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BOATING

Boaters: Maine needs you in battle against unwelcome invaders

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GAIL RICE
July 5, 2009

In August 2008, a visitor to Salmon Lake in Belgrade noticed some suspicious plants near the public boat landing at Kozy Cove. The visitor, a fisheries biologist from Tennessee who understood the threat that invasive aquatic plants pose to Maine's lakes and ponds, wasted no time notifying the proper authorities.

The plant was identified as Eurasian water milfoil, and quick action by state agencies and volunteers to remove it and ensure it would not spread means that the prognosis for Salmon Lake, also known as Ellis Pond, is encouraging.

Eurasian water milfoil is considered to be one of the most aggressive invasive aquatic plants in North America. It is believed to be rare in Maine, having been detected in only two bodies of water so far (the other being Pleasant Hill Pond in Scarborough).

It's one of 11 invasive plant species of concern, and it is among four such species to have actually been found in Maine inland waters. The other three are variable water milfoil, curly leaf pondweed and hydrilla.

At the end of 2008, invasive aquatic plants had been found in 30 Maine lakes and ponds, out of 374 that had been screened since 2001.

Boaters can – and should – play a key role to prevent further infestations of such plants on Maine's inland waterways. They're among the most likely to spread the infestation to more lakes and ponds by transporting plant fragments on their boats, motors, trailers and other equipment. But an alert boater can help by knowing what plants to look for and what to do if they're found.

"If we can be aware and practice good habits when we launch and haul boats, we can make a real difference and keep invasive plants and organisms from getting into Maine lakes," says Roberta Hill, program director for the Maine Center for Invasive Aquatic Plants, part of the Volunteer Lake Monitoring Program.

The fight against invasive aquatic plants in Maine has three major elements: prevention, early detection and rapid response. The case in Belgrade illustrates the importance of the latter two elements.

But where boaters can help the most is with the first line of defense – prevention – which Hill describes as "the best bang for the buck" when it comes to stopping the spread.

The center has been working since the late 1990s to educate the boating public about what these plants look like, how they can harm Maine lakes and ponds, and what boaters can do to stop them from spreading. The battle kicked into high gear in 2002, when the state launched its Courtesy Boat Inspection Program, funded through the sale of lake and river protection stickers. All registered boats operated on inland waters must have a sticker.

The VLMP has trained hundreds of volunteers and state agency personnel on plant identification. These "citizen scientists" have become a familiar sight at boat ramps, where they ask questions and invite boaters to help inspect their watercraft and gear.

The volunteers hope boaters will get into the habit of self-inspecting when they launch or haul their boats.

Specifically, boaters on inland waters should inspect their craft and equipment thoroughly before every launch and after every haul-out. This includes not just the boat, trailer and motor, but also the anchor lines, fishing and dive gear, live wells, and even floating toys and duck decoys. If you find something, remove it, carry it to a location well away from the shoreline, and bury it.

"Anything that goes into one body of water, comes out, then goes into another lake or pond, is a potential vector," says Hill. She adds that the tiniest traces of invasive plant and animal species can be virtually invisible to the naked eye, so washing your boat bottom and letting it dry out for a few days before launching in other waters is an even better idea.

Considering that these invasive aquatic plants can damage habitat, crowd out native animal and plant species and impair fishing and recreational experiences, it's in boaters' best interests to aid to the effort.

More information on invasive aquatic plants, including a workshop schedule for new volunteers and reference sheet, can be found at VLMP's Web site at www.mainevolunteerlakemonitors.org/mciap.

Gail Rice of Freeport and her husband, Randy, race and cruise their Pearson 30 sloop on Casco Bay. She can be reached at:

gnrice@yahoo.com

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