Capital News Service

of the Michigan State University School of Journalism

Michigan prepares to combat Great Lakes invader

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Capital News Service

LANSING — When Matt Preisser thought he saw a photo of a potential Great Lakes invasive species in a newspaper, he tracked it down and checked it out.

“The plants in the photo were suspiciously similar to hydrilla,” said Preisser, who works for Michigan’s Aquatic Nuisance Control Program. “It was close enough that I didn’t want to pass it up and miss the chance to find out if that’s really what it was.”

It wasn’t hydrilla. But Preisser’s willingness to sniff out a fishy looking plant from a newspaper photo shows how serious biologists are about keeping this invader out.

Michigan is hydrilla-free, but the plant has reared its invasive head in three other Great Lakes states: Indiana, Wisconsin and Pennsylvania.

Hydrilla is the kind of organism that requires a coordinated response, according to scientists and other experts with the International Joint Commission, which advises the U.S. and Canadian governments on Great Lakes issues.

Hydrilla plant. Source: Maryland DNR

Hydrilla plant. Source: Maryland DNR

Hydrilla can form floating mats as large as 100 acres. The mats block sunlight from other plants and are too dense to serve as fish habitat, Preisser said. They also clog drinking water and irrigation systems.

Native to Asia, Europe, Africa and Australia, hydrilla grows in ropy stems covered in green leaves. It first invaded the U.S. in Florida around 1960 when unwitting aquarium enthusiasts likely dumped the plant into local waterways.

Once it took root, it reproduced like mad and crowded out native plants and wildlife. It has since spread to 19 states.
Hydrilla is almost impossible to get rid of once it’s established, Preisser said.

“In Florida and some of the other southern states it’s very extensive, and they’ve spent millions and millions of dollars trying to control it,” he said. “It’s still there, and these are annual efforts.”

So Great Lakes officials want a basin-wide plan that spells out exactly who does what if someone spots hydrilla so they can oust it before it gets too comfortably ensconced.

Their plan is intended to resolve key issues well ahead of any invasions so the response won’t bog down once the exotic species show up.

Those issues include permits and conflicts among local, state and federal regulation. Thus there’s a need to work out who’s in charge of a response and who’ll pay for it, said Mark Burrows, an International Joint Commission scientist and secretary of the Council of Great Lakes Research Managers based in Windsor, Ont.

Clearing up such potential obstacles to collaboration ahead of time will help prevent a messy situation where one state or nation knows about a hydrilla outbreak but its neighbors don’t find out until it’s too late.

“It causes a lot of bad relations and missed opportunities for response if everybody’s not fully informed on both sides of the border,” Burrows said.

The commission isn’t the first Great Lakes player to devise a plan that anticipates hydrilla’s arrival.

In 2004, Michigan’s Hydrilla Task Force drafted a “rapid response” plan to determine which state department would do what if hydrilla is found in the state.

Currently that’s the Department of Environmental Quality, although Gov. Jennifer Granholm has ordered the merger of DEQ and the Department of Natural Resources into a renamed Department of Natural Resources and Environment as of January 2010.

But the state’s plan still doesn’t say who will pay for it.

Roger Eberhardt, an environmental quality specialist in Michigan’s Office of the Great Lakes, said, “We can’t say that we would rapidly respond to hydrilla if it was found because we have no source of funding.”

When Indiana officials found hydrilla in Lake Manitou in 2006, they followed Michigan’s plan to squash the outbreak. Three years of chemical treatment and restricted boating access later, the infestation is more than 90 percent controlled, and it hasn’t spread to any other lakes in the state.

Indiana’s success is encouraging for cash-strapped states like Michigan.

“In Indiana, they didn’t have funding either,” Eberhardt said. “But they kind of cobbled together some money from their current programs.”

Some federal help could be on the way. Congress is considering $475 million for Great Lakes restoration, $60 million of which would go to fighting invasive species.

One priority for that funding is rapid response plans, said Hugh MacIsaac, co-chair of the International Joint Commission’s rapid response work group in Windsor.

“This would, for the first time, give states money to develop the types of plans that should be done to prepare for when the next bad invader comes in,” he said.

Jeff Gillies writes for Great Lakes Echo.


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