Contrasting Spatial and Seasonal Trends of Methylmercury Exposure Pathways of Arctic Seabirds: Combination of Large-Scale Tracking and Stable Isotopic Approaches.
Contrasting Spatial and Seasonal Trends of Methylmercury Exposure Pathways of Arctic Seabirds: Combination of Large-Scale Tracking and Stable Isotopic Approaches.
复制标题
对比北极海鸟甲基汞暴露途径的空间和季节趋势：大规模跟踪和稳定同位素方法的结合。
DOI：
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发表时间：
2020
影响因子：
11.4
通讯作者：
J. Fort
中科院分区：
文献类型：
--
作者：
M. Renedo;D. Amouroux;C. Albert;S. Bérail;V. Bråthen;M. Gavrilo;D. Grémillet;H. Helgason;D. Jakubas;A. Mosbech;H. Strøm;E. Tessier;K. Wojczulanis;P. Bustamante;J. Fort
尽管北极环极地区的直接人为汞(Hg)输入有限，但在北极海洋生物体内积累了高浓度的甲基汞(MeHg)。然而，这些生态系统中甲基汞的生产和生物积累途径尚未完全揭开。我们测量了来自五个北极繁殖群体的地理定位仪追踪的小海雀的羽毛和血液中的汞浓度和汞、碳和氮的稳定同位素比率。这种食浮性海鸟的大范围空间迁移率和特定组织汞整合时间允许探索它们的空间(越冬季节/繁殖地)和季节性(非繁殖期/繁殖期)的甲基汞暴露。头羽汞浓度(1.74~3.48μg·g-1)由东向西递增，伴随着汞同位素(尤其是Δ199Hg：0.96~1.13‰)和碳同位素(δ13C：-20.6~-19.4‰)比值的显著空间变化。这些趋势表明，北大西洋西部和北极东部地区之间存在着明显的甲基汞来源混合/比例。北部殖民地较高的Δ199Hg值(+0.4MHg值)表明，受光化学影响较大的‰积聚，支持了北极高水域浅层Me Hgg的生产和生物积累。海鸟组织同位素分析和空间追踪相结合有助于在不同的时空尺度上追踪甲基汞的来源。
Despite the limited direct anthropogenic mercury (Hg) inputs in the circumpolar Arctic, elevated concentrations of methylmercury (MeHg) are accumulated in Arctic marine biota. However, the MeHg production and bioaccumulation pathways in these ecosystems have not been completely unraveled. We measured Hg concentrations and stable isotope ratios of Hg, carbon, and nitrogen in the feathers and blood of geolocator-tracked little auk Alle alle from five Arctic breeding colonies. The wide-range spatial mobility and tissue-specific Hg integration times of this planktivorous seabird allowed the exploration of their spatial (wintering quarters/breeding grounds) and seasonal (nonbreeding/breeding periods) MeHg exposures. An east-to-west increase of head feather Hg concentrations (1.74-3.48 μg·g-1) was accompanied by significant spatial trends of Hg isotope (particularly Δ199Hg: 0.96-1.13‰) and carbon isotope (δ13C: -20.6 to -19.4‰) ratios. These trends suggest a distinct mixing/proportion of MeHg sources between western North Atlantic and eastern Arctic regions. Higher Δ199Hg values (+0.4‰) in northern colonies indicate an accumulation of more photochemically impacted MeHg, supporting shallow MeHg production and bioaccumulation in high Arctic waters. The combination of seabird tissue isotopic analysis and spatial tracking helps in tracing the MeHg sources at various spatio-temporal scales.
影响因子：
8.3
作者：
Mason RP;Choi AL;Fitzgerald WF;Hammerschmidt CR;Lamborg CH;Soerensen AL;Sunderland EM
通讯作者：
Sunderland EM
影响因子：
11.4
作者：
Miling Li;A. Schartup;A. Valberg;Jessica D. Ewald;D. Krabbenhoft;R. Yin;P. Balcom;E. Sunderland
通讯作者：
Miling Li;A. Schartup;A. Valberg;Jessica D. Ewald;D. Krabbenhoft;R. Yin;P. Balcom;E. Sunderland
影响因子：
11.4
作者：
Kwon, Sae Yun;Blum, Joel D.;Carvan, Michael J.;Basu, Niladri;Head, Jessica A.;Madenjian, Charles P.;David, Solomon R.
通讯作者：
David, Solomon R.