2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/24/2018 | 11:30 AM - 11:45 AM | RESPONSES OF MACROINVERTEBRATE COMMUNITIES IN ROMANIAN STREAMS TO MULTIPLE AGRICULTURAL STRESSORS | 330 B

RESPONSES OF MACROINVERTEBRATE COMMUNITIES IN ROMANIAN STREAMS TO MULTIPLE AGRICULTURAL STRESSORS

Multiple anthropogenic stressors, many of which are associated with agriculture, contribute to the decline in freshwater biodiversity. Differentiating pesticide effects from those of other agricultural stressors, e.g. excessive nutrient or sediment input, is complicated by their co-occurrence in landscapes with intensive agriculture. To quantify the contribution of pesticides, we studied streams in a landscape in Eastern Europe, where traditional extensive agriculture (e.g. relying on horses) has remained beside highly industrialized agriculture. We hypothesized that excessive nutrient and sediment input would largely be unrelated to agricultural intensity, whereas pesticide use would increase with agricultural intensity. Moreover, we conducted a comprehensive pesticide survey, whereas most previous studies captured only a fraction. We sampled 19 small streams along a gradient from extensive to intensive agriculture for macroinvertebrate communities, pesticides and other relevant physico-chemical and landscape variables that may influence macroinvertebrates. Pesticides were sampled using two passive sampling techniques and we analyzed 246 pesticides and their metabolites. The association of invertebrate community composition with different stressors and the relative importance of the stressors will be presented. We discuss the relative importance of stressors and particularly pesticides with respect to the results from previous studies.

Impairment
Invertebrate
Community

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Presenters/Authors

Stefan Kunz (), University of Koblenz-Landau, Institute for Environmental Sciences, kunz2554@uni-landau.de;