What is Eurasian Watermilfoil?
Eurasian Water-Milfoil (EWM) is an invasive aquatic plant native to Europe, Asia, and northern Africa. It was first introduced to North America in the 1940’s and has since spread rapidly. EWM is known to be a fast growing, submerged plant growing in water as deep as 10m, although it typically prefers depths of 1-3m. This invasive plant shares a visual resemblance to native milfoil, displaying delicate green leaflets that create a feathery appearance. It also has the ability to hybridize with native milfoil species, further complicating its identification. A recent lake survey conducted late in the summer and early fall has confirmed the presence of EWM in our lake.
What are the impacts of EWM?
EWM has significant ecological and recreational impacts including:
- Reduced Biodiversity: EWM competes aggressively with native aquatic plants, displacing them and reducing overall biodiversity. Decomposing EWM material can also lead to decreased oxygen levels, which can negatively affect fish populations.
- Recreational Impacts: The dense mats of vegetation can interfere with recreational activities such as swimming, boating, and fishing.
Where has it been found in Skootamatta?
Our scouting has determined that EWM is present throughout the lake. As anticipated, clusters were commonly found in proximity to popular fishing spots and public access points.
How is it spread?
EWM primarily spreads through fragmentation. Small pieces of the plant can easily break off and from new roots in a matter of days. It is also easily transported between water bodies by currents, boats, and fishing gear.
What should you do if you spot EWM?
If you come across EWM the best action is to leave it undisturbed and avoid any actions that may cause fragmentation. While individual plants found near docks and shore can be carefully removed by following strict guidelines, caution is crucial. Breaking even a small piece off a single plant can lead to further spread and cause more harm than good.
What is the SDRA doing about it?
The SDRA is actively collaborating with neighboring lake associations and conservation authorities to determine the best course of action. Currently, we are working on creating a map that highlights the locations found of EWM clusters. This map will be shared with our members to raise awareness of areas with confirmed EWM infestations and will provide a baseline for continued monitoring.
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