气候变化领域集成服务门户(CCPortal): Isotopes and otolith chemistry provide insight into the biogeochemical history of mercury in southern flounder across a salinity gradient

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DOI	10.1039/d3em00482a
	Isotopes and otolith chemistry provide insight into the biogeochemical history of mercury in southern flounder across a salinity gradient
	Sackett, Dana K.; Chrisp, Jared K.; Farmer, Troy M.
发表日期	2024
ISSN	2050-7887
EISSN	2050-7895
起始页码	26
结束页码	2
卷号	26 期号:2
英文摘要	Methylmercury (MeHg) continues to pose a significant global health risk to wildlife and humans through fish consumption. Despite numerous advancements in understanding the mercury (Hg) cycle, questions remain about MeHg sources that accumulate in fish, particularly across transitional coastal areas, where harvest is prominent and Hg sources are numerous. Here we used a unique combination of Hg and nutrient isotopes, and otolith chemistry to trace the biogeochemical history of Hg and identify Hg sources that accumulated in an economically important fish species across Mobile Bay, Alabama (USA). Fish tissue Hg in our samples primarily originated from wet deposition within the watershed, and partly reflected legacy industrial Hg. Results also suggest that little Hg was lost through photochemical processes (<10% of fish tissue Hg underwent photochemical processes). Of the small amount that did occur, photodegradation of the organic form, MeHg, was not the dominant process. Biotic transformation processes were estimated to have been a primary driver of Hg fractionation (similar to 93%), with isotope results indicating methylation as the primary biotic fractionation process prior to Hg entering the foodweb. On a finer scale, individual lifetime estuarine habitat use influenced Hg sources that accumulated in fish and fish Hg concentrations, with runoff from terrestrial Hg sources having a larger influence on fish in freshwater regions of the estuary compared to estuarine regions. Overall, results suggest increases in Hg inputs to the Mobile Bay watershed from wet deposition, turnover of legacy sources, and runoff are likely to translate into increased uptake into the foodweb.
语种	英语
WOS研究方向	Chemistry ; Environmental Sciences & Ecology
WOS类目	Chemistry, Analytical ; Environmental Sciences
WOS记录号	WOS:001153140800001
来源期刊	ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/299601
作者单位	University System of Maryland; University of Maryland College Park; Clemson University
推荐引用方式 GB/T 7714	Sackett, Dana K.,Chrisp, Jared K.,Farmer, Troy M.. Isotopes and otolith chemistry provide insight into the biogeochemical history of mercury in southern flounder across a salinity gradient[J],2024,26(2).
APA	Sackett, Dana K.,Chrisp, Jared K.,&Farmer, Troy M..(2024).Isotopes and otolith chemistry provide insight into the biogeochemical history of mercury in southern flounder across a salinity gradient.ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS,26(2).
MLA	Sackett, Dana K.,et al."Isotopes and otolith chemistry provide insight into the biogeochemical history of mercury in southern flounder across a salinity gradient".ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS 26.2(2024).