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  • Abstract

    Understanding how mercury (Hg) accumulates in the aquatic food web requires information on the factors driving methylmercury (MeHg) contamination. This paper employs data on MeHg in muscle tissue of three black bass species (Largemouth Bass, Spotted Bass, and Smallmouth Bass) sampled from 21 reservoirs in California. During a two-year period, reservoirs were sampled for total Hg in sediment, total Hg and MeHg in water, chlorophyll a, organic carbon, sulfate, dissolved oxygen, pH, conductivity, and temperature. These data, combined with land-use statistics and reservoir morphometry, were used to investigate relationships to size-normalized black bass MeHg concentrations. Significant correlations to black bass MeHg were observed for total Hg in sediment, total Hg and MeHg in surface water, and forested area. A multivariate statistical model predicted Largemouth Bass MeHg as a function of total Hg in sediment, MeHg in surface water, specific conductivity, total Hg in soils, and forested area. Comparison to historical reservoir sediment data suggested there has been no significant decline in sediment total Hg at five northern California reservoirs during the past 20 years. Overall, total Hg in sediment was indicated as the most influential factor associated with black bass MeHg contamination. The results of this study improve understanding of how MeHg varies in California reservoirs and the factors that correlate with fish MeHg contamination.

    Applied Marine Sciences, Inc.

    May 30, 2019
    Biological Studies, Data/Geospatial Analyses, Methylmercury
  • Applied Marine Sciences, Inc.

    May 30, 2019
    Ammonia Toxicity, Ammonium, Nitrogen Biochemistry, Nutrients, Phytoplankton, Primary Production
  • Applied Marine Sciences, Inc.

    November 1, 2018
    Sampling Design, Statistical Analysis, Stormwater Management, TMDL Support
  • Applied Marine Sciences, Inc.

    February 12, 2018
    Fisheries Assessments, Hard-bottom Subtidal, ROV Survey
  • Applied Marine Sciences, Inc.

    January 15, 2018
    Eutrophication and Algal Bloom Assessments, Primary Production
  • Applied Marine Sciences, Inc.

    January 15, 2018
    Fiber Optic Cables, Hard-bottom Subtidal, ROV Survey
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