Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada.
Environ Toxicol Chem. 2010 Mar;29(3):633-43. doi: 10.1002/etc.96.
Among-lake variation in mercury (Hg) concentrations in landlocked Arctic char was examined in 27 char populations from remote lakes across the Canadian Arctic. A total of 520 landlocked Arctic char were collected from 27 lakes, as well as sediments and surface water from a subset of lakes in 1999, 2002, and 2005 to 2007. Size, length, age, and trophic position (delta(15)N) of individual char were determined and relationships with total Hg (THg) concentrations investigated, to identify a common covariate for adjustment using analysis of covariance (ANCOVA). A subset of 216 char from 24 populations was used for spatial comparison, after length-adjustment. The influence of trophic position and food web length and abiotic characteristics such as location, geomorphology, lake area, catchment area, catchment-to-lake area ratio of the lakes on adjusted THg concentrations in char muscle tissue were then evaluated. Arctic char from Amituk Lake (Cornwallis Island) had the highest Hg concentrations (1.31 microg/g wet wt), while Tessisoak Lake (Labrador, 0.07 microg/g wet wt) had the lowest. Concentrations of THg were positively correlated with size, delta(15)N, and age, respectively, in 88, 71, and 58% of 24 char populations. Length and delta(15)N were correlated in 67% of 24 char populations. Food chain length did not explain the differences in length-adjusted THg concentrations in char. No relationships between adjusted THg concentrations in char and latitude or longitude were found, however, THg concentrations in char showed a positive correlation with catchment-to-lake area ratio. Furthermore, we conclude that inputs from the surrounding environment may influence THg concentrations, and will ultimately affect THg concentrations in char as a result of predicted climate-driven changes that may occur in Arctic lake watersheds.
内陆北极茴鱼体内汞（Hg）浓度的湖泊间差异研究于 2005 年至 2007 年间在加拿大北极偏远湖泊的 27 个茴鱼种群中进行。共从 27 个湖泊中采集了 520 条内陆北极茴鱼，以及部分湖泊的沉积物和地表水。同时，还测定了个体茴鱼的大小、长度、年龄和营养位置（δ（15）N），并研究了它们与总汞（THg）浓度之间的关系，以确定使用协方差分析（ANCOVA）进行调整的常见协变量。在长度调整后，从 24 个种群中选择了 216 个样本进行空间比较。然后，评估了营养位置和食物网长度以及湖泊位置、地貌、湖泊面积、集水区面积、集水区与湖泊面积比等非生物特征对经调整的茴鱼肌肉组织中 THg 浓度的影响。来自阿米图克湖（康沃利斯岛）的北极茴鱼体内汞浓度最高（1.31μg/g 湿重），而泰西索阿克湖（拉布拉多，0.07μg/g 湿重）体内汞浓度最低。THg 浓度分别与大小、δ（15）N 和年龄呈正相关，在 24 个茴鱼种群中，分别有 88%、71%和 58%的种群符合这一关系。长度和δ（15）N 在 67%的 24 个茴鱼种群中呈正相关。食物链长度并不能解释经长度调整的茴鱼体内 THg 浓度的差异。在经长度调整的茴鱼体内 THg 浓度与纬度或经度之间未发现任何关系，但在茴鱼体内 THg 浓度与集水区与湖泊面积比呈正相关。此外，我们得出结论，来自周围环境的输入可能会影响 THg 浓度，并可能会由于在北极湖流域可能发生的气候驱动变化而最终影响到茴鱼体内的 THg 浓度。
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