| pesticide distributions and population declines of california, usa, alpine frogs, rana muscosa and rana sierrae. | atmospherically deposited pesticides from the intensively cultivated central valley of california, usa, have been implicated as a cause for population declines of several amphibian species, with the strongest evidence for the frogs rana muscosa and rana sierrae at high elevation in the sierra nevada mountains. previous studies on these species have relied on correlations between frog population status and either a metric for amount of upwind pesticide use or limited measurements of pesticide con ... | 2011 | 21298712 |