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Interactions Between Plastic, Microbial Biofilms and Gammarus pulex: An Initial Investigation
Summary
This laboratory study examined whether microbial biofilms on plastic surfaces increase palatability and interaction with the freshwater amphipod Gammarus pulex. The amphipods did not consume or fragment the plastic discs, and the presence of biofilm-covered plastic did not significantly alter their feeding behavior.
There is increasing evidence that microbial biofilms which form on the surface of marine plastics can increase plastics palatability, making it more attractive to organisms. The same information, however, does not exist for freshwater systems. This study observed the response of the freshwater amphipod Gammarus pulex when exposed to 3 cm-diameter discs of biofilm-covered plastic, both alone and when presented alongside its natural food. G. pulex did not fragment or consume the plastic materials, and the presence of colonised plastic in the immediate environment did not alter the amount of time organisms spent interacting with their natural food. This study provides baseline information for virgin and microbially colonised low-density polyethylene and polylactic acid film. Further studies, with other types of plastic possessing different physical properties and with different microbial biofilm compositions are now required to build further understanding of interactions between plastic, microbial biofilms, and freshwater shredding invertebrates.