Pesticides Are Involved With Population Declines of Amphibians in the California Sierra Nevadas by Donald W. Sparling, Gary Fellers, Laura McConnell

“…Another probable cause is air-borne pesticides from the Central Valley of California. The Central Valley, especially the San Joaquin Valley, is a major agricultural region where millions of pounds of active ingredient pesticides are applied each year (http://www.cdpr.ca.gov/dprdatabase.htm). …”
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