Adaptation, not acclimation, is the likely mechanism for reduced sensitivity of some wild <i>Hyalella</i> populations to pyrethroid insecticides

Weston, Donald P.; Poynton, Helen C.; Lydy, Michael J.; Wellborn, Gary A.

doi:10.1002/etc.3174

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…Toxicity testing has several additional benefits compared to monitoring individual chemicals: 1) it addresses effects of new chemicals that are not on standard monitoring lists like the Clean Water Act list of priority pollutants (40 CFR Part 423, Appendix A); 2) it allows monitoring programs to look for effects of chemicals for which there are no commercially available chemical analysis methods; and 3) it integrates the effects of all chemicals in the water. Despite a 1999 USEPA review that found that a preponderance of evidence showed that toxicity test results are reliable qualitative predictors of aquatic ecosystem community impacts (de Vlaming and Norberg‐King 1999), some have questioned the appropriateness of using laboratory tests with indicator organisms to evaluate attainment of water quality standards based on examples that may overestimate (e.g., Hall et al 2009; Clark et al 2015a, 2015b; Weston et al 2015) or underestimate (Morrissey et al 2015) ambient aquatic toxicity. Only a few current‐use pesticides are on the Clean Water Act Priority Pollutant list (40 CFR Part 423, Appendix A), and commercial laboratories rarely offer services measuring most of the >1000 registered current‐use pesticides.…”

Section: Aquatic Toxicity Monitoring Revealed Challenges For Pesticide and Water Quality Regulatorsmentioning

confidence: 99%

Water Quality Impairments Due to Aquatic Life Pesticide Toxicity: Prevention and Mitigation in California, USA

Moran¹,

Anderson

Phillips

et al. 2020

Enviro Toxic and Chemistry

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The management of pesticides to protect water quality remains a significant global challenge. Historically, despite regulatory frameworks intended to prevent, minimize, and manage off‐site movement of pesticides, multiple generations of pesticide active ingredients have created a seemingly unending cycle of pesticide water pollution in both agricultural and urban watersheds. In California, the most populous and most agricultural US state, pesticide and water quality regulators realized in the 1990s that working independently of each other was not an effective approach to address pesticide water pollution. Over the years, these California agencies have developed a joint vision and have continued to develop a unified approach that has the potential to minimize pesticide risks to aquatic life through a combination of prevention, monitoring, and management actions, while maintaining pesticide availability for effective pest control. Key elements of the current California pesticide/water quality effort include: 1) pesticide and toxicity monitoring, coupled with watershed modeling, to maximize information obtained from monitoring; 2) predictive fate and exposure modeling to identify potential risks to aquatic life for new pesticide products when used as allowed by the label or to identify effective mitigation measures; and 3) management approaches tailored to the different pesticide uses, discharge sources, physical environments, and regulatory environments that exist for agricultural runoff, urban runoff, and municipal wastewater. Lessons from this effort may inform pesticide management elsewhere in the world as well as other chemical regulatory programs, such as the recently reformed US Toxic Substances Control Act and California's Safer Consumer Products regulatory program. Environ Toxicol Chem 2020;39:953–966. © 2020 SETAC

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Section: Aquatic Toxicity Monitoring Revealed Challenges For Pesticide and Water Quality Regulatorsmentioning

confidence: 99%

Water Quality Impairments Due to Aquatic Life Pesticide Toxicity: Prevention and Mitigation in California, USA

Moran¹,

Anderson

Phillips

et al. 2020

Enviro Toxic and Chemistry

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“…It is native Hyalella from environments in which long-term releases of pyrethroids have exerted a selective pressure for a resistant genotype (i.e., they have been inadvertently selectively bred). Multiple studies have shown that in areas with little or no pyrethroid use, the native Hyalella have a pyrethroid sensitivity comparable to the laboratory-reared populations (Weston et al 2013;Clark et al 2015;Weston et al 2015;Major et al 2018). Furthermore, this argument only serves to reward environmentally irresponsible behavior by essentially claiming that if, through chronic exposure, a discharger can eliminate wild-type individuals and foster the spread of mutations conferring resistance, then the pesticide tolerance of the resistant population should guide derivation of water quality objectives.…”

Section: Regulatory Implications Of Pesticide Resistancementioning

confidence: 99%

Chemical and Toxicological Impacts to Cache Slough Following Storm-Driven Contaminant Inputs

Weston

Moschet

Young

et al. 2019

SFEWS

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Chemical and toxicological testing in the Cache Slough complex (the slough) of the North Delta indicated the aquatic biota are exposed to a variety of wastewater-derived food additives, pharmaceuticals, and personal care products in highest concentration during dry periods, and many insecticides, herbicides and fungicides with peak concentrations after winter rains. The insecticide groups currently known to be of greatest toxicological concern are the pyrethroids and the fiproles (i.e., fipronil and its degradation products). After stormwater runoff enters the system via Ulatis Creek, both pesticide groups attained concentrations that posed a threat to aquatic life. When the commonly used testing species, Hyalella azteca, was placed in Cache Slough, toxicity-and, at times, near total mortality-was seen over at least an 8-km reach of Cache Slough that extended from the uppermost end almost to the junction with the Deep Water Ship Channel. Previous work over many years has shown similar results after other winter storms. However, when H. azteca that carried a mutation providing resistance to pyrethroid pesticides were also deployed in the slough, no ill effects were observed, which provided strong evidence that pyrethroids were responsible for toxicity to the non-resistant strain. Abundant resident H. azteca in Cache Slough carry any of four mutations that provide resistance to pyrethroids. They also carry a mutation that provides resistance to organophosphate pesticides, and likely carbamate pesticides as well. After many years of exposure, sensitive genotypes have been nearly eliminated from the system, and replaced by a population unaffected by many insecticides now in common use. We offer a variety of reasons why this shift to a population with mutant genotypes RESEARCH

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Clark

Scott

Hall

et al. 2015

Enviro Toxic and Chemistry

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Adaptation, not acclimation, is the likely mechanism for reduced sensitivity of some wild Hyalella populations to pyrethroid insecticides

Cited by 4 publications

References 13 publications

Water Quality Impairments Due to Aquatic Life Pesticide Toxicity: Prevention and Mitigation in California, USA

Water Quality Impairments Due to Aquatic Life Pesticide Toxicity: Prevention and Mitigation in California, USA

Chemical and Toxicological Impacts to Cache Slough Following Storm-Driven Contaminant Inputs

The authors’ reply

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