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Impacts of Pharmaceuticals on Microbial Colonization of Microplastic in Streams
Summary
This study examined how pharmaceutical contaminants in streams affect microbial communities that colonize microplastics. Pharmaceutical-exposed microplastics developed distinctly different microbial communities than unexposed ones, suggesting that the combined presence of microplastics and pharmaceuticals creates novel ecological conditions in urban waterways.
Microplastic and pharmaceuticals are common contaminants in urban streams, both interacting with stream biota including microbial communities. Previous studies have assessed the effects of these contaminants on microbial communities individually, but microplastics can adsorb pharmaceuticals from aquatic environments, with unknown impacts on microbes. It was predicted that microplastics exposed to pharmaceuticals would have different microbial communities relative to those on microplastic alone. This hypothesis was tested in mesocosms containing stream water and biofilm-colonized rocks, amended with microplastic with and without a mixture of 16 pharmaceuticals. After 5- and 10-days exposure, microbial communities colonizing microplastic were analyzed by amplicon sequencing.