This is the best summary I could come up with:

But rather than providing a solution to the threat plastics pose to aquatic life, the tiny creatures known as rotifers could be accelerating the risk by splitting the particles into thousands of smaller and potentially more dangerous nanoplastics.

The scientists sought to examine what role aquatic life might play in microplastic creation, especially after the discovery in 2018 that Antarctic krill are able to break down polyethylene balls into fragments of less than one micrometre.

Baoshan Xing, a professor of environmental and soil chemistry at the University of Massachusetts Amherst’s Stockbridge School of Agriculture, said they decided to look at rotifers because they had specialised chewing apparatus similar to krill.

After exposing marine and freshwater species of rotifers to a variety of different plastics of different sizes, they found all could ingest microplastics of up to 10 micrometres (0.01mm), break them down and then excrete thousands of nanoplastics back into the environment.

Microplastics have contaminated every corner of the planet, from the top of Mount Everest to the depths of the Mariana Trench, and research has shown they are in many humans’ blood and heart tissue and the placentas of unborn babies.

Jian Zhao, a professor of environmental science and engineering at the Ocean University of China and the paper’s lead author, said nanoplastics were not only potentially toxic to various organisms but served as carriers for other contaminants.

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