| prediction of fish and sediment mercury in streams using landscape variables and historical mining. | widespread mercury (hg) contamination of aquatic systems in the sierra nevada of california, u.s., is associated with historical use to enhance gold (au) recovery by amalgamation. in areas affected by historical au mining operations, including the western slope of the sierra nevada and downstream areas in northern california, such as san francisco bay and the sacramento river-san joaquin river delta, microbial conversion of hg to methylmercury (mehg) leads to bioaccumulation of mehg in food webs ... | 2016 | 27378154 |
| genetic variation among interconnected populations of catostomus occidentalis: implications for distinguishing impacts of contaminants from biogeographical structuring. | exposure to contaminants can affect survivorship, recruitment, reproductive success, mutation rates and migration, and may play a significant role in the partitioning of genetic variation among exposed and nonexposed populations. however, the application of molecular population genetic data to evaluate such influences has been uncommon and often flawed. we tested whether patterns of genetic variation among native fish populations (sacramento sucker, catostomus occidentalis) in the central valley ... | 2003 | 12969484 |
| cholinesterases in aquatic biomonitoring: assay optimization and species-specific characterization for a california native fish. | cholinesterase (che) enzyme activity measurements are widely applied in aquatic organisms for water quality monitoring, especially for pesticide contamination in agricultural watersheds. these biomarkers are amenable to measurement in a variety of species, and are therefore useful for examining effects in model organisms relevant to the ecosystem of interest. however, extensive variation in che biochemistry exists among tissues and species. this variation is rarely characterized and may lead to ... | 2005 | 16215695 |