Aquatic Plant Management Planning Project Project Background - - PowerPoint PPT Presentation
Amnicon & Dowling Lakes Aquatic Plant Management Planning Project Project Background Aquatic Invasive Species Education, Prevention and Planning Grant Application Submitted to WDNR in August 2011 Awarded in October 2011
and Planning Grant Application
– Submitted to WDNR in August 2011 – Awarded in October 2011
– State Share = $25,030.00 – Amnicon-Dowling Lake Management District Share = $8,344.00
– Extended End Date – December 31, 2013
– A working document used to guide appropriate aquatic plant management – A tool for the Lake District to use to educate and inform property owners and lake users – A valuable exercise in planning to help understand the complexities in dealing with aquatic plants – DNR required document to complete aquatic plant management including non-native invasive species and native plants
Complete an Aquatic Plant Management (APM) Plan for both lakes
and the WDNR
– Early season curly-leaf pondweed and Eurasian water milfoil – Mid season all aquatic plants
– Current – historical paleocore
– Lake Use Survey – Draft APM Plan comment
– Watercraft inspection, AIS monitoring, AIS education and outreach, purple loosestrife beetle assessment
– Matt Berg, Proprietor
2012 and distributed to the Lake District
Curly-leaf Pondweed (CLP) Eurasian water milfoil (EWM)
to thin
Purple Loosestrife Reed Canary Grass Chinese Mystery Snails
501 points sampled, Maximum depth of plant growth = 11-ft, (43.5%) of total surface area
56% of the lake
species
value or sensitive species
6.8 out of 10
Widely scattered in south and southwest bays, none dense or harvestable 23 survey points with wild rice
Average Density 2.21 out of 3
253 points sampled, Maximum depth of plant growth = 7-ft, 11.5% of total surface area, only 30% of littoral zone
38% of the lake
species
6.3 out of 10
the lake
Nitella sp. Watershield
– Plant dominated – Ave. water clarity = 6-ft – Ave. Total Phosphorus = 24.6 ug/l – Ave. Chlorophyll a = 8.3 ug/l
– Algae dominated – Ave. water clarity = 3.6 ft – Ave. Total Phosphorus = 35.5 ug/l – Ave. Chlorophyll a = 18.7 ug/l
http://www.hillsborough.wateratlas.usf.edu/shared/learnmore.asp?toolsection=lm_tsi
– Top (current) TP: 26 ug/L – Bottom (historic) TP: 25 ug/L – Top: > aquatic vegetation – Bottom: < aquatic vegetation
– Top (current) TP: 80 ug/L – Bottom (historic) TP: 26 ug/L – Top: < aquatic vegetation – Bottom: > aquatic vegetation
– 59 surveys returned – Residency
– Ave. Time on Lake
– Minimum – 1 year – Maximum – 90 years
– 36 surveys returned – Residency
– Ave. Time on Lake
– Minimum – 1 year – Maximum – 84 years
– Swimming – Rest/Relaxation – Fishing – Wildlife viewing – Quiet Sports
– Split between “no changes” and “worsened” – Greatest Changes
fishing, motorized sports, and swimming
– Swimming – Fishing – Rest/Relaxation – Quiet Sports – Wildlife viewing
– Slightly “worsened” – Greatest Changes
and swimming
– Rooted vegetation, green scum, motorized boats, and use of jetskis increased – Wild rice decreased
– 55.9% would support – 18.6% would oppose
– 61% Fair, 15% Good, 20% Poor
– Green scum, use of jetskis, and noise pollution increased – Public use and garbage in the lake decreased
– 44.4% would support – 11.1% would oppose
– 28% Fair, 14% Good, 47% Poor
– Faulty septic systems – Dead and dying vegetation – Lawn runoff and shoreland erosion – Others
lake, AIS, flooding
– Faulty septic systems – Dead and dying vegetation – Others
The Lake Community generally supports removing AIS from the system, providing property improvement incentives, dredging, and update of septic systems.
– Most Support
harvesting
– Least Support
– Who Should Be Responsible?
– Most Support
– Least Support
– Who Should Be Responsible?
2010 Ceded Territory Manoomin Inventory
ERS, August 2012 SEH, August 2012
implementing aquatic plant management actions
vegetation is necessary on Amnicon
possible reestablishment of aquatic plants is necessary on Dowling
needed to help protect the lakes from future introductions
management options; at least on Amnicon
both lakes
– Possibly reestablish/introduce wild rice on Dowling
management efforts
maintain or improve water quality in both lakes
aquatic plants and aquatic invasive species
– NR 107 – It is legal to remove aquatic vegetation from the lake in an area up to 30-ft wide without a permit provided all plant material is removed from the lake – Physical removal of AIS is not restricted provided it is removed from the lake
– Of CLP in areas where wild rice will not be impacted – Of nuisance aquatic vegetation in designated navigation channels – Of access corridors between docks and open water or navigation channels
rice restoration plan in Amnicon
– Re-seeding in CLP harvesting areas
aquatic plant harvesting does not provide adequate relief
– Will require a separate “dredging” plan to be devised
monitoring and management program
– Lake level monitoring – Stream flow between lakes
improvements and best management practices
incentives program
– Design and installation of rain gardens, buffer zones, shoreland restoration, and runoff diversion projects
water quality
– Near shore and watershed runoff – Septic system survey – Internal loading