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Aquatic Invasive Species in Mayflower Lake, Marathon Co. Paul Skawinski– Regional AIS Education Specialist Golden Sands RC&D December 10th, 2013 Known Mayflower Lake AIS • Curly-leaf pondweed (Potamogeton crispus) (WDNR) • Chinese mystery snail (Bellamya chinensis) (2010) • Banded mystery snail (Viviparus georgianus) (2013) • Purple loosestrife (Lythrum salicaria) (2010) Marathon County AIS surveys All Marathon County public lakes surveyed in 2010. Surveys will be repeated in 2014. Objectives: Detect early populations of AIS Map locations of these (GPS) Involve interested lake residents Work with residents to remove/control AIS Create list of native plant species observed Curly-leaf Pondweed Potamogeton crispus • Accidentally introduced as aquarium plant (1880s) • Fairly widespread – known in 517 water bodies (Dec 2013) • Active from October-June in most lakes • Can form dense mats, interfering with recreation and native plants Paul Skawinski Paul Skawinski Curly-leaf pondweed turions Paul Skawinski Curly-leaf pondweed turions Chinese mystery snail Bellamya chinensis Operculum Chinese mystery snail Bellamya chinensis Introduced as a food item from Asia Up to 3” tall Banded mystery snail Viviparus georgianus Introduced via aquarium dumping Brown horizontal bands on shell Up to 1.5” tall Purple Loosestrife Lythrum salicaria Paul Skawinski • Imported from Europe for gardens (late 1800s), also seeds in ballast water • Crowds out native wetland species • Spreads rapidly: >1 million seeds annually, plus vegetative spread Purple Loosestrife ID • Square stem (6-sided on old plants) • Opposite or whorled leaves • Leaf margins are smooth • Flowers pink or purple in spike arrangement, each with 6 petals Paul Skawinski Zebra Mussels Dreissena polymorpha • Ballast water introduction to the Great Lakes in 1980’s • Known from 178 WI inland lakes (Dec 2013) • Attach to any hard surface - may reach tens of thousands per square meter! • Female can produce 1 million eggs/season • Filter feeders Zebra Mussels Dreissena polymorpha Eaten on small scale by some animals Currently no management options Paul Skawinski Paul Skawinski Zebra Mussels Dreissena polymorpha Larvae are microscopic, free-floating Can be attached to plants Paul Skawinski Eurasian Water-milfoil Myriophyllum spicatum • First found in WI in 1960s • Currently known in 721 WI lakes (Dec 2013) • Forms dense mats interferes with water recreation • Can spread from small fragments Eurasian Watermilfoil Spread Eurasian Watermilfoil Spread Uh oh Eurasian Watermilfoil Spread Eurasian Watermilfoil Spread Eurasian Watermilfoil Spread Adventitious roots Northern watermilfoil Myriophyllum sibiricum Eurasian watermilfoil Myriophyllum spicatum Northern watermilfoil (M. sibiricum) at west end of Mayflower Lake Paul Skawinski Paul Skawinski Look-alike native species Coontail Elodea Paul Skawinski Bladderworts Monitoring is essential to prevention Get trained on identification of AIS and look-alike native species Keep an eye out for AIS while fishing, boating, snorkeling, etc. Know who to contact with questions or suspected AIS specimens Finding invasives early is crucial for inexpensive, easy management (eradication?) Questions? Paul Skawinski AIS Education Specialist – Portage, Wood, Waupaca, Waushara, Marathon Counties Golden Sands Resource Conservation & Development Council, Inc. (RC&D) 715-343-6278 [email protected]
