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学科主题: 地理学::自然地理学
题名: Linking mercury, carbon, and nitrogen stable isotopes in Tibetan biota: Implications for using mercury stable isotopes as source tracers
作者: Xu, XY (Xu, Xiaoyu)1; Zhang, QG (Zhang, Qianggong)2; Wang, WX (Wang, Wen-Xiong)1, 3
通讯作者: Wang, WX
刊名: SCIENTIFIC REPORTS
发表日期: 2016
DOI: 10.1038/srep25394
卷: 6, 期:0, 页:25394
收录类别: SCI
合作性质: 国内
文章类型: Article
英文摘要: Tibetan 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.
语种: 英语
WOS记录号: WOS:000375426400001
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7700
Appears in Collections:图书馆_期刊论文

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作者单位: 1.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:
Xu, XY ,Zhang, QG ,Wang, WX . 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.
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