Azevedo Lucas Silva, Pestana Inácio Abreu, Nery Adriely Ferreira da Costa, Bastos Wanderley Rodrigues, Souza Cristina Maria Magalhães
Laboratório de Ciências Ambientais, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, Rio de Janeiro, RJ, CEP: 28013-602, Brazil.
Laboratório de Biogeoquímica Ambiental, Universidade Federal de Rondônia, Porto Velho, RO, CEP: 76815-800, Brazil.
Ecotoxicology. 2019 May;28(4):478-485. doi: 10.1007/s10646-019-02044-y. Epub 2019 Apr 25.
Hg accumulation in fish is influenced by several factors including seasonality. In the Amazon, ecosystems are marked by strong seasonal variation in precipitation, which leads to drastic changes in the water level of lakes and rivers. The aim of this study was to evaluate Hg levels in muscle of detritivorous, herbivorous and omnivorous fish from an Amazon lake (Madeira River Basin, Amazonas, Brazil) over four seasons (rising water, high water, falling water and low water). We hypothesized that total Hg concentration varies during the seasons. The results indicate that total Hg levels in detritivorous fish were higher in rising and low water seasons while in herbivorous and omnivorous fish the total Hg concentration was higher during the rising water season. The hypothesis was supported by the results. Additionally, the study provides evidence that Hg levels in fish with different feeding habits are influenced by the flood pulse of the Amazon region.
鱼类体内汞的积累受多种因素影响，包括季节性。在亚马逊地区，生态系统的特点是降水具有强烈的季节性变化，这导致湖泊和河流的水位发生剧烈变化。本研究的目的是评估来自巴西亚马逊州马德拉河流域一个亚马逊湖泊的食碎屑性、草食性和杂食性鱼类在四个季节（涨水期、高水位期、落水期和低水位期）肌肉中的汞含量。我们假设总汞浓度在不同季节会有所变化。结果表明，食碎屑性鱼类的总汞含量在涨水期和低水位期较高，而草食性和杂食性鱼类的总汞浓度在涨水期较高。研究结果支持了这一假设。此外，该研究提供了证据表明，亚马逊地区的洪水脉冲会影响不同食性鱼类的汞含量。
