Fish gut bacteria break down plastic, but not as a team
Pasqualetti SM, Atwood J, Aderibigbe A, Russell E, O'Keefe K
Phytoremediation
The same microbial squabbles happening in a fish's gut are a reminder that soil and compost microbes don't just add up their effects, they compete and cancel each other out, which is worth remembering before you trust any single 'miracle' additive in your garden.
Researchers collected 184 bacteria from the guts of small fish living in cold Alaskan lakes and streams and tested whether any could break down plastic. One bacterium on its own started chemically wearing down polypropylene plastic (the stuff used in bottle caps and food containers), but when paired with a second bacterium from the same fish, that plastic-breaking activity stopped working. It's a small reminder that microbial communities, whether in a fish, a compost pile, or garden soil, don't just combine their powers, they can cancel each other out.
Key Findings
184 microbes were isolated from the guts of wild Alaskan threespine stickleback across six bodies of water and screened for lipase, esterase, and biofilm activity on PET and PP plastics.
A Pseudomonas trivialis strain showed measurable surface oxidation of polypropylene (PP) when grown alone, but no detectable changes occurred on PET from any isolate.
Co-culturing the PP-oxidizing strain with another gut isolate, Pseudomonas germanica, significantly suppressed the plastic-oxidizing activity, showing that microbial interactions can inhibit bioremediation potential.
chevron_right Technical Summary
Scientists found gut bacteria in Alaskan stickleback fish that can chemically alter plastic, but one of those microbes actually shuts down another's plastic-breaking ability when the two live together, showing that microbial teamwork (or lack of it) matters for cleaning up plastic pollution in cold water.
Abstract Preview
Original paper
Cold-water gut isolate from threespine stickleback (Gasterosteus aculeatus) reveals polypropylene surface oxidation and co-culture inhibition.
Polyethylene terephthalate (PET) and polypropylene (PP), two of the most widely produced plastics in the United States, persist in diverse environments worldwide and may persist longer in cold-wate...
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