Limited effects of pesticides on stream macroinvertebrates, biofilm nematodes, and algae in intensive agricultural landscapes in Sweden.

Bighiu MA, Höss S, Traunspurger W, Kahlert M, Goedkoop W (2020)
Water research 174: 115640.

Zeitschriftenaufsatz | E-Veröff. vor dem Druck | Englisch
 
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Autor*in
Bighiu, Maria Alexandra; Höss, SebastianUniBi; Traunspurger, WalterUniBi; Kahlert, Maria; Goedkoop, Willem
Abstract / Bemerkung
Pesticides are frequently detected in surface waters, sometimes at levels exceeding ecotoxicological guidelines. We screened for almost 100 pesticides in 32 streams from intense agricultural areas in Southern Sweden, in concert with water chemistry parameters. In addition, we investigated the communities of benthic macroinvertebrates, biofilm nematodes and algae and calculated multiple bioassessment metrics. The number of pesticides found in each stream ranged between 2 and 52, but the sum of Toxic Units (SigmaTU) for the mixtures was generally low, and exceeded the European Uniform Principles only in a single sample for algae and in 2% of the samples for Daphnia. Only nematode communities were significantly correlated with the SigmaTU, potentially due to their higher pesticide exposure in biofilms. Diatom metrics showed that most streams were impacted by eutrophication and macroinvertebrate metrics showed good status in most streams, whereas the SPEARpesticides (SPEcies At Risk) index, specifically designed to indicate pesticide effects, showed that about half of the samples were at risk. Interestingly, SPEARpesticides was not correlated to SigmaTUDaphnia, and this discrepancy suggests that redefining the boundaries for quality classes might be necessary for this index. Moreover, SPEARpesticides was positively correlated with the commonly used macroinvertebrate index ASPT, although disparate results were found for several streams. We argue that this questions the scaling of both metrics and the specificity of their responses. We discuss that the overall good/moderate status of the streams, despite the intense agriculture in the catchments, can be due to the fact that i) a sampling strategy with repeated grab samples did not capture peak pesticide concentrations, thus underestimating acute exposure, ii) pesticide run-off indeed was low, due to measures such as buffer strips, and iii) the nutrient-rich conditions and high sediment loads counteracted pesticide toxicity. We conclude that agricultural land use was the overriding stressor in the investigated streams, including strong effects of nutrients, less apparent effects of pesticides and likely impact of hydromorphological alterations (not specifically addressed in this study). Copyright © 2020 The Authors. Published by Elsevier Ltd.. All rights reserved.
Erscheinungsjahr
2020
Zeitschriftentitel
Water research
Band
174
Art.-Nr.
115640
eISSN
1879-2448
Page URI
https://pub.uni-bielefeld.de/record/2942008

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Bighiu MA, Höss S, Traunspurger W, Kahlert M, Goedkoop W. Limited effects of pesticides on stream macroinvertebrates, biofilm nematodes, and algae in intensive agricultural landscapes in Sweden. Water research. 2020;174: 115640.
Bighiu, M. A., Höss, S., Traunspurger, W., Kahlert, M., & Goedkoop, W. (2020). Limited effects of pesticides on stream macroinvertebrates, biofilm nematodes, and algae in intensive agricultural landscapes in Sweden. Water research, 174, 115640. doi:10.1016/j.watres.2020.115640
Bighiu, M. A., Höss, S., Traunspurger, W., Kahlert, M., and Goedkoop, W. (2020). Limited effects of pesticides on stream macroinvertebrates, biofilm nematodes, and algae in intensive agricultural landscapes in Sweden. Water research 174:115640.
Bighiu, M.A., et al., 2020. Limited effects of pesticides on stream macroinvertebrates, biofilm nematodes, and algae in intensive agricultural landscapes in Sweden. Water research, 174: 115640.
M.A. Bighiu, et al., “Limited effects of pesticides on stream macroinvertebrates, biofilm nematodes, and algae in intensive agricultural landscapes in Sweden.”, Water research, vol. 174, 2020, : 115640.
Bighiu, M.A., Höss, S., Traunspurger, W., Kahlert, M., Goedkoop, W.: Limited effects of pesticides on stream macroinvertebrates, biofilm nematodes, and algae in intensive agricultural landscapes in Sweden. Water research. 174, : 115640 (2020).
Bighiu, Maria Alexandra, Höss, Sebastian, Traunspurger, Walter, Kahlert, Maria, and Goedkoop, Willem. “Limited effects of pesticides on stream macroinvertebrates, biofilm nematodes, and algae in intensive agricultural landscapes in Sweden.”. Water research 174 (2020): 115640.

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