Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden.
Chemosphere. 2012 Feb;86(5):439-45. doi: 10.1016/j.chemosphere.2011.09.037. Epub 2011 Oct 19.
Adequate temporal trend analysis of mercury (Hg) in freshwater ecosystems is critical to evaluate if actions from the human society have affected Hg concentrations ([Hg]) in fresh water biota. This study examined temporal change in [Hg] in Northern pike (Esox lucius L.) in Swedish freshwater lakes between 1994 and 2006. To achieve this were lake-specific, multiple-linear-regression models used to estimate pike [Hg], including indicator variables representing time and fish weight and their interactions. This approach permitted estimation of the direction and magnitude of temporal changes in 25 lakes selected from the Swedish national database on Hg in freshwater biota. A significant increase was found in 36% of the studied lakes with an average increase in pike [Hg] of 3.7±6.7% per year that was found to be positively correlated with total organic carbon. For lakes with a significant temporal change the dataset was based on a mean of 30 fish, while for lakes with no temporal change it was based on a mean of 13 fish.
充分的汞（Hg）时间趋势分析对于评估人类社会的行动是否影响淡水生物群中 Hg 浓度（[Hg]）至关重要。本研究考察了 1994 年至 2006 年间瑞典淡水湖泊中北方狗鱼（Esox lucius L.）中[Hg]的时间变化。为此，使用特定于湖泊的多元线性回归模型来估计狗鱼[Hg]，包括代表时间和鱼体重及其相互作用的指示变量。这种方法允许从瑞典淡水生物群 Hg 国家数据库中选择的 25 个湖泊估计时间变化的方向和幅度。研究发现，在所研究的湖泊中有 36%的湖泊呈显著增加趋势，狗鱼[Hg]的平均年增长率为 3.7±6.7%，与总有机碳呈正相关。对于有显著时间变化的湖泊，数据集基于平均 30 条鱼，而对于没有时间变化的湖泊，数据集基于平均 13 条鱼。
