气候变化领域集成服务门户(CCPortal): Linking mercury, carbon, and nitrogen stable isotopes in Tibetan biota: Implications for using mercury stable isotopes as source tracers

CCPortal

DOI	10.1038/srep25394
	Linking mercury, carbon, and nitrogen stable isotopes in Tibetan biota: Implications for using mercury stable isotopes as source tracers
	Xu, Xiaoyu; Zhang, Qianggong; Wang, Wen-Xiong
通讯作者	Wang, WX (通讯作者)
发表日期	2016
ISSN	2045-2322
卷号	6
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.
关键词	MASS-INDEPENDENT FRACTIONATION TROPHIC TRANSFER METHYLMERCURY PRODUCTION INORGANIC MERCURY FISH LAKE WATER PLATEAU RIVER HG
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000375426400001
来源期刊	SCIENTIFIC REPORTS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258660
推荐引用方式 GB/T 7714	Xu, Xiaoyu,Zhang, Qianggong,Wang, Wen-Xiong. Linking mercury, carbon, and nitrogen stable isotopes in Tibetan biota: Implications for using mercury stable isotopes as source tracers[J]. 中国科学院青藏高原研究所,2016,6.
APA	Xu, Xiaoyu,Zhang, Qianggong,&Wang, Wen-Xiong.(2016).Linking mercury, carbon, and nitrogen stable isotopes in Tibetan biota: Implications for using mercury stable isotopes as source tracers.SCIENTIFIC REPORTS,6.
MLA	Xu, Xiaoyu,et al."Linking mercury, carbon, and nitrogen stable isotopes in Tibetan biota: Implications for using mercury stable isotopes as source tracers".SCIENTIFIC REPORTS 6(2016).