1995-2021 年康涅狄格州水体中大口黑鲈汞浓度的时空变化。
Spatiotemporal changes in largemouth bass mercury concentrations from Connecticut waterbodies, 1995-2021.
机构信息
Department of Natural Resources and the Environment, Wildlife and Fisheries Conservation Center, University of Connecticut, 1376 Storrs Road, Storrs, CT, 06269-4087, USA.
Center for Environmental Sciences and Engineering, University of Connecticut, 1376 Storrs Road, Storrs, CT, 06269-4087, USA.
出版信息
Environ Monit Assess. 2023 May 31;195(6):780. doi: 10.1007/s10661-023-11405-4.
We evaluated spatiotemporal changes in the mean and variation in largemouth bass (Micropterus salmoides) mercury concentrations over three discrete time periods (1995, 2005-2006, and 2019-2021) across 56 Connecticut waterbodies. We detected largemouth bass raw mercury concentrations that exceeded the US Environmental Protection Agency (USEPA) Fish Tissue Residue Criterion (≥ 0.30 µg g ww) in 75.1%, 63.3%, and 47.7% of all fish sampled during 1995, 2005-2006, and 2019-2021, respectively. Total length (TL)-adjusted largemouth bass mercury concentrations declined across all ecoregions in Connecticut between subsequent sampling periods but increased between 2005-2006 and 2019-2021 in the Northwest Hills/Uplands ecoregion. The coefficient of variation (CV) of largemouth bass TL-adjusted mercury concentrations increased through time, increasing from 25.78% during 1995 to 36.47% during 2019-2021. The probability of a largemouth bass having a raw mercury concentration > 0.30 µg g ww increased with total length (TL), but the TL with a 50% probability varied across ecoregions and periods. The variation in largemouth bass mercury concentrations highlights the roles that changes to individual behaviors, food web structure, lake properties, and legacy mercury may play in shaping broad patterns and trends in mercury consumption risks.
我们评估了在三个不同时间段（1995 年、2005-2006 年和 2019-2021 年）内，56 个康涅狄格州水体中大口黑鲈（Micropterus salmoides）汞浓度的均值和变异的时空变化。我们检测到 1995 年、2005-2006 年和 2019-2021 年期间，分别有 75.1%、63.3%和 47.7%的所有采样鱼类的原始汞浓度超过美国环境保护署（USEPA）鱼类组织残留标准（≥0.30μg g ww）。在康涅狄格州所有生态区，所有鱼类的体长（TL）校正后大口黑鲈汞浓度在随后的采样期之间呈下降趋势，但在 2005-2006 年和 2019-2021 年之间，西北部丘陵/高地生态区的汞浓度增加。体长校正后大口黑鲈汞浓度的变异系数（CV）随时间增加，从 1995 年的 25.78%增加到 2019-2021 年的 36.47%。大口黑鲈原始汞浓度>0.30μg g ww 的概率随体长（TL）增加而增加，但 50%概率的 TL 因生态区和时期而异。大口黑鲈汞浓度的变化突出了个体行为、食物网结构、湖泊特性和遗留汞等变化在塑造汞摄入风险的广泛模式和趋势方面所起的作用。
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