| spatiotemporal trends in fish mercury from a mine-dominated ecosystem: clear lake, california. | clear lake, california, usa, receives acid mine drainage and mercury (hg) from the sulphur bank mercury mine, a u.s. environmental protection agency (u.s. epa) superfund site that was active intermittently from 1873 to 1957 and partially remediated in 1992. mercury concentrations were analyzed primarily in four species of clear lake fishes: inland silversides (menidia beryllina, planktivore), common carp (cyprinus carpio, benthic scavenger/omnivore), channel catfish (ictalurus punctatus, benthic ... | 2008 | 19475924 |
| trace element residues in bluegills and common carp from the lower san joaquin river, california, and its tributaries. | whole-body samples of bluegills (lepomis macrochirus) and common carp (cyprinus carpio) from the san joaquin river and two tributaries (merced river and salt slough) were analyzed to determine if the concentrations of any of nine elements were elevated as a result of exposure of the fish to agricultural subsurface (tile) drainage water. highest concentrations (micrograms/g dry weight) detected were as follows (first number in each pair applies to bluegills and the second to carp): arsenic (as), ... | 1988 | 3222692 |
| chemical contaminants, health indicators, and reproductive biomarker responses in fish from the colorado river and its tributaries. | common carp (cyprinus carpio), black bass (micropterus spp.), and channel catfish (ictalurus punctatus) were collected from 14 sites in the colorado river basin (crb) to document spatial trends in accumulative contaminants, health indicators, and reproductive biomarkers. organochlorine residues, 2,3,7,8-tetrachlorodibenzo-p-dioxin-like activity (tcdd-eq), and elemental contaminants were measured in composite samples of whole fish, grouped by species and gender, from each site. selenium (se) and ... | 2007 | 17418376 |
| selenium biotransformations into proteinaceous forms by foodweb organisms of selenium-laden drainage waters in california. | selenium contamination represents one of the few clear cases where environmental pollution has led to devastation of wildlife populations, most notably in agricultural drainage evaporation and power plant coal-fly ash receiving ponds. complex biogeochemistry, in particular extensive biotransformations and foodchain transfer, governs se ecotoxicology and toxicology, for which the mechanism(s) are still elusive. however, total waterborne se concentration has been widely used as a criterion for reg ... | 2002 | 11879939 |
| the impact of rice pesticides on the aquatic ecosystems of the sacramento river and delta (california). | since the early 1980s, when molinate was demonstrated to have killed carp in agricultural drains, an intensive research effort has been undertaken to assess the impact of rice pesticides on aquatic ecosystems in the sacramento river and delta. no impact has been found that can be clearly attributed to rice pesticides. however, the rice insecticides methyl parathion and carbofuran, and probably also bufencarb, reached levels in the river and delta that, based on laboratory bioassays, would have b ... | 1999 | 9921140 |