UNDATED, WI (WTAQ) - Tiny plastic particles have now been discovered in all five Great Lakes.
The plastics were first found a year ago in Lakes Superior, Huron, and Erie.
UW Superior researcher Lorena Rios-Mendoza now says studies this summer showed small concentrations of plastic particles in Lakes Michigan and Ontario.
She said Lake Erie apparently has the largest concentration of plastics, because the particles often float downstream from the upper lakes.
She said the tiny plastics have also been found in Lake Superior’s sediment – which means at least some of the plastics are heavy enough to sink and not float on the surface.
Researchers used fine-mesh nets to pull up some of the plastics. Some of it can be only been seen through a microscope.