Cornell University researchers say two new exotic zooplankton species have been found in Lake Erie.
The species are Diaphanosoma fluviatile, which is from Central and South America and the Caribbean, and Mesocyclops pehpeiensis, which is native to tropical and temperate areas of Asia. Scientists don't know how the zooplankton entered the lake but say it's the farthest north either species has been tracked in the Western Hemisphere. Experts say the discovery in the planet's largest fresh water system is alarming. Researchers are uncertain what risks the tiny creatures may pose. The university plans to monitor the situation but says both species haven't been deemed invasive because of their low abundance. The findings are part of the U.S. EPA's biology monitoring program in the Great Lakes.