Please use this identifier to cite or link to this item: doi:10.22028/D291-31298
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Title: Pesticides in agricultural headwater streams in southwestern Germany and effects on macroinvertebrate populations
Author(s): Weber, Gero
Christmann, Nicole
Thiery, Ann-Cathrin
Martens, Dieter
Kubiniok, Jochen
Language: English
Title: The science of the total environment : an international journal for scientific research into the environment and its relationship with man
Volume: 619-620
Startpage: 638
Endpage: 648
Publisher/Platform: Elsevier
Year of Publication: 2018
Publikation type: Journal Article
Abstract: Pesticides are a major burden for stream ecosystems in the central European cultivated landscape. The objective of the present study was to investigate the applicability of ecological indicator methods in relation to toxicity of pesticides under the specific hydro-morphological conditions in small water bodies. Thus, an association of toxicity evaluating methods with different ecological indicators was to be attempted. Based on three random samples taken within the 2016 vegetation period, 23 headwater areas in the Saarland were investigated to test for pesticides and their metabolites. The macroinvertebrate population was also surveyed in 16 of these streams. Evidence was found of 41 substances in total. Most dominant substances include atrazine, isoproturone, quinmerac and tebuconazol as well as metabolites of dimethenamid, chloridazon and metazachlor. At 9 of the 23 sampling points, over 10 plant protection products and metabolites were found. Only 17% of the water bodies investigated contained fewer than 5 substances. Around half of the bodies of water investigated show noticeably high concentrations of metabolites of plant protection products. Maximum concentrations exceeding environmental quality standards or the Health-oriented Guideline Values were measured for 13 substances at individual sampling points. Analysis of the biological data for only 4 of the water bodies investigated resulted in the Ecological Status Class (ESC) "good". All others fell short of the quality target, although they were classified as "good" or "very good" according to the Saprobic index. SPEARpesticides as a measurement of the sensitivity of the biocoenosis to pesticides shows their influence in a few water bodies. Likewise, high toxic unit values have also been calculated, indicating the presence of toxic substances at relevant concentrations. However, an actual correlation between SPEARpesticides and toxic unit could not be derived. Clearly in these very headwater streams other habitat-determining hydromorphological factors overlay the toxic impact of pesticides.
DOI of the first publication: 10.1016/j.scitotenv.2017.11.155
URL of the first publication: https://www.sciencedirect.com/science/article/pii/S0048969717332126
Link to this record: hdl:20.500.11880/29320
http://dx.doi.org/10.22028/D291-31298
ISSN: 0048-9697
Date of registration: 24-Jun-2020
Faculty: HW - Fakultät für Empirische Humanwissenschaften und Wirtschaftswissenschaft
Department: HW - Geographie
Professorship: HW - Prof. Dr. Jochen Kubiniok
Collections:UniBib – Die Universitätsbibliographie

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