Black Lake Stewardship Society


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Thu Ngo
FRIENDS OF BLACK LAKE
Under $100
Daphne McGregory
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Virginia Matson

Eurasian Water Milfoil

 

Threats to recreation:

Eurasian watermilfoil can grow to the surface in waters as deep as 20 feet. When mature, the plant forms a dense surface mat or canopy that may be thick enough for birds to walk on. Boating, swimming and fishing activities are often inhibited by this mass of vegetation.

Threats to lake ecology:

Due to its aggressive early-season growth, Eurasian watermilfoil displaces nearly all native submergent plant species. Studies have shown that this reduced plant diversity results in a reduced diversity of invertebrates and other organisms that fish feed upon.

Threats to fisheries:

The extremely dense plant beds formed by Eurasian watermilfoil provide excellent cover for juvenile panfish - to the point where they are virtually inaccessible to predator fish. This typically results in overabundant, stunted populations of panfish. Correspondingly, growth rates of predator fish such as largemouth bass and northern pike are reduced.

Water quality impacts:

Stagnant, oxygen-depleted conditions are often found in association with dense beds of Eurasian watermilfoil. The sudden nutrient release caused by the late-season die back of massive plant beds may also cause nuisance algae blooms.

Economic impacts:

Millions of dollars are spent annually to control Eurasian watermilfoil. Left unchecked however, the loss of real estate values and the losses to tourism and recreation-based industries would be far greater.

 

click here to view map of where Eurasian Watermilfoil has been found and removed from Black Lake over past 5 years.

Eurasian Water Milfoil (Myriophyllum spicatum)

DESCRIPTION: Eurasian water milfoil is a submersed aquatic plant native to Europe, Asia, and northern Africa.  Like most of the native milfoils, the Eurasian variety has slender stems whorled by submersed feathery leaves. The stems of Eurasian water milfoil tend to be limp, and may show a pinkish-red color.

Eurasian water milfoil grows best in fertile, fine-textured, inorganic sediments. In less productive lakes, it is restricted to areas of nutrient-rich sediments. It has a history of becoming dominant in eutrophic, nutrient-rich lakes, although this pattern is not universal. It is an opportunistic species that prefers highly disturbed lake beds, lakes receiving nitrogen and phosphorous-laden runoff, and heavily used lakes. Optimal growth occurs in alkaline systems with a high concentration of dissolved inorganic carbon. High water temperatures promote multiple periods of flowering and fragmentation.

LIFE HISTORY AND EFFECTS OF INVASION: Unlike many other plants, Eurasian water milfoil does not rely on seed for reproduction. Its seeds germinate poorly under natural conditions. It reproduces vegetatively by fragmentation, allowing it to disperse over long distances. The plant produces fragments after fruiting once or twice during the summer. These shoots may then be carried downstream by water currents or inadvertently picked up by boaters. Milfoil is readily dispersed by boats, motors, trailers, bilges, live wells, or bait buckets, and can stay alive for weeks if kept moist.

Once established in an aquatic community, milfoil reproduces from shoot fragments and stolons (runners that creep along the lake bed). As an opportunistic species, Eurasian water milfoil is adapted for rapid growth early in spring. Stolons, lower stems, and roots persist over winter and store the carbohydrates that help milfoil claim the water column early in spring, photosynthesize, divide, and form a dense leaf canopy that shades out native aquatic plants. Its ability to spread rapidly by fragmentation and effectively block out sunlight needed for native plant growth often results in monotypic stands. Monotypic stands of Eurasian milfoil provide only a single habitat, and threaten the integrity of aquatic communities in a number of ways; for example, dense stands disrupt predator-prey relationships by fencing out larger fish, and reducing the number of nutrient-rich native plants available for waterfowl.

Dense stands of Eurasian water milfoil also inhibit recreational uses like swimming, boating, and fishing. Some stands have been dense enough to obstruct industrial and power generation water intakes. The visual impact that greets the lake user on milfoil-dominated lakes is the flat yellow-green of matted vegetation, often prompting the perception that the lake is "infested" or "dead". Cycling of nutrients from sediments to the water column by Eurasian water milfoil may lead to deteriorating water quality and algae blooms of infested lakes.

CONTROLLING EURASIAN WATER MILFOIL: Preventing a milfoil invasion involves various efforts. Public awareness of the necessity to remove weed fragments at boat landings, a commitment to protect native plant beds from speed boaters and indiscriminate plant control that disturbs these beds, and a watershed management program to keep nutrients from reaching lakes and stimulating milfoil colonies--all are necessary to prevent the spread of milfoil.

Monitoring and prevention are the most important steps for keeping Eurasian water milfoil under control. A sound precautionary measure is to check all equipment used in infested waters and remove all aquatic vegetation upon leaving the lake or river. All equipment, including boats, motors, trailers, and fishing/diving equipment, should be free of aquatic plants.

Lake managers and lakeshore owners should check for new colonies and control them before they spread. The plants can be hand pulled or raked. It is imperative that all fragments be removed from the water and the shore. Plant fragments can be used in upland areas as a garden mulch.

Hand pulling is the preferred control method for colonies of under 0.75 acres or fewer than 100 plants. The process is both thorough and selective (not to mention time-consuming); special care must be taken to collect all roots and plant fragments during removal. Sites remote from boat traffic can be covered with bottom screens that are anchored firmly against the lake bed to kill grown shoots and prevent new sproutings, but screens must be removed each fall to clean off sediment that encourages rooting. Buoys can mark identified colonies and warn boaters to stay away.