重要意义，我们建议将其作为该区域未来研究的目标物种。

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来源期刊

Ecotoxicology 环境科学-毒理学

CiteScore

5.30

自引率

3.70%

发文量

107

审稿时长

4.7 months

期刊介绍： Ecotoxicology is an international journal devoted to the publication of fundamental research on the effects of toxic chemicals on populations, communities and terrestrial, freshwater and marine ecosystems. It aims to elucidate mechanisms and processes whereby chemicals exert their effects on ecosystems and the impact caused at the population or community level. The journal is not biased with respect to taxon or biome, and papers that indicate possible new approaches to regulation and control of toxic chemicals and those aiding in formulating ways of conserving threatened species are particularly welcome. Studies on individuals should demonstrate linkage to population effects in clear and quantitative ways. Laboratory studies must show a clear linkage to specific field situations. The journal includes not only original research papers but technical notes and review articles, both invited and submitted. A strong, broadly based editorial board ensures as wide an international coverage as possible.