Environmental Exposures to Agrochemicals in the Sierra Nevada Mountain Range

LeNoir, James; Aston, L.; Data, Services; Fellers, Gary M.; McConnell, Laura L.; Sieber, James

doi:10.1021/bk-2000-0747.ch005

Cited by 1 publication

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“…This is in contrast to concentrations of pesticide found in the Sierra Nevada where concentrations are typically in fractions of a microgram per litre, Tables 1 and 2. [8] 0.00022, 0.00017 Sixty Lakes (3,231 m) [28] 0.000195 Tablelands (2 sites) [14] 0.012, 0.00072 Tablelands (3,322 m) [28] 0.00617 Crescent Meadows (2.042 m) [28] 0.11815 Moro Creek (823 m) [28] 0.10425 Lake Tahoe [29] 0.00018-0.0042 Diazinon Sixty Lakes [8] 0.0018 Sixty Lakes (3,231 m) [30] 0.00092 Tablelands (2 sites) [14] 0.0031, 0.0034 Tablelands (3,322 m) [30] 0.00323 Crescent Meadows (2.042 m) [30] 0.06511 Moro Creek (823 m) [30] 0.06606 Malathion Sixty Lakes (3,231 m) [30] < LOD Tablelands (3,322 m) [30] < LOD Crescent Meadows (2.042 m) [30] 0.08161 Moro Creek (823 m) [30] 0.06612…”

Section: Experimental Evidencementioning

confidence: 99%

Declining populations of mountain yellow-legged frogs: a reassessment of the evidence implicating pesticides

Marohasy¹,

Abbot²

2015

WIT Transactions on Ecology and the Environment

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The decline in populations of the Mountain Yellow-legged frogs, Rana sierrae and Rana muscosa, in the Sierra Nevada in California is consistent with a worldwide trend in frog decline that has resulted in nine species extinctions, four of these in Australia. Spray drift from pesticides applied to agricultural crops in California's Central Valley was widely reported as causing the decline, and the claim central to a successful campaign to ban the use of cholinesterase-inhibiting pesticides in California. We reassess the scientific and historical evidence implicating pesticide use in frog decline in California using Hill's Criteria of Causation and show the extent to which the claim is based on correlation, analogy and extrapolation from computer modelling. Critically, concentrations of pesticides in National Parks that have experienced severe decline in frog numbers are orders of magnitude below those shown to produce sub-lethal effects in the laboratory. Of particular concern, output from influential computer modelling work was never validated; no water samples were ever taken to ground truth the calculated pesticide levels.

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