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Reuben Keller & David Lodge
Presentation to: Invasive Plant Species Assessment Working Group Indianapolis, Nov. 30, 2004
Invasive aquatic plants in Indiana
Species available through watergarden and aquarium trades Statistical risk assessment for invasive aquatic plants in the Midwest
Eurasian watermilfoil (Myriophyllum spicatum) is established in 175 lakes and reservoirs, and many waterways
Curly-leafed pondweed (Potamogeton crispus)
Purple loosestrife (Lythrum salicaria) is established across IN
~$803,000 spent each year just on herbicide control
More spent on biocontrol
Value of lost opportunities (boating, fishing etc.) not estimated
Watergardening (e.g. purple loosestrife) Aquariums (e.g. Eurasian watermilfoil, curly-leafed pondweed) Landscaping, erosion control (e.g. reed canary-grass Phalaris arundinacea)
Federal noxious weed list (19 species) + Lythrum
Invasive aquatic plants have significant ecological and economic impacts in Indiana Most are intentionally introduced Current regulations are inadequate Preventing introduction is the best way to prevent future impacts
What species are available?
What risks are posed?
Availability of known invasives
Watergarden and aquarium trades are spreading potential and known invaders Plants are often incorrectly identified by vendors Plant trade is a vector for the transfer of many contaminant species
Invasive aquatic plant species are a significant economic and ecological problem in Indiana Preventing introduction is the best way to stop further damages Many actually or potentially invasive species are being spread through trades Risk assessment is possible and accurate