Structural and functional responses of benthic invertebrates to imidacloprid in outdoor stream mesocosms |
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| Authors: | JLT Pestana AC Alexander JM Culp DJ Baird AJ Cessna AMVM Soares |
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| Institution: | 1. Department of Biology, University of Saskatchewan, 112 Science Place, Saskatoon, Saskatchewan, Canada;2. School of Environment and Sustainability, 117 Science Place, University of Saskatchewan, Saskatoon, Saskatchewan, Canada;3. Pierre Mineau Consulting, 124 Creekside Dr., Salt Spring Island, BC V8K 2E4, Canada;4. Institute for Wetland and Waterfowl Research, Ducks Unlimited Canada, P.O. Box 1160, Stonewall, Manitoba, Canada;5. Faculty of Agriculture & Environment, University of Sydney, NSW 2015, Australia;6. UFZ, Helmholtz Centre for Environmental Research, Department System-Ecotoxicology, Permoserstrasse 15, 04318 Leipzig, Germany;7. Toxicology Centre, University of Saskatchewan, 44 Campus Drive, Saskatoon, Saskatchewan, Canada;1. UFZ – Helmholtz Centre for Environmental Research, Department System Ecotoxicology, Permoserstr.15, 04318 Leipzig, Germany;2. UFZ – Helmholtz Centre for Environmental Research, Department of Bioenergy, Permoserstr.15, 04318 Leipzig, Germany;3. UFZ – Helmholtz Centre for Environmental Research, Department of Ecological Chemistry, Permoserstr.15, 04318 Leipzig, Germany;4. University of Koblenz-Landau, Institute of Environmental Sciences, Fortstraße 7, 76829 Landau, Germany;5. UFZ – Helmholtz Centre for Environmental Research, Department of Analytical Chemistry, Permoserstr.15, 04318 Leipzig, Germany;6. TU Bergakademie Freiberg, Institute of Biosciences, Leipziger Straße 29, 09596 Freiberg, Germany;7. TU Bergakademie Freiberg, Institute of Organic Chemistry, Leipziger Straße 29, 09596 Freiberg, Germany;8. RWTH Aachen University, Institute for Environmental Research (Biology V), Worringerweg 1, 52074 Aachen, Germany |
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| Abstract: | Structural and functional responses of a benthic macroinvertebrate assemblage to pulses of the insecticide imidacloprid were assessed in outdoor stream mesocosms. Imidacloprid pulses reduced invertebrate abundance and community diversity in imidacloprid-dosed streams compared to control streams. These results correlated well with effects of imidacloprid on leaf litter decomposition and feeding rates of Pteronarcys comstocki, a stonefly, in artificial streams. Reductions in oxygen consumption of stoneflies exposed to imidacloprid were also observed in laboratory experiments. Our findings suggest that leaf litter degradation and single species responses can be sensitive ecotoxicological endpoints that can be used as early warning indicators and biomonitoring tools for pesticide contamination. The data generated illustrates the value of mesocosm experiments in environmental assessment and how the consideration of functional and structural endpoints of natural communities together with in situ single species bioassays can improve the evaluation and prediction of pesticide effects on stream ecosystems. |
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