Mercury bioavailability and bioaccumulation in estuarine food webs in the Gulf of Maine.
Mercury bioavailability and bioaccumulation in estuarine food webs in the Gulf of Maine.
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DOI：
10.1021/es8017122
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发表时间：
2009-03-15
影响因子：
11.4
通讯作者：
Jackson, Brian P.
中科院分区：
文献类型：
--
作者：
Chen, Celia Y.;Dionne, Michele;Mayes, Brandon M.;Ward, Darren M.;Sturup, Stefan;Jackson, Brian P.
海洋食物网是环境中的汞与人类通过食用鱼类接触汞之间的重要联系。河口含有汞沉积物，也是人类食用的海洋鱼类和贝类物种的重要栖息地。甲基汞通过底栖和远洋途径从河口沉积物的生产地点生物转移到更高的营养水平。在这项研究中，我们研究了缅因湾汞污染梯度中汞生物转移到河口食物网的潜力。尽管不同地点的沉积物汞浓度存在差异（>100倍），但不同地点的每个物种生物群中的汞浓度仅相差2-4倍。仅沉积物污染就解释了不同地点生物群中汞和甲基汞浓度的一些变化。然而，生物地球化学和生态因素也解释了物种间汞生物累积的显着差异。污染地点沉积物中的总有机碳浓度较高，这与汞生物累积量（以生物沉积物浓度因子 BSCF 衡量）的减少有关。此外，中上层摄食动物群中的甲基汞浓度高于底栖摄食动物群（根据δ 13C测定），这表明中上层途径在甲基汞转移中的重要性。最后，总汞中甲基汞的比例随着营养级的增加而增加（以 delta 15N 测量）。这些结果揭示了生物地球化学和生态因素在决定河口食物网中甲基汞的生物利用度和营养转移方面的重要性。
Marine food webs are important links between Hg in the environment and human exposure via consumption of fish. Estuaries contain sediment repositories of Hg and are also critical habitat for marine fish and shellfish species consumed by humans. MeHg biotransfers from sites of production in estuarine sediments to higher trophic levels via both benthic and pelagic pathways. In this study, we investigated the potential for Hg biotransfer to estuarine food webs across a Hg contamination gradient in the Gulf of Maine. Despite the variation in sediment Hg concentrations across sites (>100 fold), Hg concentrations in biota ranged by only 2–4 fold for each species across sites. Sediment contamination alone explained some variation in Hg and MeHg concentrations in biota across sites. However, biogeochemical and ecological factors also explained significant variation in Hg bioaccumulation across species. Contaminated sites had higher total organic carbon concentrations in sediments, which related to a decrease in Hg bioaccumulation (measured as biota-sediment concentration factors, BSCF). Moreover, concentrations of MeHg were higher in pelagic-feeding than benthic-feeding fauna (determined from delta 13C) indicating the importance of pelagic pathways in transferring MeHg. Lastly, the proportion of total Hg as MeHg increased with trophic level (measured as delta 15N). These results reveal the importance of both biogeochemical and ecological factors in determining the bioavailability and trophic transfer of MeHg in estuarine food webs.
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影响因子：
11.4
作者：
Lambertsson, L;Nilsson, M
通讯作者：
Nilsson, M
影响因子：
3
作者：
Long, ER
通讯作者：
Long, ER
DOI：
10.1007/s002540050072
发表时间：
1996-07-01
期刊：
ENVIRONMENTAL GEOLOGY
影响因子：
--
作者：
Loring, DH;Asmund, G
通讯作者：
Asmund, G
影响因子：
2.8
作者：
Covelli, S;Faganeli, J;Brambati, A
通讯作者：
Brambati, A
影响因子：
3
作者：
Heyes, A;Miller, C;Mason, RP
通讯作者：
Mason, RP