Temporal and spatial variation of atmospherically deposited organic contaminants at high elevation in yosemite national park, California, USA

Bradford, David F.; Stanley, Kerri; Tallent, Nita G.; Sparling, Donald W.; Nash, Maliha S.; Knapp, Roland A.; McConnell, Laura L.; Simonich, Staci L. Massey

doi:10.1002/etc.2094

Cited by 18 publications

(8 citation statements)

References 30 publications

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“…Other studies of pesticide distribution have supported the negative correlation between elevation and pesticide concentrations (Mast et al, 2012). There are exceptions that have been found such as McGee Lake in the McGee Creek drainage (Bradford et al, 2013). Although this lake is still considered high elevation (2470 m), other topographical factors should be taken into consideration to understand why this lake is notably different.…”

Section: Discussionmentioning

confidence: 94%

Deposition patterns and transport mechanisms for the endocrine disruptor 4-nonylphenol across the Sierra Nevada Mountains, California

Lyons¹,

Bittner²,

Morgan-Jones³

2014

Environmental Pollution

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Section: Discussionmentioning

confidence: 94%

Deposition patterns and transport mechanisms for the endocrine disruptor 4-nonylphenol across the Sierra Nevada Mountains, California

Lyons¹,

Bittner²,

Morgan-Jones³

2014

Environmental Pollution

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“…There is also loss of mass of CPY by transport from air to the ground, specifically due to deposition in rain or snow, sorption to aerosol particles that subsequently are deposited by wet and dry deposition, and direct sorption to terrestrial and aquatic surfaces as shown by Aston and Seiber (1997), LeNoir et al (1999) and Bradford et al (2013). Estimates of these process rates can be made and the overall results can be compared to measured concentrations of CPY.…”

Section: Model Of Long Range Transport and Characteristic Travel Distmentioning

confidence: 99%

Fate in the Environment and Long-Range Atmospheric Transport of the Organophosphorus Insecticide, Chlorpyrifos and Its Oxon

Mackay

Giesy

Solomon

2014

Reviews of Environmental Contamination and Toxicology

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“…Airborne contaminants (including pesticides) originating in California's agricultural Central Valley are transported downwind to the Sierra Nevada (24,25) and may also have impacts on amphibians (26,27). However, an explicit link between pesticides and R. sierrae declines is lacking.…”

mentioning

confidence: 99%

Large-scale recovery of an endangered amphibian despite ongoing exposure to multiple stressors

Knapp¹,

Fellers

Kleeman

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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132

128

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Amphibians are one of the most threatened animal groups, with 32% of species at risk for extinction. Given this imperiled status, is the disappearance of a large fraction of the Earth's amphibians inevitable, or are some declining species more resilient than is generally assumed? We address this question in a species that is emblematic of many declining amphibians, the endangered Sierra Nevada yellowlegged frog (Rana sierrae). Based on >7,000 frog surveys conducted across Yosemite National Park over a 20-y period, we show that, after decades of decline and despite ongoing exposure to multiple stressors, including introduced fish, the recently emerged disease chytridiomycosis, and pesticides, R. sierrae abundance increased sevenfold during the study and at a rate of 11% per year. These increases occurred in hundreds of populations throughout Yosemite, providing a rare example of amphibian recovery at an ecologically relevant spatial scale. Results from a laboratory experiment indicate that these increases may be in part because of reduced frog susceptibility to chytridiomycosis. The disappearance of nonnative fish from numerous water bodies after cessation of stocking also contributed to the recovery. The large-scale increases in R. sierrae abundance that we document suggest that, when habitats are relatively intact and stressors are reduced in their importance by active management or species' adaptive responses, declines of some amphibians may be partially reversible, at least at a regional scale. Other studies conducted over similarly large temporal and spatial scales are critically needed to provide insight and generality about the reversibility of amphibian declines at a global scale.amphibians | recovery | disease | Rana sierrae | Yosemite

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Temporal and spatial variation of atmospherically deposited organic contaminants at high elevation in yosemite national park, California, USA

Abstract: Abstract-Contaminants used at low elevation,

Cited by 18 publications

References 30 publications

Deposition patterns and transport mechanisms for the endocrine disruptor 4-nonylphenol across the Sierra Nevada Mountains, California

Deposition patterns and transport mechanisms for the endocrine disruptor 4-nonylphenol across the Sierra Nevada Mountains, California

Fate in the Environment and Long-Range Atmospheric Transport of the Organophosphorus Insecticide, Chlorpyrifos and Its Oxon

Large-scale recovery of an endangered amphibian despite ongoing exposure to multiple stressors

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