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Seasonality of Dipteran-Mediated Methylmercury Flux from Ponds

机译：Dipteran介导的池塘中甲基汞通量的季节性

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Methylmercury (MeHg) is an aquatic contaminant that can be transferred to terrestrial predators by emergent aquatic insects. We assessed the effects of month and pond permanence on dipteran-mediated MeHg flux (calculated as emergent dipteran biomassxdipteran MeHg concentration) in 10 experimental ponds. Emergent dipterans were collected weekly from permanent ponds with bluegill (Lepomis macrochirus; n=5) and semipermanent ponds without fish (n=5) over a 7-mo period (February-August, 2015). We detected a significant effect of month on MeHg flux from 6 dipteran taxa and aggregate MeHg flux, with the highest MeHg flux from herbivorous/detritivorous chironomid midges and predatory midges in March; biting midges, phantom midges and herbivorous/detritivorous orthoclad midges in April; and mosquitoes in August. Aggregate dipteran-mediated MeHg flux peaked in April and then declined throughout the remainder of the summer. We did not detect a significant main effect of pond permanence or a significant monthxpond permanence interaction effect on MeHg flux for any of the taxa examined in the present study or for aggregate MeHg flux. Given their ubiquity in aquatic systems and their importance in food webs at the land-water interface, dipterans are important taxa that should not be overlooked as a part of the Hg cycle. Environ Toxicol Chem 2018;37:1846-1851. (c) 2018 SETAC
机译：甲基汞（MeHg）是一种水生污染物，可被新兴水生昆虫转移至陆地捕食者。我们评估了10个实验池塘中月和池塘永久性对敌百虫介导的MeHg通量的影响（以出现的敌百虫生物量x敌百虫MeHg浓度计算）。在7个月内，每周从有蓝blue的永久性池塘（Lepomis macrochirus; n = 5）和无鱼的半永久性池塘（n = 5）收集每周出现的dip生动物（2015年2月至8月）。我们检测到一个月对6个双翅类类群的MeHg通量和总MeHg通量的显着影响，其中3月份来自草食性/有害性拟南芥mid和掠食性mid的MeHg通量最高； 4月份咬咬mid，幻影mid和草食性/有害性直立mid。和八月的蚊子。二甲醚介导的MeHg总量在四月份达到峰值，然后在整个夏季剩余时间内下降。对于本研究中研究的任何一种类群或总的MeHg通量，我们都没有检测到池塘永久性对MeHg通量有显着的主要影响或月度与池塘永久性交互作用。由于它们在水生系统中无处不在，并且在陆水界面的食物网中也很重要，因此双足类动物是重要的生物分类，在汞循环中不应被忽视。 Environ Toxicol Chem 2018; 37：1846-1851。 （c）2018年SETAC

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