Factors influencing methylmercury contamination of black bass from California reservoirs
| Autor: | John Negrey, Wes Heim, Jay A Davis, Mark Stephenson, Kenneth H. Coale, A. R. Melwani |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Geologic Sediments
Chlorophyll a Food Chain 010504 meteorology & atmospheric sciences Health Toxicology and Mutagenesis chemistry.chemical_element 010501 environmental sciences Toxicology 01 natural sciences California chemistry.chemical_compound Black bass Animals Methylmercury 0105 earth and related environmental sciences Total organic carbon biology Sulfates Chlorophyll A Mercury General Medicine Methylmercury Compounds Contamination biology.organism_classification Pollution Food web Mercury (element) chemistry Environmental chemistry Environmental science Bass sense organs Surface water Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Environmental Pollution. 251:850-861 |
| ISSN: | 0269-7491 |
| DOI: | 10.1016/j.envpol.2019.05.019 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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