A Vital Fight
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IT’S VITAL TO FIGHT THE SPREAD OF INVASIVE SPECIES IN MAINE

by Robert Varney, Maine Sunday Telegram, August 31, 2003

 Newspaper headlines across New England tell the story: “Lake residents worry about wild growth of weeds: “Foreign earthworms threaten forest health”: Maine’s milfoil madness.”  No, this isn’t from your supermarket tabloids.  Every week newspapers in Maine and NE are reporting on invasive animals and plants being introduced in areas where they didn't exist before and how they threaten native ecology.

 Like all NE states, Maine is suffering from an invasion of these plant and animal species into the landscape and coastal waters.  At least 45 species of invasive plants and animals now exist in Maine.  Plants such as purple loosestrife...dominate many of Maine’s freshwater marshes and forested wetlands, especially in southern and central Maine.  Once invasive species are introduced, managing and controlling them is a significant challenge.  That’s why the Maine DEP is spearheading an effort to prevent the introduction and spread of invasive species. 

 Last fall, DEP issued an “Action Plan for Managing Invasive Aquatic Species.”  This pro-active, four-year plan focuses on educating the public, preventing new invasive aquatic species and limiting the spread of established populations.  As part of this plan, watercraft are inspected for milfoil and other invasive aquatic plants.

 Invasive species are a concern for a number of reasons.  They generally lack predators or other natural controls and can tolerate a wide variety of environmental conditions, which allows them to easily establish self-sustaining populations.  Once established, invasive species threaten the natural diversity and abundance of native species as well as the stability of entire ecosystems.  Native species lose in the competition for habitat, breeding sites and food.  As a result, food webs are destroyed.  The economic consequences can be severe. 

 Among the most common invasive species in Maine is the variable-leaf milfoil, an aggressive aquatic plant that has infested at least 15 ponds and streams throughout western, southern and central Maine. (note: this species has already been found in neighboring Thompson Lake, Middle Range Pond and Lake Auburn).

Invasive species can be transported among water bodies by boats and trailers.

 This country spends hundreds of millions of dollars every year trying to control aquatic invasive species.  Money is most wisely spent on prevention, since once and invasive species takes hold, it is virtually impossible to eliminate it.   Controlling invasive species costs $200 to $2000 per lake-acre each year.  Research in Vermont shows that invasive plants can cost shoreline owners more than $12,000 each in lost property values on infested lakes. 

 According to the Maine DEP, if the state experienced a fraction of Vermont’s infestation rate just in its five southern counties, the property value loss alone could exceed $11 million and control costs could reach $2 million to $4 million a year.  These figures would be substantially higher when lost tourism dollars, fishing and water sports opportunities are factored in.


We all need to realize that preventing invasive species will require hard work.  State, local and federal governments must play a leading role in identifying and preventing the spread of invasive species. But government personnel cannot be at every boat ramp and constantly patrol every lake and waterway. 

 To face the challenge, we need to quickly and dramatically increase the number of watershed groups, lake associations, boaters, fishermen and citizen volunteers who can act as our “eyes” and “ears” to catch and prevent these threats as early as possible.