starry stonewort in silver lake - uwspstarry stonewort in silver lake washington county, wi brad...
TRANSCRIPT
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Starry Stonewort in Silver LakeWashington County, WI
BRAD STECKART – AIS COORDINATOR FOR WASHINGTON AND WAUKESHA COUNTIES
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Brad Steckart
-AIS coordinator for Washington and Waukesha Counties
-Graduated from UWSP in 2013 with BS in biology and a minor in conservation biology
-Interested in reptiles/amphibians/insects/arthropods
-Got an internship at Golden Sands RC&D as an Environmental Education Coordinator
-Lead to this job for the past two years
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What is starry stonewort? Starry stonewort (Nitellopsis obtusa) is a member of the
Characeae family Characeae are green algal macrophytes that can range in
size from centimeters to meters Chara and Nitella species are found around the world
Slide courtesy of WDNR
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Where did it come from?
Starry Stonewort Distribution
Slide: Courtesy WDNR
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Where is it within the US?
St Lawrence River – 1978 –thought to be from ballast
St Clair River – 1983 Michigan inland lakes in
2006 – unclear whether it took SSW a long time to move inland or whether it wasn’t recognized until after it had been there for some time
Slide: Courtesy WDNR
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Reproductive and Dispersal Capacity
• Capable of sexual and asexual reproduction• North American clones are all male – no zygotes produced• Asexual reproduction occurs by bulbil or plant fragments
Photo credit: Robin Sleith
Slide: Courtesy WDNR
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How might starry stonewort affect a lake?
May outcompete native aquatic plants
Thick “meadows” may prevent fish from spawning
Can become a navigational nuisance in shallow waters (< 6 feet)
Meadows may increase water clarity by minimizing sediment re-suspension
Photo: Paul Skawinsky
Slide: Courtesy WDNR
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Found in Wisconsin in September 2014
Slide: Courtesy WDNR
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Presentation Outline
Focus on 2 lakes infested in Washington County and treatment methods
Pike Lake Nitellopsis Discovery
Meetings with PRD
CBCW Grant
Outreach
Silver Lake Nitellopsis Discovery
Rapid Response
DASH Removal
Outreach
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Pike Lake, Washington County
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Starry Stonewort in Pike Lake 2015
Discovered during routine meander survey at boat launch
Population was large but not very dense… Patch here, patch there
Conducted Nitellopsis meander survey around entire lake
Present all around the lake
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What next?
Met with DNR, Pike Lake Association, and County Manual removal not an option – population too large
DASH would take too long/be too expensive
Manual removal would take even longer
Harvester would break up algae and bulbils would spread
Chemicals have made the problem worse in other lakes
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Warning Signs at Launches
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CBCW for 2016
Starry stonewort present in undisturbedareas around perimeter of lake Most dense population in SE bay
Clean Boats, Clean Waters grant awarded for 2016
Monitor population, keep updated maps
PI Survey 2016
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Silver Lake – Washington County, WI
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Silver Lake – Washington County, WI
122 acres
Drainage Lake
Depth: 47 feet
Substrate: sand/muck
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July 2015: Starry stonewort found in Silver Lake (Washington County) by SEWRPC conducting routine PI Survey.
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Verified next day by Ken Karol –New York Botanical Gardens
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Rake/Snorkel meanders: determined population distribution
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Rake/Snorkel meanders:determined population distribution
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Search Area
Visual Survey orVertical Rake Survey
Snorkel Meander
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Infested area determined to be about 1 acre in NE corner of lake near public boat launch.
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Hencshke Hillside Launch Closed
Washington County temporarily closed launch to motorized watercraft until DASH contractor completed removal
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Series of educational outreach sessions• Both Washington County and DNR
held info sessions open to the public about SSW
• High attendance rate allowed to get the word out about what was going on
• Allowed county and DNR to clearly explain problem and proposed solutions
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Applied for Rapid Response AIRR-190-16 GrantGrant requirements:
• DASH Harvesting
• Hand-pulling
• Clean Boats, Clean Waters efforts from Silver Lake Protection and Rehabilitation District
• Post-treatment surveys
• Report summarizing each removal event and CBCW data
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Pre – DASH Treatment
©Brad Steckart
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Eco Waterway was contracted for Diver Assisted Suction Harvesting (DASH)
DASH Benefits:• “Selective” harvesting allows diver to harvest nuisance
vegetation, leaving beneficial species intact• This allows native species to outcompete residual invasive
populations after project
• Does not completely destroy habitat for wildlife • Ability to harvest reproductive structures lodged in
sediment
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Diver Assisted Suction Harvesting
©Brad Steckart
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Diver-Assisted Suction Harvesting(DASH)Video
https://www.youtube.com/watch?v=ensWuwblU-k
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Diver Assisted Suction Harvesting (DASH)
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Harvested material is pumped through floating PVC to shore.
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Through chopping pump. Chops material into 3” pieces.
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From chopping pump to last water pump. Pumps to geotextile de-watering bags.
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3 De-watering bags (20 x 24’).
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Filled up fairly fast with water. Had to stop every two hours to dewater.
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Excess water directed through 50’ wetland buffer strip.
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Monitored SSW populations throughout DASH process. Marked where we saw existing populations with buoys.
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Formed strong partnerships between neighbors, DNR, County, and Silver Lake PRD.
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Pressure washed boat/equipment with bleach solution.
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In order to prevent this from happening. . .
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Disposed of geo-textile bags in allocated landfill away from area that could potentially drain into lake
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Disposed of geo-textile bags in allocated landfill away from area that could potentially drain into lake
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After one week of DASH, we estimate 90% reduction in Nitellopsis populations.
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Amount of Starry Stonewort Removed(estimated)
©Brad Steckart
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Post- DASH Treatment
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What Now?• Population is believed to be
90% reduced
• Continue to monitor boat launch area closely
• Native algae outcompetes starry stonewort and suppresses bulbil growth
• Strong focus on Clean Boats, Clean Waters education
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Focus on Clean Boats, Clean Waters
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Outreach and Education
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Keep Partnerships Strong
©Brad Steckart
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Continue monitoring starry stonewort and adapt to manage residual populations successfully
©Brad Steckart©Brad Steckart
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Thank You!Questions?