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Researchers Study Invasive Mussels
Invasive zebra and quagga mussels were discovered for the first time in recent years around the Apostle Islands National Lakeshore on Lake Superior. National Park Service officials are working with researchers to find out how the aquatic hitch hikers got there.
Zebra mussels were first found in the Duluth-Superior harbor in 1989 while quagga mussels arrived in the ballast water of ships in 2005. The aquatic invaders tend to crowd out native freshwater mussels.
Julie Van Stappen with the Apostle Islands Nationahl Lakesore said divers discovered zebra mussels in 2015 and 2016 on the Sevona shipwreck near Sand Island.
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The Beginning of an Invasion
- At least three mats of hydrilla have been located, which Bob Johnson, retired Cornell University biology professor says can grow up to a foot a day, creating dense mats from bottom to surface in water up to 25 feet deep. Hydrilla fragments can easily be transported by boats and boat trailers which can sprout roots and establish new populations.
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