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European Frog-Bit the Next Aquatic Invasive Species to Watch For


European frog-bit is an aquatic plant introduced to the United States as an ornamental plant in 1932. It has since spread through shipping canals in parts of Canada and Michigan – as well as in rivers and lakes.

The frog-bit is a free-floating aquatic plant. Its leaves look like lily pads, but are small – only about 1 – 2 inches across. The plants produce a three-petaled white flower. The plant is problematic because it colonizes marshes, ditches and swamps as well as shorelines of lakes and rivers. The plant weaves itself together in a dense, floating mat that allows little light through. It crowds out native aquatic plants and keeps fish from using marshes.

The plant is not in Tip of the Mitt Watershed Council’s coverage area yet, but the organization is keeping an eye on the new invasive species.

 
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Invasive Aquatic Weed, Starry Stonewort, Creeps Across US - Scientists don’t know a lot yet about starry stonewort, but they’re hurrying to find out more. The plant, which forms dense surface mats in lakes, first turned up in North America in 1978 in the St. Lawrence River in New York state. Researchers think it probably arrived in ballast water from ships entering the Great Lakes.


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