Do agricultural pesticides in streams influence riparian spiders?

Graf, Nadin; Battes, Karina P.; Cîmpean, Mirela; Dittrich, Pitt; Entling, Martin H.; Link, Moritz; Scharmüller, Andreas; Schreiner, Verena C.; Szöcs, Eduard; Schäfer, Ralf B.

doi:10.1016/j.scitotenv.2018.12.370

Cited by 29 publications

(19 citation statements)

References 67 publications

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“…where x L and x R is the distance to the agricultural field on the left (L) and right (R) side of the stream, respectively. For further details and rationale see [23].…”

Section: Characterisation Of Environmental Parameters and Pesticide Amentioning

confidence: 99%

“…Pesticide sampling was done using passive samplers in the streams adjacent to each sampling site with polydimethylsiloxane (PDSM) sheets and styrene-divinylbenzene (SDB) disks (for details see [23]). The in-stream toxicity of the 53 detected pesticides was assessed using the logarithmic sum of the toxic unit (referred to as sumTU, [38].…”

Section: Characterisation Of Environmental Parameters and Pesticide Amentioning

confidence: 99%

“…Such studies would improve our understanding of aquatic terrestrial linkages in general and of the direct and indirect effects and aquatic ecosystems and to detect potential cross-ecosystem effects. With respect to riparian spiders, a study by Graf et al [23] found a reduced abundance and species richness, as well as changed community composition in response to in-stream pesticide toxicity. It remained uncertain to which extent this response was a direct effect of pesticide toxicity in the terrestrial habitat and an indirect effect through altered terrestrial and aquatic prey emergence, the latter constituting a cross-ecosystem effect.…”

mentioning

confidence: 99%

“…The study was conducted in Central Romania because this region is characterised by traditional, low-intensity agriculture that persists next to areas with high-intensity agriculture [24,25], potentially allowing to capture a wider gradient of in-stream pesticide toxicity than in landscapes predominantly characterised by high-intensity agriculture, as for example in Western Europe [19]. In a previous study, we found that changes in riparian spider communities correlated with in-stream pesticide toxicity [23]. Here, we focus on the response of the diet of two riparian spiders, with different foraging strategies (a web weaver and a ground hunter), to in-stream pesticide toxicity and other stream variables, to identify potential changes in the linkage between aquatic and terrestrial food webs.…”

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confidence: 99%

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Relationship between agricultural pesticides and the diet of riparian spiders in the field

et al. 2020

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Background: Examining the effects of pesticides is difficult in regions such as Western Europe because of the relatively ubiquitous use of agrochemicals and the lack of unaffected areas. To study a wide gradient of agrochemical stress, we conducted a study in Central Romania, where traditional agriculture, which is assumed to use less agrochemicals, exists adjacent to intensive agriculture. We investigated potential effects of land use related stressors including pesticides on aquatic-terrestrial predator-prey relationships using stable isotope analysis. Therefore, we sampled spiders, as well as their aquatic and terrestrial prey along streams with a pesticide pollution gradient and determined spider and prey stable carbon and nitrogen signals. Results: Aquatic prey contributed 40.8-55.4% to the diet of the orb web weaving spider Tetragnatha sp. and 34.0-53.0% to the diet of the ground-hunting Pardosa sp. The biomass of potential aquatic prey increased along a gradient of increasing riparian habitat conditions and water quality and decreasing agriculture (e.g. arable land) in the catchment. The proportion of aquatic prey in the orb web weavers diet responded positively to the biomass of potential aquatic prey and negatively to this gradient. Increasing potential prey biomass resulted in an increasing proportion of aquatic prey for the orb web weaver. The proportion of aquatic prey in the ground hunters diet increased with instream pesticide toxicity and along a gradient of increasing pastoralism in the catchment as well as increasing riparian habitat and water quality. Conclusion: The diet of two riparian predators responded to complex gradients of catchment land use, stream and riparian habitat quality as well as to in-stream pesticide toxicity. The responses to the different environmental variables can be attributed to direct (e.g. change in spider community) and indirect (e.g. changes in aquatic prey and terrestrial prey) effects. Future manipulative field studies or experiments on aquatic-terrestrial food webs are required to examine the causality of our findings and should also consider the quality of prey organisms to foster mechanistic understanding of cross-ecosystem effects.

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“…where x L and x R is the distance to the agricultural field on the left (L) and right (R) side of the stream, respectively. For further details and rationale see [23].…”

Section: Characterisation Of Environmental Parameters and Pesticide Amentioning

confidence: 99%

Section: Characterisation Of Environmental Parameters and Pesticide Amentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Relationship between agricultural pesticides and the diet of riparian spiders in the field

et al. 2020

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“…1). However, the widespread and well-documented occurrence of adverse effects in the field when authorized pesticides are applied (e.g., [3][4][5][12][13][14][15][16][17][18]) questions these assumptions.…”

Section: Authorization Along Tiersmentioning

confidence: 99%

Future pesticide risk assessment: narrowing the gap between intention and reality

et al. 2019

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Cross‐Ecosystem Fluxes of Pesticides from Prairie Wetlands Mediated by Aquatic Insect Emergence: Implications for Terrestrial Insectivores

Kraus

Kuivila

Hladik

et al. 2021

Enviro Toxic and Chemistry

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Contaminants alter the quantity and quality of insect prey available to terrestrial insectivores. In agricultural regions, the quantity of aquatic insects emerging from freshwaters can be impacted by insecticides originating from surrounding croplands. We hypothesized that, in such regions, adult aquatic insects could also act as vectors of pesticide transfer to terrestrial food webs. To estimate insect-mediated pesticide flux from wetlands embedded in an important agricultural landscape, semipermanetly and temporarily ponded wetlands were surveyed in cropland and grassland landscapes across a natural salinity gradient in the Prairie Pothole Region of North Dakota (USA) during the bird breeding season in 2015 and 2016 (n = 14 and 15 wetlands, respectively). Current-use pesticides, including the herbicide atrazine and the insecticides bifenthrin and imidacloprid, were detected in newly emerged insects. Pesticide detections were similar in insects emerging from agricultural and grassland wetlands. Biomass of emerging aquatic insects decreased 43%, and insectmediated pesticide flux increased 50% along the observed gradient in concentrations of insecticides in emerging aquatic insects (from 3 to 577 ng total insecticide g -1 insect). Overall, adult aquatic insects were estimated to transfer between 2 and 180 µg total pesticide wetland -1 d -1 to the terrestrial ecosystem. In one of the 2 study years, biomass of emerging adult aquatic insects was also 73% lower from agricultural than grassland wetlands and was dependent on salinity. Our results suggest that accumulated insecticides reduce the availability of adult aquatic insect prey for insectivores and potentially increase insectivore exposure to insect-borne pesticides. Adult aquatic insects retain pesticides across metamorphosis and may expose insectivores living near both agricultural and grassland wetlands to dietary sources of toxic chemicals.

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Do agricultural pesticides in streams influence riparian spiders?

Cited by 29 publications

References 67 publications

Relationship between agricultural pesticides and the diet of riparian spiders in the field

Relationship between agricultural pesticides and the diet of riparian spiders in the field

Future pesticide risk assessment: narrowing the gap between intention and reality

Cross‐Ecosystem Fluxes of Pesticides from Prairie Wetlands Mediated by Aquatic Insect Emergence: Implications for Terrestrial Insectivores

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