Linking mercury, carbon, and nitrogen stable isotopes in Tibetan biota: Implications for using mercury stable isotopes as source tracers

doi:10.1038/srep25394

	Linking mercury, carbon, and nitrogen stable isotopes in Tibetan biota: Implications for using mercury stable isotopes as source tracers
	Zhang, QG (Zhang, Qianggong)2; Wang, WX ; Xu, XY (Xu, Xiaoyu)1; Wang, WX (Wang, Wen-Xiong)1,3
刊名	SCIENTIFIC REPORTS
	2016
卷号	6 期号:0 页码:25394
关键词	Room-temperature Precollection Mass-independent Fractionation Trophic Transfer Methylmercury Production Inorganic Mercury Chesapeake Bay Marine Fish Food Webs Plateau Lakes
DOI	10.1038/srep25394
文献子类	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.
学科主题	自然地理学
语种	英语
WOS记录号	WOS:000375426400001
内容类型	期刊论文
源URL	[http://ir.itpcas.ac.cn/handle/131C11/7700]
专题	青藏高原研究所_图书馆
通讯作者	Wang, WX
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
推荐引用方式 GB/T 7714	Zhang, QG ,Wang, WX,Xu, XY ,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	Zhang, QG ,Wang, WX,Xu, XY ,&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	Zhang, QG ,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.