According to foreign media reports, according to the data of the United Nations Environment Programme, since the early 1950s, human beings have produced more than 8 billion tons of plastics, of which about 60% have not been recycled. Although it is very difficult for researchers to trace the direction of these wastes, their efforts are still finding evidence of their harmful effects on nature.

Recently, a group of scientists from the UK have found the first evidence that plastic waste in rivers moves up the food chain.

The team, made up of scientists from Cardiff University and Exeter University, hopes to find out all the possibilities that could affect wildlife in South Wales. For this reason, the researchers studied the excreta of Polygonum multiflorum. Hewu is a kind of river bird that feeds on insects and small fish. It can produce regular feces or ruminant particles of undigested food.

Of the 166 dropped and particulate samples studied, the team found that about half contained microplastic fragments. Microplastics are plastic fragments smaller than 5mm, which are very difficult to trace in the environment.

Dr David Santillo of the University of Exeter said: "our analysis shows that the Hewu in the study absorbed about 200 plastic particles from the insects they ate every day. More than 75% of the fragments we found are smaller than 0.5mm, but some are several millimeters long. We have long known that plastic particles, including polyester, polypropylene and nylon, pollute British rivers. But our forensic methods now reveal how these substances extensively contaminate the freshwater food web. The effects of chemicals and pollutants in these plastic products on Polygonum multiflorum and its young birds are yet to be observed. "

The researchers point out that the birds accidentally fed the insects they brought home for dinner to the nestling birds. The team said this was the first evidence that microplastics would flow from insects in rivers to predators, a finding echoed by a 2018 study that analyzed seal faeces and found evidence for the first time that plastic moved up the marine food chain.

Relevant research reports have been published in global change biology.

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