Oliveira Edvagner, Kasper Daniele, da Silva Solange Aparecida Arrolho, Lázaro Wilkinson Lopes, Muniz Claumir Cesar, de Carvalho Giovani Spinola, Borges Fernando Vieira, Pimenta Adriano Luiz, Hurtado Thaysa Costa, Ignácio Áurea Regina Alves
Programa de Pós‑Graduação em Ciências Ambientais, Centro de Pesquisa em Limnologia, Biodiversidade e Etnobiologia do Pantanal, Universidade do Estado de Mato Grosso, Cáceres, Mato Grosso, Brasil.
Instituto de Ciências Biológicas da Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil.
Ecotoxicology. 2025 Apr;34(3):444-455. doi: 10.1007/s10646-024-02847-8. Epub 2025 Jan 8.
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.
水电站水库容易造成生物群中的汞污染，但梯级水库中的污染情况尚不清楚。我们于2022年8月至2023年4月期间调查了巴西亚马逊地区四个梯级水库中鱼类的总汞（THg）污染情况。总体而言，下游的掠食性鱼类汞浓度高于上游鱼类。上游采集的掠食性鱼类的汞浓度在沿河流的水库中有所增加。在下游，这些浓度一直很高，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趋势。鉴于梯级水库的协同效应在掠食性鱼类中很明显，并且菱形锯脂鲤物种分布广泛且对区域渔业很重要，我们建议将其作为该地区未来关于此问题研究的目标物种。
