| Autor: |
Langenfeld D; International Institute for Sustainable Development Experimental Lakes Area, Winnipeg, Manitoba R3B 0T4, Canada.; Department of Entomology, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada., Bucci K; Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario M5S 3B2, Canada., Veneruzzo C; Department of Biology, Lakehead University, Thunder Bay, Ontario P7B 5E1, Canada., McNamee R; Department of Biology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada., Gao G; Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario M5S 3B2, Canada., Rochman CM; Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario M5S 3B2, Canada., Rennie MD; Department of Biology, Lakehead University, Thunder Bay, Ontario P7B 5E1, Canada., Hoffman MJ; School of Mathematics and Statistics, Rochester Institute of Technology, Rochester, New York 14623, United States., Orihel DM; Department of Biology and School of Environmental Studies, Queen's University, Kingston, Ontario K7L 3N6, Canada., Provencher JF; Ecotoxicology and Wildlife Health Division, Environment and Climate Change Canada, Ottawa K1S 5B6, Canada., Higgins SN; International Institute for Sustainable Development Experimental Lakes Area, Winnipeg, Manitoba R3B 0T4, Canada., Paterson MJ; International Institute for Sustainable Development Experimental Lakes Area, Winnipeg, Manitoba R3B 0T4, Canada.; Department of Entomology, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada. |
| Abstrakt: |
To assess the potential risks of contemporary levels of plastic pollution in freshwater ecosystems, a large-scale experiment was conducted over 10 weeks in a boreal lake at the IISD-Experimental Lakes Area (Ontario, Canada). Fragments of common polymers (polyethylene, polystyrene, and polyethylene terephthalate), each with distinct colors and buoyancies, were added as a single pulse to seven in-lake mesocosms in equal contributions in a range of environmentally relevant nominal concentrations (6-29,240 particles/L). Two additional mesocosms with no added microplastics were used as controls. Zooplankton ingested low levels of microplastics (mean of 0.06 particles/individual ± SD 0.07) and generally their total abundance and community composition were not negatively impacted. Temporary changes were however observed; total zooplankton abundance and abundance of calanoid copepods were temporarily stimulated by increasing nominal microplastic concentrations, and modest, short-term reductions in egg production of the cyclopoid copepod Tropocyclops extensus and abundance of copepod nauplii occurred. Collectively, these results suggest that microplastics could have complex impacts on zooplankton communities, stimulating some species while negatively impacting others. |
