California Environmental Protection Agency, Department of Pesticide Regulation, Environmental Monitoring and Pesticide Management Branch, 1020 N Street, Sacramento, California 95814, USA Departments of Entomology and Environmental Toxicology, University of California, Davis, California 95616, USA Center for Analytical Chemistry, California Department of Food and Agriculture, 3292 Meadowview Roa...

Matthew Tan, Hiromi I. Wettersten, Kristy Chu, David L. Huso, Terry Watnick, Sharon Friedlander, Yosef Landesman, and Robert H. Weiss Graduate Group in Comparative Pathology, Division of Nephrology, Department of Internal Medicine, and Cancer Center, University of California, Davis, California; Department of Molecular and Comparative Pathobiology, Johns Hopkins University School of Medicine, Ba...

In 2005, an outbreak of West Nile virus (WNV) disease occurred in Sacramento County, California; 163 human cases were reported. In response to WNV surveillance indicating increased WNV activity, the Sacramento-Yolo Mosquito and Vector Control District conducted an emergency aerial spray. We determined the economic impact of the outbreak, including the vector control event and the medical cost t...

— Motivated by a particular interest in the distribution of the nonindigenous, piscivorous Sacramento pikeminnow Ptychocheilus grandis, we examined fish–habitat relationships in small tributaries (draining 20–200 km2) in the Eel River drainage of northwestern California. We sampled juvenile and adult fish in 15 tributaries in both the summer and fall of 1995 and attempted to relate the densitie...

Methylmercury (MeHg) is a bioaccumulative pollutant produced in and exported from flooded soils, including those used for rice ( L.) production. Using unfiltered aqueous MeHg data from MeHg monitoring programs in the Sacramento River watershed from 1996 to 2007, we assessed the MeHg contribution from rice systems to the Sacramento River. Using a mixed-effects regression analysis, we compared Me...