San Francisco Estuary Institute, 7770 Pardee Lane, Oakland, CA 94621, USA.
Environ Pollut. 2010 Aug;158(8):2716-24. doi: 10.1016/j.envpol.2010.04.010.
In the San Francisco Estuary, management actions including tidal marsh restoration could change fish mercury (Hg) concentrations. From 2005 to 2007, small forage fish were collected and analyzed to identify spatial and interannual variation in biotic methylmercury (MeHg) exposure. The average whole body total Hg concentration was 0.052 microg g(-1) (wet-weight) for 457 composite samples representing 13 fish species. MeHg constituted 94% of total Hg. At a given length, Hg concentrations were higher in nearshore mudflat and wetland species (Clevelandia ios, Menidia audens, and Ilypnus gilberti), compared to species that move offshore (e.g., Atherinops affinis and Lepidogobius lepidus). Gut content analysis indicated similar diets between Atherinops affinis and Menidia audens, when sampled at the same locations. Hg concentrations were higher in sites closest to the Guadalupe River, which drains a watershed impacted by historic Hg mining. Results demonstrate that despite differences among years and fish species, nearshore forage fish exhibit consistent Hg spatial gradients.
在旧金山湾，管理措施，包括潮汐沼泽恢复，可以改变鱼类汞（Hg）浓度。从 2005 年到 2007 年，采集了小型饲料鱼，并对其进行了分析，以确定生物甲基汞（MeHg）暴露的空间和年际变化。13 种鱼类的 457 个组合样本的平均全身体总汞浓度为 0.052 微克/克（湿重）。MeHg 占总 Hg 的 94%。在给定的长度下，与向近海移动的物种（如 Atherinops affinis 和 Lepidogobius lepidus）相比，近岸泥滩和湿地物种（Clevelandia ios、Menidia audens 和 Ilypnus gilberti）的 Hg 浓度更高。在相同地点取样时，Atherinops affinis 和 Menidia audens 的肠道内容物分析表明它们的饮食相似。Hg 浓度在离瓜达卢佩河最近的地点最高，该河流流经一个受历史汞矿影响的流域。结果表明，尽管各年和鱼类物种之间存在差异，但近岸饲料鱼表现出一致的 Hg 空间梯度。
