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Methylmercury in lake bed soils during re-flooding of an Appalachian reservoir in the northeastern USA

Eklöf, Karin and Drohan, Patrick and Needoba, Joseph and Landefeld, Sally and Peterson, Tawnya D. and Hu, Haiyan and Iavorivska, Lidiia and Boyer, Elizabeth W. (2021). Methylmercury in lake bed soils during re-flooding of an Appalachian reservoir in the northeastern USA. Environmental research communications. 3 , 085004
[Research article]

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Abstract

Mercury methylation, where inorganic mercury (Hg) is converted to methylmercury (MeHg), can increase in soils when flooded. While effects of the initial flooding of soils on MeHg production have been well studied, less is known about impacts of re-flooding on MeHg production. Lake Perez, an impounded recreational reservoir in the Appalachian Highlands, was completely drained then re-filled 7 years later. We use a combination of chemical, soil physical, and microbial data to quantify changes in MeHg before and after re-flooding of the lakebed. Portions that were transiently saturated due to pluvial flooding had the highest pre-flooded MeHg concentrations. When the lake was re-flooded, concentrations of MeHg in subaqueous soils increased by a factor of 2.74 (+174%) on average. Substantial variability was observed among the sampling sites, with smaller increases in MeHg at sites subjected to seasonal flooding during periods when the reservoir was drained. The increase of soil MeHg after re-flooding was lower in this study compared to studies that evaluated soil MeHg after initial flooding, indicating that re-flooding of a former lake bed caused a smaller response in MeHg production compared to initial flooding of terrestrial land. This study advances understanding of the environmental impact of impounded reservoirs.

Authors/Creators:Eklöf, Karin and Drohan, Patrick and Needoba, Joseph and Landefeld, Sally and Peterson, Tawnya D. and Hu, Haiyan and Iavorivska, Lidiia and Boyer, Elizabeth W.
Title:Methylmercury in lake bed soils during re-flooding of an Appalachian reservoir in the northeastern USA
Series Name/Journal:Environmental research communications
Year of publishing :2021
Volume:3
Article number:085004
Number of Pages:12
Publisher:IOP PUBLISHING LTD
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
Keywords:mercury, methylmercury, reservoir, impoundment, soils, flooding
URN:NBN:urn:nbn:se:slu:epsilon-p-113523
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-113523
Additional ID:
Type of IDID
DOI10.1088/2515-7620/ac1d83
Web of Science (WoS)000691051700001
ID Code:25308
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:13 Sep 2021 04:25
Metadata Last Modified:13 Sep 2021 05:01

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