Complex mixtures of dissolved pesticides show potential aquatic toxicity in a synoptic study of Midwestern U.S. streams

Nowell, Lisa H.; Moran, Patrick; Schmidt, Travis S.; Norman, Julia E.; Nakagaki, Naomi; Shoda, Megan E.; Mahler, Barbara J.; Metre, Peter C. Van; Stone, Wesley W.; Sandstrom, Mark W.; Hladik, Michelle L.

doi:10.1016/j.scitotenv.2017.06.156

Cited by 123 publications

(105 citation statements)

References 58 publications

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“…Atrazine concentrations spiked in early June corresponding with typical field-applications in May. Nowell et al (2018) observed similar trends in their study of a suite of pesticides in 100 streams throughout the Midwestern U.S. Corn Belt. They detected atrazine at concentrations >100 ng/L at approximately 65% of agricultural impacted sites with peak concentrations observed between May and June, corresponding to major application and runoff events (Nowell et al, 2018).…”

Section: Pesticide Concentrations and Occurrencesupporting

confidence: 58%

“…Nowell et al (2018) observed similar trends in their study of a suite of pesticides in 100 streams throughout the Midwestern U.S. Corn Belt. They detected atrazine at concentrations >100 ng/L at approximately 65% of agricultural impacted sites with peak concentrations observed between May and June, corresponding to major application and runoff events (Nowell et al, 2018). While the major source of atrazine is expected to be coming from use in the U.S., there is not a clear pattern of spatial attenuation moving downstream along the Red River from Emerson to Breezy Point, as indicated by relatively constant mass loading in the Red River (Fig.…”

Section: Pesticide Concentrations and Occurrencementioning

confidence: 52%

“…The Office of Pesticide Programs compiles acute and/or chronic benchmarks for fish, invertebrates, and vascular and nonvascular plants (USEPA Office of Pesticide Programs, 2017a). Where applicable, the chronic toxicity benchmarks were considered given that most of our exposure data represents 14-21d TWA concentrations which represent exposure durations consistent with the USEPA protocols for chronic screening-level risk assessments (Nowell et al, 2018; USEPA Office of Pesticide Programs, 2017b). These threshold values for each pesticide were compared to exposure distributions (Fig.…”

Section: Risk Associated With Pesticide Exposuresmentioning

confidence: 99%

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Inputs, source apportionment, and transboundary transport of pesticides and other polar organic contaminants along the lower Red River, Manitoba, Canada

Challis

Cuscito

Joudan

et al. 2018

Science of The Total Environment

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The Red River originates in the U.S., drains into Lake Winnipeg, and is a significant pathway for nutrients. We investigate its role as a source for pesticides, pharmaceuticals, per- and polyfluoroalkyl substances (PFASs), and microbes bearing antibiotic resistance genes (ARGs). We delineate agricultural, urban, and rural land-use for organic contaminants to determine the extent of chemical transboundary riverine fluxes, and characterize levels and trends of organic contaminants and ARGs between spring and fall 2014 and 2015. The herbicide atrazine peaked at over 500 ng/L (14-day time-weighted average) near the border, indicating that the U.S. represents the major source into Canada from the Red River. Neonicotinoid insecticides had relatively constant concentrations, suggesting more widespread agricultural use in both countries. Pesticide concentrations were greatest post-application in June and July. Mass loadings of pesticides over the sampling periods, from the river to Lake Winnipeg, ranged from approximately 800 kg of atrazine, to 120 kg of thiamethoxam and clothianidin, to 40 kg of imidacloprid. Exposure distributions for atrazine exceeded benchmark water quality guidelines for protection of aquatic life (0.2% probability of exceeding chronic benchmark) with no exceedances for neonicotinoids. Seven pharmaceuticals were detected, mostly at low ng/L levels downstream of the City of Winnipeg wastewater treatment plant. Carbamazepine, the only pharmaceutical detected consistently at all sites, contributed on average 20 kg each year into Lake Winnipeg. While minor inputs were observed all along the river, city inputs represented the greatest source of pharmaceuticals to the river. Both PFASs and ARGs were observed consistently and ubiquitously, indicative of an anthropogenically-influenced system with no indications of any single point-source signature. While transboundary flux from the U.S. was an important source of pesticides to the Red River, especially for atrazine, observed concentrations of all measured contaminants suggest that known aquatic toxicological risk is minimal.

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Section: Pesticide Concentrations and Occurrencesupporting

confidence: 58%

Section: Pesticide Concentrations and Occurrencementioning

confidence: 52%

Section: Risk Associated With Pesticide Exposuresmentioning

confidence: 99%

See 1 more Smart Citation

Inputs, source apportionment, and transboundary transport of pesticides and other polar organic contaminants along the lower Red River, Manitoba, Canada

Challis

Cuscito

Joudan

et al. 2018

Science of The Total Environment

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“…It was expected that agricultural land use would be associated with the presence of pesticides, herbicides (Elliott et al 2017;Nowell et al 2018), and livestock-specific chemicals (i.e., growth promoters, steroids, livestock pharmaceuticals; Jaffrézic et al 2017). Biological effects from agricultural CECs include feminized sex ratios (Hoskins and Boone 2017), reductions in fecundity (Jensen et al 2006), and a reduction in species abundance and total number (Schäfer et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Land Use Contributions to Adverse Biological Effects in a Complex Agricultural and Urban Watershed: A Case Study of the Maumee River

Cipoletti

Jorgenson

Banda

et al. 2019

Enviro Toxic and Chemistry

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Agricultural and urban contaminants are an environmental concern because runoff may contaminate aquatic ecosystems, resulting in stress for exposed fish. The objective of the present controlled, field‐based study was to assess the impacts of high‐intensity agriculture and urban land use on multiple life stages of the fathead minnow (Pimephales promelas), using the Maumee River (Toledo, OH, USA) as a case study. Laboratory cultured adult and larval fathead minnows were exposed for 21 d, and embryos were exposed until hatching to site‐specific water along the lower reach of the Maumee River. Adult minnows were analyzed for reproduction and alterations to hematologic characteristics (vitellogenin, glucose, estradiol, 11‐ketotestosterone). Water and fish tissue samples were analyzed for a suite of multiresidue pesticides, hormones, and pharmaceuticals. Contaminants were detected in every water and tissue sample, with 6 pesticides and 8 pharmaceuticals detected in at least 82% of water samples and at least half of tissue samples. Effects differed by exposed life stage and year of exposure. Fecundity was the most sensitive endpoint measured and was altered by water from multiple sites in both years. Physiological parameters associated with fecundity, such as plasma vitellogenin and steroid hormone concentrations, were seldom impacted. Larval fathead minnows appeared to be unaffected. Embryonic morphological development was delayed in embryos exposed to site waters collected in 2016 but not in 2017. A distinction between agricultural and urban influences in the Maumee River was not realized due to the great overlap in contaminant presence and biological effects. Differences in precipitation patterns between study years likely contributed to the observed biological differences and highlight the need for environmental exposure studies to assess the environmental risk of contaminants. Environ Toxicol Chem 2019;00:1‐17. © 2019 SETAC

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“…Conversely, development, particularly increases in impervious surface, is related to increases in the amount and variety of chemical contaminants and more erratic hydrology (Allen, 2004). The chemical signature in developed land is very different than agricultural land, with increased concentrations of contaminants such as heavy metals, polycyclic aromatic hydrocarbons, polychlorinated biphenyls (Nowell et al, 2013) and different mixtures of pesticides (Nowell et al, 2013(Nowell et al, , 2017 In this study, we acknowledge potential limitations with parasite specificity using histological methods only for parasite identification.…”

Section: Discussionmentioning

confidence: 99%

Spatial and temporal variability of myxozoan parasite, Myxobolus inornatus, prevalence in young of the year smallmouth bass in the Susquehanna River Basin, Pennsylvania

Schall

Blazer

Walsh

et al. 2018

Journal of Fish Diseases

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A myxozoan parasite, Myxobolus inornatus, is one disease agent identified in young of the year (YOY) smallmouth bass in the Susquehanna River Basin, Pennsylvania. We investigated spatial and temporal variability in M. Inornatus prevalence across the Susquehanna River Basin and at several out-of-basin sites. We examined potential land use drivers of M. Inornatus prevalence including agricultural and developed land use. In 1,267 YOY smallmouth bass collected from 32 sites during 2013-2016, M. Inornatus was documented in 43.6% of samples. Among-site variability in parasite prevalence was greater than among-year variability. The effect of agricultural land use on M. Inornatus prevalence had a high probability of being positively correlated at multiple spatial scales (probability of positive effect > 0.80). The effect of developed land use on M. Inornatus prevalence had a relatively high probability of being negatively correlated at multiple spatial scales (probability of negative effect > 0.70). Our results suggest that land use practices could be related to M. Inornatus infection of smallmouth bass. Further study will be necessary to determine whether disease dynamics are a consequence of effects on the host, alterations of instream habitat mediating invertebrate host dynamics and/or survival and dispersal of the parasite infective stage.

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Complex mixtures of dissolved pesticides show potential aquatic toxicity in a synoptic study of Midwestern U.S. streams

Cited by 123 publications

References 58 publications

Inputs, source apportionment, and transboundary transport of pesticides and other polar organic contaminants along the lower Red River, Manitoba, Canada

Inputs, source apportionment, and transboundary transport of pesticides and other polar organic contaminants along the lower Red River, Manitoba, Canada

Land Use Contributions to Adverse Biological Effects in a Complex Agricultural and Urban Watershed: A Case Study of the Maumee River

Spatial and temporal variability of myxozoan parasite, Myxobolus inornatus, prevalence in young of the year smallmouth bass in the Susquehanna River Basin, Pennsylvania

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