{"refrec":{"BRefID":331406,"RR":"<b>Blum, J.D.; Drazen, J.C.; Johnson, M.W.; Popp, B.N.; Motta, L.C.; Jamieson, A.J.</b> (2020). Mercury isotopes identify near-surface marine mercury in deep-sea trench biota. <i>Proc. Natl. Acad. Sci. U.S.A. 117(47)</i>: 29292-29298. <a href=\"https://dx.doi.org/10.1073/pnas.2012773117\" target=\"_blank\">https://dx.doi.org/10.1073/pnas.2012773117</a>","BEntID":325017,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Proc. Natl. Acad. Sci. U.S.A. 117(47)</i>: 29292-29298. <a href=\"https://dx.doi.org/10.1073/pnas.2012773117\" target=\"_blank\">https://dx.doi.org/10.1073/pnas.2012773117</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Blum, J.D.; Drazen, J.C.; Johnson, M.W.; Popp, B.N.; Motta, L.C.; Jamieson, A.J.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Blum, J.D. <i>et al.</i>","Englishabstract":"Mercury isotopic compositions of amphipods and snailfish from deep-sea trenches reveal information on the sources and transformations of mercury in the deep oceans. Evidence for methyl-mercury subjected to photochemical degradation in the photic zone is provided by odd-mass independent isotope values (Δ<sup>199</sup>Hg) in amphipods from the Kermadec Trench, which average 1.57‰ (±0.14, <em>n</em> = 12, SD), and amphipods from the Mariana Trench, which average 1.49‰ (±0.28, <em>n</em> = 13). These values are close to the average value of 1.48‰ (±0.34, <em>n</em> = 10) for methyl-mercury in fish that feed at ∼500-m depth in the central Pacific Ocean. Evidence for variable contributions of mercury from rainfall is provided by even-mass independent isotope values (Δ<sup>200</sup>Hg) in amphipods that average 0.03‰ (±0.02, <em>n</em> = 12) for the Kermadec and 0.07‰ (±0.01, <em>n</em> = 13) for the Mariana Trench compared to the rainfall average of 0.13 (±0.05, <em>n</em> = 8) in the central Pacific. Mass-dependent isotope values (δ<sup>202</sup>Hg) are elevated in amphipods from the Kermadec Trench (0.91 ±0.22‰, <em>n</em> = 12) compared to the Mariana Trench (0.26 ±0.23‰, <em>n</em> = 13), suggesting a higher level of microbial demethylation of the methyl-mercury pool before incorporation into the base of the foodweb. Our study suggests that mercury in the marine foodweb at ∼500 m, which is predominantly anthropogenic, is transported to deep-sea trenches primarily in carrion, and then incorporated into hadal (6,000-11,000-m) food webs. Anthropogenic Hg added to the surface ocean is, therefore, expected to be rapidly transported to the deepest reaches of the oceans.","AbstractOtherLang":" ","BibLvlCode":"AS","StandardTitle":"Mercury isotopes identify near-surface marine mercury in deep-sea trench biota","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-15 01:33:27.303600","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"isotope, Trench","OtherDescriptors":null,"Notes":null,"AnaPub":2020,"MonPub":null,"DateUpdate":"2020-11-26","DateCreate":"2020-11-26","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000593988400015","VABBcode":null,"OpenAcc":1,"DOI":"10.1073/pnas.2012773117"},"refs":null,"anarec":{"AnaID":331406,"PubliDate":2020,"Pagination":"29292-29298","XtraPublOfAnaID":null,"ISBN":null,"Volume":"117","Issue":"47","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43690,"SerRR":"Proceedings of the National Academy of Sciences of the United States of America. 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