Factors Affecting Mercury Stable Isotopic Distribution in Piscivorous Fish of the Laurentian Great Lakes | |
Ryan F. Lepak; Sarah E. Janssen; Runsheng Yin; David P. Krabbenhoft; Jacob M. Ogorek; John F. DeWild; Michael T. Tate; Thomas M. Holsen; James P. Hurley | |
2018 | |
Source Publication | Environmental Science & Technology
![]() |
Volume | 52Issue:5Pages:2768-2776 |
Abstract | Identifying the sources of methylmercury (MeHg) and tracing the transformations of mercury (Hg) in the aquatic food web are important components of effective strategies for managing current and legacy Hg sources. In our previous work, we measured stable isotopes of Hg (delta Hg-202, Delta Hg-199, and Delta Hg-200) in the Laurentian Great Lakes and estimated source contributions of Hg to bottom sediment. Here, we identify isotopically distinct Hg signatures for Great Lakes trout (Salvelinus namaycush) and walleye (Sander vitreus), driven by both food-web and water-quality characteristics. Fish contain high values for odd-isotope mass independent fractionation (MIF) with averages ranging from 2.50 (western Lake Erie) to 6.18 parts per thousand (Lake Superior) in Delta Hg-199. The large range in odd-MIF reflects variability in the depth of the euphotic zone, where Hg is most likely incorporated into the food web. Even-isotope MIF (Delta Hg-200), a potential tracer for Hg from precipitation, appears both disconnected from lake sedimentary sources and comparable in fish among the five lakes. We suggest that similar to the open ocean, water-column methylation also occurs in the Great Lakes, possibly transforming recently deposited atmospheric Hg deposition. We conclude that the degree of photochemical processing of Hg is controlled by phytoplankton uptake rather than by dissolved organic carbon quantity among lakes. |
Indexed By | SCI |
Language | 英语 |
Document Type | 期刊论文 |
Identifier | http://ir.gyig.ac.cn/handle/42920512-1/8715 |
Collection | 矿床地球化学国家重点实验室 |
Affiliation | 1.Environmental Chemistry and Technology Program and Department of Civil and Environmental Engineering, University of Wisconsin-Madison, Wisconsin 53706, United States 2.United States Geological Survey, Wisconsin Water Science Center, Middleton, Wisconsin 53562, United States 3.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China 4.Department of Civil and Environmental Engineering, Clarkson University, Potsdam, New York 13699, United States 5.University of Wisconsin Aquatic Sciences Center, Madison, Wisconsin 53706, United States |
Recommended Citation GB/T 7714 | Ryan F. Lepak;Sarah E. Janssen;Runsheng Yin;David P. Krabbenhoft;Jacob M. Ogorek;John F. DeWild;Michael T. Tate;Thomas M. Holsen;James P. Hurley. Factors Affecting Mercury Stable Isotopic Distribution in Piscivorous Fish of the Laurentian Great Lakes[J]. Environmental Science & Technology,2018,52(5):2768-2776. |
APA | Ryan F. Lepak;Sarah E. Janssen;Runsheng Yin;David P. Krabbenhoft;Jacob M. Ogorek;John F. DeWild;Michael T. Tate;Thomas M. Holsen;James P. Hurley.(2018).Factors Affecting Mercury Stable Isotopic Distribution in Piscivorous Fish of the Laurentian Great Lakes.Environmental Science & Technology,52(5),2768-2776. |
MLA | Ryan F. Lepak;Sarah E. Janssen;Runsheng Yin;David P. Krabbenhoft;Jacob M. Ogorek;John F. DeWild;Michael T. Tate;Thomas M. Holsen;James P. Hurley."Factors Affecting Mercury Stable Isotopic Distribution in Piscivorous Fish of the Laurentian Great Lakes".Environmental Science & Technology 52.5(2018):2768-2776. |
Files in This Item: | Download All | |||||
File Name/Size | DocType | Version | Access | License | ||
Factors Affecting Me(369KB) | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Download |
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment