09-24-2018 Council Packet - Laserfiche WebLink

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researchers from the U of M and Montana State University to provide a preliminary characterization of hybrid milfoil in Lake Minnetonka and Christmas Lake, and examine how milfoil genetics may relate to herbicide treatments and biological control efficacy. This was a pilot study, with a goal to inform management and devise more detailed studies that will improve control strategies. Work occurred in St. Albans Bay, Grays Bay and North Arm Bay of Lake Minnetonka, as well as Christmas Lake. Hybrid Milfoil Study — Year 2 (2016) MCWD received a $20,000 Hennepin County AIS grant to continue the Hybrid Milfoil study with researchers from the U of M and Montana State University. This study expanded on data collected from year one. Data from year one showed promising information to understand the occurrence and distribution of different native and invasive milfoil genotypes in Lake Minnetonka and Christmas Lake. Supporting Local Partners AIS Early Detection (2011 —present) Early detection of AIS can provide for an opportunity to manage and control AIS species before they become widespread and established in a waterbody, at which point management and control can become costly, and the chances of spread from the lake increase. MCWD developed protocols and conducted early detection monitoring to look for new AIS in waterbodies across the District. The protocols developed served as a model for our partners to conduct early detection monitoring through their staff and/or volunteers. MCWD also developed a volunteer early detection guide book that provided simple monitoring instructions and photo ID of different AIS. The guide book was widely popular with both our partners within the District, and agencies statewide. Christmas Lake Rapid Response (2014-2015) Through routine early detection monitoring, MCWD staff discovered zebra mussels at the Christmas Lake boat launch. With the infestation appearing to be contained to the boat access area of the lake, MCWD partnered with MN DNR, City of Shorewood, Christmas Lake Homeowners Association, MN AIS Research Center and Blue Water Science to rapidly respond to the infestation. The partners conducted a two-year rapid response effort to attempt eradication of the zebra mussels. Eradication did not occur, but many lessons were learned that would inform future rapid response efforts. Lake Minnewashta Rapid Response (2016-2017) Through routine early detection monitoring, MCWD staff discovered zebra mussels at the Lake Minnewashta boat launch. The infestation again appeared to be contained to an enclosed bay near the public access. MCWD partnered with Carver County, MN DNR, and Lake Minnewashta Preservation Association to rapidly respond to the infestation and treat the largest area yet (29 acres) to be treated for zebra mussels in Minnesota. Lessons learned from Christmas Lake were applied to Lake Minnewashta. Control of zebra mussels within the treatment areas appeared to be successful, however, by 2018 zebra mussels were found in the main area of the lake. The response efforts in Christmas Lake and Lake Minnewashta show the difficulty of containing and managing zebra mussels. Lake Harriet zebra mussel search (2017) We collaborate with public and private partners to protect and improve land and water for current and future generations. 15320 Minnetonka Boulevard, Minnetonka, MN 55345 • (952) 471-0590 • Fax: (952) 471-0682 • www.minnehahacreek.org