Mercury concentrations in water and mercury and selenium concentrations in fish from Brownlee Reservoir and selected sites in the Boise and Snake Rivers, Idaho and Oregon, 2013-17

MacCoy, Dorene E.; Mebane, Christopher A.

doi:10.3133/ofr20181122

Cited by 1 publication

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“…Fish-tissue data from the complex show that hypolimnetic MeHg is entering the food web: 31% of smallmouth bass collected in 2013 within the HCC and up to 60 miles downstream exceeded the State of Idaho human health fish-tissue criterion for mercury (0.3 mg/kilogram wet weight), compared to 0% of smallmouth bass collected ∼177 km upstream of the HCC in the same year . There is interest in understanding bioaccumulation within the reservoirs and the potential downstream export of MeHg to the lower Snake and Columbia Rivers.…”

Section: Methodsmentioning

confidence: 99%

Seasonal Dynamics and Interannual Variability in Mercury Concentrations and Loads through a Three-Reservoir Complex

Baldwin

Poulin

Naymik³

et al. 2020

Environ. Sci. Technol.

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The Hells Canyon Complex (HCC) along the Snake River (Idaho–Oregon border, U.S.A.) encompasses three successive reservoirs that seasonally stratify, creating anoxic conditions in the hypolimnion that promote methylmercury (MeHg) production. This study quantified seasonal dynamics and interannual variability in mercury concentrations (inorganic divalent mercury (IHg) and MeHg) and loads at four reservoir inflow and outflow locations through the HCC (2014–2017). We observed (1) that the HCC is a net sink for both IHg and MeHg, (2) interannual variability in IHg and MeHg loads largely reflecting streamflow conditions, and (3) seasonal variability in particulate IHg loading at the inflow (greatest from February to April) and MeHg export from the outflow (greatest from September to December) of the HCC. Seasonal export of MeHg was evidenced by increases in monthly mean concentrations of unfiltered MeHg (approximately 2-fold) and the percentage of total mercury (THg) as MeHg (≥4-fold) coincident with reservoir destratification. Despite evidence of seasonal export of MeHg from the HCC, annual loads indicate a 42% decrease in unfiltered MeHg from HCC inflow to outflow. Results from this study improve the understanding of seasonal variability in mercury transport through and transformation within a reservoir complex.

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Section: Methodsmentioning

confidence: 99%

Seasonal Dynamics and Interannual Variability in Mercury Concentrations and Loads through a Three-Reservoir Complex

Baldwin

Poulin

Naymik³

et al. 2020

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

Mercury concentrations in water and mercury and selenium concentrations in fish from Brownlee Reservoir and selected sites in the Boise and Snake Rivers, Idaho and Oregon, 2013-17

Abstract: Mercury (Hg) analyses were conducted on samples of water and sport fish collected from selected sampling sites in the Boise and Snake Rivers and Brownlee Reservoir, in Idaho and Oregon, to meet National Pollution Discharge and Elimination System (NPDES) permit requirements for the

Cited by 1 publication

References 4 publications

Seasonal Dynamics and Interannual Variability in Mercury Concentrations and Loads through a Three-Reservoir Complex

Seasonal Dynamics and Interannual Variability in Mercury Concentrations and Loads through a Three-Reservoir Complex

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