Tracing the fate of microplastic carbon in the aquatic food web by compound-specific isotope analysis
Taipale, S.J.; Peltomaa, E.; Kukkonen, J.V.K.; Kainz, M. J.; Kautonen, P.; Tiirola, M. (2019). Tracing the fate of microplastic carbon in the aquatic food web by compound-specific isotope analysis. Scientific Reports, 9, 19894. DOI: 10.1038/s41598-019-55990-2
Published inScientific Reports
© The Author(s) 2019
Increasing abundance of microplastics (MP) in marine and freshwaters is currently one of the greatest environmental concerns. Since plastics are fairly resistant to chemical decomposition, breakdown and reutilization of MP carbon complexes requires microbial activity. Currently, only a few microbial isolates have been shown to degrade MPs, and direct measurements of the fate of the MP carbon are still lacking. We used compound-specific isotope analysis to track the fate of fully labelled 13C-polyethylene (PE) MP carbon across the aquatic microbial-animal interface. Isotopic values of respired CO2 and membrane lipids showed that MP carbon was partly mineralized and partly used for cell growth. Microbial mineralization and assimilation of PE-MP carbon was most active when inoculated microbes were obtained from highly humic waters, which contain recalcitrant substrate sources. Mixotrophic algae (Cryptomonas sp.) and herbivorous zooplankton (Daphnia magna) used microbial mediated PE-MP carbon in their cell membrane fatty acids. Moreover, heteronanoflagellates and mixotrophic algae sequestered MP carbon for synthesizing essential ω-6 and ω-3 polyunsaturated fatty acids. Thus, this study demonstrates that aquatic micro-organisms can produce, biochemically upgrade, and trophically transfer nutritionally important biomolecules from PE-MP. ...
PublisherNature Publishing Group
Publication in research information system
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Additional information about fundingThis research was supported by the Department of Environment and Biological Sciences of University of Jyväskylä, Academy of Finland (project 323063) and the European Research Council (ERC CoG 615146) under the European Union’s Seventh Framework Programme (FP/2007-2013). We thank Hannu Nykänen for helping in calculations, Nina Honkanen, Emma Pajunen and Mervi Koistinen for helping in the laboratory work and Elina Virtanen in assisting in the sequencing. ...
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