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Linking mercury, carbon, and nitrogen stable isotopes in Tibetan biota: Implications for using mercury stable isotopes as source tracers
Xu, XY (Xu, Xiaoyu)1; Zhang, QG (Zhang, Qianggong)2; Wang, WX (Wang, Wen-Xiong)1,3; Wang, WX
Source PublicationSCIENTIFIC REPORTS
2016
Volume6Issue:0Pages:25394
DOI10.1038/srep25394
AbstractTibetan Plateau is located at a mountain region isolated from direct anthropogenic sources. Mercury concentrations and stable isotopes of carbon, nitrogen, and mercury were analyzed in sediment and biota for Nam Co and Yamdrok Lake. Biotic mercury concentrations and high food web magnification factors suggested that Tibetan Plateau is no longer a pristine site. The primary source of methylmercury was microbial production in local sediment despite the lack of direct methylmercury input. Strong ultraviolet intensity led to extensive photochemical reactions and up to 65% of methylmercury in water was photo-demethylated before entering the food webs. Biota displayed very high Delta Hg-199 signatures, with some highest value (8.6%) ever in living organisms. The delta Hg-202 and Delta Hg-199 in sediment and biotic samples increased with trophic positions (delta N-15) and % methylmercury. Fish total length closely correlated to delta C-13 and Delta Hg-199 values due to dissimilar carbon sources and methylmercury pools in different living waters. This is the first mercury isotope study on high altitude lake ecosystems that demonstrated specific isotope fractionations of mercury under extreme environmental conditions.
Subject Area自然地理学
WOS IDWOS:000375426400001
Language英语
Indexed BySCI
KeywordRoom-temperature Precollection Mass-independent Fractionation Trophic Transfer Methylmercury Production Inorganic Mercury Chesapeake Bay Marine Fish Food Webs Plateau Lakes
Cooperation Status国内
Department环境
SubtypeArticle
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Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/7700
Collection图书馆
Corresponding AuthorWang, WX
Affiliation1.Hong Kong Univ Sci & Technol, Div Life Sci, Kowloon, Hong Kong, Peoples R China
2.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China
3.Chinese Acad Sci, Inst Geochemistry, State Key Lab Environm Geochem, Guiyang 550002, Peoples R China
Recommended Citation
GB/T 7714
Xu, XY ,Zhang, QG ,Wang, WX ,et al. Linking mercury, carbon, and nitrogen stable isotopes in Tibetan biota: Implications for using mercury stable isotopes as source tracers[J]. SCIENTIFIC REPORTS,2016,6(0):25394.
APA Xu, XY ,Zhang, QG ,Wang, WX ,&Wang, WX.(2016).Linking mercury, carbon, and nitrogen stable isotopes in Tibetan biota: Implications for using mercury stable isotopes as source tracers.SCIENTIFIC REPORTS,6(0),25394.
MLA Xu, XY ,et al."Linking mercury, carbon, and nitrogen stable isotopes in Tibetan biota: Implications for using mercury stable isotopes as source tracers".SCIENTIFIC REPORTS 6.0(2016):25394.
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