Population Studies, Toxicology, General biology symposia, transactions and proceeding, Ecology, Environmental biology, Animals, Public health, water and soil pollution, Pest control, Pesticides and herbicides, Vertebrata, Chordata, Animalia, Amphibians, Animals, Chordates, Nonhuman Vertebrates, Vertebrates, Amphibia, Vertebrata, Salientia, Bufo canorus, Yosemite toad, Rana aurora draytonii, California red-legged frog, Rana boylii, Foothill yellow-legged frog, Rana cascadae, Cascades frog, Rana muscosa, Mountain yellow-legged frog, Cholinesterase-inhibiting compounds, Upwind use, Pollutant, Toxin, California, USA, North America, Nearctic region, Generalized additive models, Mathematical and computer techniques, MI Department of Pesticide Regulation, Agricultural land use, Elevation, Historical pesticide use, Population declines, Population status, Precipitation, Spatial location, Urban land use