Influence of land use and region on glyphosate and aminomethylphosphonic acid in streams in the USA

Medalie, Laura; Baker, Nancy T.; Shoda, Megan E.; Stone, Wesley W.; Meyer, Michael T.; Stets, Edward G.; Wilson, Michaelah C.

doi:10.1016/j.scitotenv.2019.136008

Cited by 69 publications

(45 citation statements)

References 35 publications

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“…2014, Medalie et al. 2020). Globally, imidacloprid and glyphosate concentrations can range between ˜<0.01–320 µg/L and ˜<0.001–5.2 mg/L, respectively (Struger et al.…”

Section: Discussionmentioning

confidence: 99%

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Widespread agrochemicals differentially affect zooplankton biomass and community structure

Hébert

Fugère

Beisner

et al. 2021

Ecological Applications

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Anthropogenic environmental change is causing habitat deterioration at unprecedented rates in freshwater ecosystems. Despite increasing more rapidly than many other agents of global change, synthetic chemical pollution—including agrochemicals such as pesticides—has received relatively little attention in freshwater community and ecosystem ecology. Determining the combined effects of multiple agrochemicals on complex biological systems remains a major challenge, requiring a cross‐field integration of ecology and ecotoxicology. Using a large‐scale array of experimental ponds, we investigated the response of zooplankton community properties (biomass, composition, and diversity metrics) to the individual and joint presence of three globally widespread agrochemicals: the herbicide glyphosate, the neonicotinoid insecticide imidacloprid, and nutrient fertilizers. We tracked temporal variation in zooplankton biomass and community structure along single and combined pesticide gradients (each spanning eight levels), under low (mesotrophic) and high (eutrophic) nutrient‐enriched conditions, and quantified (1) response threshold concentrations, (2) agrochemical interactions, and (3) community resistance and recovery. We found that the biomass of major zooplankton groups differed in their sensitivity to pesticides: ≥0.3 mg/L glyphosate elicited long‐lasting declines in rotifer communities, both pesticides impaired copepods (≥3 µg/L imidacloprid and ≥5.5 mg/L glyphosate), whereas some cladocerans were highly tolerant to pesticide contamination. Strong interactive effects of pesticides were only recorded in ponds treated with the combination of the highest doses. Overall, glyphosate was the most influential driver of aggregate community properties of zooplankton, with biomass and community structure responding rapidly but recovering unequally over time. Total community biomass showed little resistance when first exposed to glyphosate, but rapidly recovered and even increased with glyphosate concentration over time; in contrast, taxon richness decreased in more contaminated ponds but failed to recover. Our results indicate that the biomass of tolerant taxa compensated for the loss of sensitive species after the first exposure, conferring greater community resistance upon a subsequent contamination event; a case of pollution‐induced community tolerance in freshwater animals. These findings suggest that zooplankton biomass may be more resilient to agrochemical pollution than community structure; yet all community properties measured in this study were affected at glyphosate concentrations below common water quality guidelines in North America.

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“…2014, Medalie et al. 2020). Globally, imidacloprid and glyphosate concentrations can range between ˜<0.01–320 µg/L and ˜<0.001–5.2 mg/L, respectively (Struger et al.…”

Section: Discussionmentioning

confidence: 99%

“…2019, Medalie et al. 2020), leading to their widespread occurrence (Aparicio et al. 2013, Morrissey et al.…”

Section: Introductionmentioning

confidence: 99%

Widespread agrochemicals differentially affect zooplankton biomass and community structure

Hébert

Fugère

Beisner

et al. 2021

Ecological Applications

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“…In this experiment, concentrations at which pesticides caused biotic effects differed among zooplankton community properties, with most response thresholds falling within the range of previously recorded levels in agricultural water bodies. Though pervasive in surface waters, imidacloprid and glyphosate concentrations are highly variable, in part owing to variability in land use intensity and biodegradation potential (Giroux, 2019;Hladik et al, 2014;Medalie et al, 2020). Globally, imidacloprid and glyphosate concentrations can range between <0.01-320 µg/L and <0.001-5.2 mg/L, respectively (Annett et al, 2014;Hénault-Éthier et al, 2017;Morrissey et al, 2015;Struger et al, 2008;; but levels on the order of ng/L are common for both pesticides (Montiel-Léon et al, 2019).…”

Section: Implications and Concluding Remarksmentioning

confidence: 99%

“…In this study, we address how complex zooplankton communities respond to the individual and cumulative effects of fertilisers (nutrient pollution) and two widely used, globally relevant pesticides: the herbicide glyphosate and the neonicotinoid insecticide imidacloprid. Glyphosate-and imidacloprid-based pesticides are extensively used in agricultural landscapes (Maggi et al, 2020;Simon-Delso et al, 2015) and can reach aquatic ecosystems in different ways (Hébert et al, 2019;Jeschke et al, 2011;Medalie et al, 2020;Struger et al, 2017), leading to their widespread occurrence in freshwaters (Aparicio et al, 2013;Montiel-Léon et al, 2019;Morrissey et al, 2015) and concerns over their toxicity to aquatic life (Anderson et al, 2015;van Bruggen et al, 2018). Zooplankton have been extensively used as model organisms in toxicological assessments on non-target aquatic biota.…”

Section: Introductionmentioning

confidence: 99%

Widespread agrochemicals differentially affect zooplankton biomass and community structure

Hébert

Fugère

Beisner

et al. 2020

Preprint

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Anthropogenic environmental change is causing habitat deterioration at unprecedented rates in freshwater ecosystems. Despite increasing more rapidly than other agents of global change, synthetic chemical pollution –including agrochemicals such as pesticides– has received relatively little attention in freshwater biotic assessments. Determining the effects of multiple agrochemicals on complex community and ecosystem properties remains a major challenge, requiring a cross-field integration of ecology and ecotoxicology. Using a large-scale array of experimental ponds, we investigated the response of zooplankton community properties (biomass, composition, diversity metrics) to the individual and joint presence of three widespread agrochemicals: the herbicide glyphosate, the neonicotinoid insecticide imidacloprid, and fertilisers. We tracked temporal variation in community biomass and structure (i.e., composition, diversity metrics) along single and combined pesticide gradients (each spanning eight levels), under low (mesotrophic) and high (eutrophic) nutrient-enriched conditions, and quantified (i) agrochemical interactions, (ii) response threshold concentrations, and (iii) community resistance and recovery. We found that major zooplankton groups differed in their sensitivity to pesticides: ≥3 µg/L imidacloprid impaired copepods, rotifers collapsed at glyphosate levels ≥0.3 mg/L, whereas some cladocerans were highly tolerant to pesticide contamination. Glyphosate was the most influential driver of community properties, with biomass and community structure responding rapidly but recovering unequally over time. Zooplankton biomass showed little resistance when first exposed to glyphosate, but rapidly recovered and even increased with glyphosate concentration; in contrast, richness declined in more contaminated ponds but failed to recover. Our results show that the biomass of tolerant taxa compensated for the loss of sensitive species, conferring greater resistance upon subsequent exposure; a rare example of pollution-induced community tolerance in freshwater metazoans. Overall, zooplankton biomass appears to be more resilient to agrochemical pollution than community structure, yet all community properties measured in this study were affected at glyphosate levels below common water quality guidelines in North America.

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“…further research is warranted on potential increased synergistic risks posed by glyphosate combined with other chemicals at the low part per billion levels commonly detected in streams. the usgs has been conducting periodic monitoring of glyphosate and aMpa in a network of over 70 streams across the contiguous united states since the early 2000s [6,23]. the detection limit achieved by the usgs laboratory since 2009 is 20 ng/l as compared to the 75 ng/l detection limit associated with the immunoassay analysis used during this study.…”

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confidence: 99%

Occurrence and Persistence of the Herbicide Glyphosate in a suburban tropical watershed

Spengler¹,

Heskett²,

Spengler³

2021

Int. J. EI

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Occurrence and persistence Of the herbicide glyphOsate in a suburban trOpical watershed steVen r. spengler 1 , MarVin d. hesKett 1 , saMuel c. spengler 2 1 element environmental, 2 united states forest service abstract stream, streambed sediment and suspended sediment sampling for the herbicide glyphosate was conducted in a small, 4.05-square kilometer suburban watershed on the island of Oahu, hawaii between december 2017 and april 2020. Over this 2.5-year study period, a total of 188 stream samples (142 runoff conditions, 46 baseflow conditions), 81 streambed sediment samples, and 9 suspended sediment samples were collected and analysed for glyphosate and a subset of sediment samples were analysed for its degradation product aminomethylphosphonic acid (aMpa).the glyphosate concentration levels measured during stormwater runoff conditions within Kawa stream were significantly higher than levels measured under groundwater dominant baseflow conditions. the mean and median glyphosate concentrations (µg/l) and the frequency of glyphosate detection (reporting limit 0.075 µg/l) measured in Kawa stream under runoff and baseflow conditions were 0.98/0.51/92% and 0.10/0.035/28%, respectively. the glyphosate concentrations measured in this small suburban tropical stream were significantly higher than mean levels measured by the usgs between 2014 and 2020 in streams that drain small urban watersheds throughout the continental united states. the glyphosate concentration levels measured in riverbed and suspended sediments in Kawa stream were generally two to three orders of magnitude higher than levels measured in stream-water.the majority of glyphosate (>90%) was transported to Kaneohe bay in the dissolved phase and originated from residential areas within the contributory watershed. the mean mass flux of glyphosate measured entering the near coastal environment under baseflow conditions was around 0.16 mg/min, while the mean mass flux during runoff conditions was 106 mg/min. the estimated median half-lives of glyphosate and aMpa measured in streambed sediments during this study were 4.7 and 6.2 days, respectively. this short half-life (4.7 days) along with the high-frequency (92%) of glyphosate detection in hawaiian streams under runoff conditions illustrates the steady, unceasing input of glyphosate to hawaiian streams.

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Influence of land use and region on glyphosate and aminomethylphosphonic acid in streams in the USA

Cited by 69 publications

References 35 publications

Widespread agrochemicals differentially affect zooplankton biomass and community structure

Widespread agrochemicals differentially affect zooplankton biomass and community structure

Widespread agrochemicals differentially affect zooplankton biomass and community structure

Occurrence and Persistence of the Herbicide Glyphosate in a suburban tropical watershed

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