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首页> 外文期刊>Ecotoxicology >Environmental, geographic and trophic influences on methylmercury concentrations in macroinvertebrates from lakes and wetlands across Canada
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Environmental, geographic and trophic influences on methylmercury concentrations in macroinvertebrates from lakes and wetlands across Canada

机译：环境，地理和营养因素对加拿大湖泊和湿地大型无脊椎动物中甲基汞浓度的影响

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Macroinvertebrates are a key vector in the transfer of methylmercury (MeHg) to fish. However, the factors that affect MeHg concentrations and bioaccumulation in these organisms are not as well understood as for fish, and studies on a broad geographic scale are lacking. In this study, we gathered published and unpublished MeHg and carbon (δ13C) and nitrogen (δ15N) stable isotope data for freshwater macroinvertebrates from 119 lakes and wetlands across seven Canadian provinces, along with selected physical, chemical and biological characteristics of these systems. Overall, water pH was the most important determinant of MeHg concentrations in both predatory and non-predatory invertebrates [Radj 2 = 0.32, p 0.001; multivariate canonical redundancy analysis (RDA)]. The location of lakes explained additional variation in invertebrate MeHg (partial R2 = 0.08 and 0.06 for latitude and longitude, respectively; RDA), with higher concentrations in more easterly and southerly regions. Both invertebrate foraging behaviour and trophic position (indicated by functional feeding groups and δ15N values, respectively) also predicted MeHg concentrations in the organisms. Collectively, results indicate that in addition to their feeding ecology, invertebrates accumulate more MeHg in acidic systems where the supply of MeHg to the food web is typically high. MeHg concentrations in macroinvertebrates may also be influenced by larger-scale geographic differences in atmospheric mercury deposition among regions.
机译：无脊椎动物是甲基汞（MeHg）向鱼类转移的关键媒介。但是，影响这些生物中甲基汞浓度和生物蓄积的因素还不像鱼类那样容易理解，因此缺乏广泛的地理研究。在这项研究中，我们收集了来自加拿大七个省的119个湖泊和湿地的淡水大型无脊椎动物的已发表和未发表的MeHg和碳（δ13C）和氮（δ15N）稳定同位素数据，以及这些系统的选定物理，化学和生物学特征。总的来说，在掠食性和非掠食性无脊椎动物中，水的pH值是MeHg浓度的最重要决定因素[Radj 2 = 0.32，p <0.001;多元规范冗余分析（RDA）]。湖泊的位置解释了无脊椎动物MeHg的其他变化（纬度和经度分别为部分R2 = 0.08和0.06; RDA），并且在东风和南风区域浓度更高。无脊椎动物的觅食行为和营养位置（分别由功能性进食组和δ15N值指示）也预测了生物体中的甲基汞浓度。总体而言，结果表明，除了其摄食生态学以外，无脊椎动物在酸性系统中会积累更多的甲基汞，在酸性系统中，食物网中甲基汞的供应量通常很高。大型无脊椎动物中的MeHg浓度也可能受区域之间大气汞沉积的更大范围地理差异的影响。

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