| Title: | "Infochemicals Influence Neonicotinoid Toxicity-Impact in Leaf Consumption, Growth, and Predation of the Amphipod Gammarus fossarum" |
| Author(s): | Bundschuh M; Zubrod JP; Klottschen S; Englert D; Schulz R; |
| Address: | "iES Landau, Institute for Environmental Sciences, University of Koblenz-Landau, Landau, Germany. Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden. Eusserthal Ecosystem Research Station, University of Koblenz-Landau, Eusserthal, Germany" |
| ISSN/ISBN: | 1552-8618 (Electronic) 0730-7268 (Linking) |
| Abstract: | "Infochemicals act as inter- or intraspecific messengers. The literature suggests complex interactions between infochemicals (mainly predator cues) and chemical (e.g., pesticide) effects, with their direction and magnitude depending on the cue origin, pesticide identity, and test species. With the present study we assessed the impact of alarm cues alone and in combination with the neonicotinoid insecticide thiacloprid on leaf consumption, predation on Baetis nymphs, and dry weight of the amphipod Gammarus fossarum. Alarm cues (ground gammarids) and thiacloprid alone decreased gammarid leaf consumption with increasing intensities. At a defined alarm cue intensity, which alone did not cause a significant reduction in gammarid feeding, thiacloprid-induced feeding effects were additive. During an experiment targeting gammarid predation on Baetis nymphs (120 h), thiacloprid and alarm cues alone did increase and reduce predation significantly, respectively. Moreover, alarm cues led to a lower final gammarid dry weight. However, alarm cues did not affect response variables during a second predation experiment performed at a higher thiacloprid concentration (2 vs 0.75 microg/L). This discrepancy in alarm cue effects highlights either a varying susceptibility of the test species to these cues among experiments or that cue quality is fluctuating. Thus, the present study highlights a considerable variability in the individual and interactive effects of infochemicals and chemical stressors on aquatic biota, an insight relevant in the assessment of multiple stressors. Environ Toxicol Chem 2020;39:1755-1764. (c) 2020 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC" |
| Keywords: | "Amphipoda/drug effects/*growth & development Animals Factor Analysis, Statistical Insecticides/toxicity Larva/drug effects Neonicotinoids/*toxicity Plant Leaves/drug effects/*physiology Predatory Behavior/*drug effects Thiazines/toxicity *Toxicity Tests C;" |
| Notes: | "MedlineBundschuh, Mirco Zubrod, Jochen P Klottschen, Simon Englert, Dominic Schulz, Ralf eng 2020/06/17 Environ Toxicol Chem. 2020 Sep; 39(9):1755-1764. doi: 10.1002/etc.4802. Epub 2020 Jul 21" |
