Researchers from the Minnesota Aquatic Invasive Species Research Center periodically present on their research findings via webinar. View recent webinars below, and stay tuned for more in the future!
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Zebra mussel suppression
Zebra mussels (Dreissena polymorpha) are one of the most problematic invasive species in Minnesota, causing significant ecological and economic impacts in waterbodies where they have established. The Minnesota Aquatic Invasive Research Center (MAISRC) has partnered with the U.S. Geological Survey (USGS) to develop zebra mussel suppression strategies that will reduce ecological and economic impacts to infested waterbodies and reduce the risk of spread to uninfested waterbodies. This project built on several years of promising research, culminating with the largest scale low-dose/long-duration treatment ever attempted. Considerable efforts were made to test the effectiveness of the treatment on zebra mussels, as well as potential non-target impacts on a variety of vertebrate and invertebrate animals and water quality parameters. The pre- and post-treatment monitoring was robust and included extensive sampling in St. Albans (EarthTec QZ treated) and Robinsons (untreated control) Bays. Preliminary results suggest that treatments effectively reduced zebra mussel veliger density, juvenile zebra mussel recruitment, and live zebra mussel density. Non-target impacts varied and will be presented.
We estimate willingness to pay for local aquatic invasive species lake management in the form of a daily lake access fee by conducting summer lake surveys in Minnesota, USA. We also examined recreationists’ visit motivation, and aquatic invasive species perceived risk, knowledge, and awareness of problem. We estimate mean willingness to pay to be $10.41 per day, which did not differ significantly by lake. Perceived risk, awareness of problem, and visit motivation were significant in predicting willingness to pay, which could have important ramifications for aquatic invasive species management. All questions that were asked during the live session were saved and answered by Dr. Levers and Dr. Pradhananga in this document.
When anglers fish on a lake infested with spiny waterflea, they risk leaving the lake with infested gear. In this study, we tested a variety of common types of angling gear (fishing lines, livewells, bait buckets, anchor ropes, downriggers) in Lake Mille Lacs and Island Lake Reservoir. We measured the number of spiny waterflea that become ensnared on the gear, and how ensnarement rate is affected by natural lake density and time of day. Learn what you can do to help stop the spread of spiny waterflea! View the webinar's full Q & A document.
Hybrid watermilfoil, formed from the hybridization of the native northern watermilfoil (Myriophyllum sibiricum) and the invasive Eurasian watermilfoil (M. spicatum), has been present in Minnesota for over 20 years. Surveys in 2017 and 2018 documented hybrid watermilfoil in 28 of 62 lakes surveyed. Eurasian was found in 43 lakes. Most Eurasian populations were the same clone and only six genotypes were found, but hybrid watermilfoil was much more diverse; 51 genotypes of hybrid watermilfoil were noted. The concern with hybrid watermilfoil is that some genotypes may be more invasive or resistant to commonly used herbicide. This webinar provides updated results from 2019, including results from additional lakes and response to management activities in a set of intensively studied lakes. All questions were recorded during the webinar and answered by the researchers afterward. View the Q & A document here: z.umn.edu/HWMwebinarQandA
Common carp control
Common carp are one of the most widespread invasive fish globally. In this talk, Przemek Bajer, a MAISRC Research Assistant Professor presents a brief history of common carp introductions around the world, explains their impacts on lake ecosystems and shows some of the new and innovative tools we use in carp management. These tools will include autonomous systems for removing carp during spawning migrations, and conditioning strategies that exploit carp’s social behaviors to train them with food and remove.