Ecological risk assessment of atrazine in North American surface waters.

KEITH R. SOLOMON,*y JOHN P. GIESY,z THOMAS W. LAPOINT,§ JEFFREY M. GIDDINGS,k and R. PETER RICHARDS# yCentre for Toxicology, School of Environmental Sciences, University of Guelph, Ontario, Canada zDepartment of Veterinary Biomedical Sciences and Toxicology Centre, University of Saskatchewan, Saskatoon, Saskatchewan, Canada §Department of Biological Sciences, University of North Texas, Denton, Texas, USA kCompliance Services International, Rochester, Massachusetts, USA #National Center for Water Quality Research, Heidelberg University, Tiffin, Ohio, USA