干旱区生态环境知识资源中心(Arid): Reservoir Stratification Modulates the Influence of Impoundments on Fish Mercury Concentrations along an Arid Land River System

Arid

DOI	10.1021/acs.est.3c04646
	Reservoir Stratification Modulates the Influence of Impoundments on Fish Mercury Concentrations along an Arid Land River System
	Willacker, James J.; Eagles-Smith, Collin A.; Chandler, James A.; Naymik, Jesse; Myers, Ralph; Krabbenhoft, David P.
通讯作者	Eagles-Smith, CA
来源期刊	ENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN	0013-936X
EISSN	1520-5851
出版年	2023
卷号	57 期号:50 页码:21313-21326
英文摘要	Impoundment is among the most common hydrologic alterations with impacts on aquatic ecosystems that can include effects on mercury (Hg) cycling. However, landscape-scale differences in Hg bioaccumulation between reservoirs and other habitats are not well characterized nor are the processes driving these differences. We examined total Hg (THg) concentrations of Smallmouth Bass (Micropterus dolomieu) collected from reservoir, tailrace, and free-flowing reaches along an 863 km segment of the Snake River, USA, a semiarid river with 22 impoundments along its course. Across three size-classes (putative 1-year-old, first reproductive, and harvestable sized fish), THg concentrations in reservoirs and tailraces averaged 76% higher than those in free-flowing segments. Among reservoirs, THg concentrations were highest in reservoirs with inconsistent stratification patterns, 47% higher than annually stratified, and 144% higher than unstratified reservoirs. Fish THg concentrations in tailraces immediately downstream of stratified reservoirs were higher than those below unstratified (38-130%) or inconsistently stratified (32-79%) reservoirs. Stratification regimes influenced the exceedance of fish and human health benchmarks, with 52-80% of fish from stratifying reservoirs and downstream tailraces exceeding a human consumption benchmark, compared to 6-17% where stratification did not occur. These findings suggest that impoundment and stratification play important roles in determining the patterns of Hg exposure risk across the landscape.
英文关键词	anoxia bioaccumulation destratification methylmercury snake river tailrace Smallmouth Bass
类型	Article
语种	英语
开放获取类型	Green Published, hybrid
收录类别	SCI-E
WOS记录号	WOS:001127987800001
WOS关键词	WESTERN UNITED-STATES ; FRESH-WATER FISH ; METHYL MERCURY ; HYDROELECTRIC RESERVOIRS ; METHYLMERCURY PRODUCTION ; ORGANIC-CARBON ; FOOD-WEB ; IMPACTS ; DOWNSTREAM ; DAMS
WOS类目	Engineering, Environmental ; Environmental Sciences
WOS研究方向	Engineering ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/396232
推荐引用方式 GB/T 7714	Willacker, James J.,Eagles-Smith, Collin A.,Chandler, James A.,et al. Reservoir Stratification Modulates the Influence of Impoundments on Fish Mercury Concentrations along an Arid Land River System[J],2023,57(50):21313-21326.
APA	Willacker, James J.,Eagles-Smith, Collin A.,Chandler, James A.,Naymik, Jesse,Myers, Ralph,&Krabbenhoft, David P..(2023).Reservoir Stratification Modulates the Influence of Impoundments on Fish Mercury Concentrations along an Arid Land River System.ENVIRONMENTAL SCIENCE & TECHNOLOGY,57(50),21313-21326.
MLA	Willacker, James J.,et al."Reservoir Stratification Modulates the Influence of Impoundments on Fish Mercury Concentrations along an Arid Land River System".ENVIRONMENTAL SCIENCE & TECHNOLOGY 57.50(2023):21313-21326.