Wisconsin Lakes
Convention
Coordinating and Evaluating a
Successful AIS Control Project
March 31, 2010
Tim Hoyman & Eddie Heath
Presentation Outline
• AIS Monitoring & Treatment Planning
• Not for nuisance control projects
• Intended for ecosystem restoration
• Example Case Studies
• Eagle River Chain of Lakes, Vilas County
• Mt. Morris Lake, Waushara County
Onterra
,
Lake Management Planning
EWM: mid July – mid Sept.
CLP: mid June – early July
Peak
Biomass
Survey
Treatment Results:
Decreased density
Decreased area
Treatment
Occurs
Verify & refine
treatment areas
Onterra
,
Lake Management Planning
Annual Assessments:
Qualitative - Density ratings
Quantitative - Point-intercept
sub-sampling
Annual
Monitoring
& Treatment
Cycle
Spring
Pretreatment
Survey
Tune treatment
strategy
Create
Treatment
Strategy
Treatment area creation
& obtain conditional
permit
Eagle River Chain of Lakes
Project Overview
• Completion of Lake Management
Planning activities during 2007
• 3-year control plan of EWM using
herbicides (2008-2010)
• Volunteer EWM Surveys
• Pre- & post treatment monitoring
Onterra
LLC
Lake Management Planning
,
Volunteer EWM Surveys
• Initial training by Onterra staff – 2007
• Identification
• GPS & note taking
• Data transfer
• Refresher course – 2008
Onterra
LLC
Lake Management Planning
,
Volunteer EWM Surveys
• Divide responsibility, mark EWM
occurrences on chain
• Onterra visits locations and accurately
maps areas to set up treatments
Eagle River Chain
10 Lakes, 2 River Sections
62 miles of Shoreline
3,500 acres
Onterra
LLC
Lake Management Planning
,
2007 EWM Peak Biomass Survey
2008 EWM Peak Biomass Survey
2008 EWM Peak Biomass Survey
2009 Treatment Areas
2008 EWM Peak Biomass Survey
2009 Treatment Areas
2009 Treatment Areas
2009 EWM Peak Biomass Survey
Summer 2008 EWM Surveys
Summer 2009 EWM Surveys
Acres of EWM by Density Rating
160.0
143
140.0
2008 Acres (Total: 270)
2009 Acres (Total: 263)
120.0
99
100.0
80.0
72
74
60
60.0
40.0
31
24
17
20.0
13
0
0.0
Highly Scattered
Scattered
Dominant
Highly Dominant
Surface Matting
All
(N=774)
Yellow Birch
(N=115)
Watersmeet
(N=165)
Voyageur
(N=4)
Scattering Rice
(N=177)
Otter
(N=21)
Lynx
(N=14)
Post-treatment 08/09
Eagle
(N=42)
Duck
(N=16)
Cranberry
(N=134)
Catfish
(N=86)
EWM Percent Occurrence in Point-intercept Locations
100.0
EWM Occurrence in Point-intercept Locations
Pre-treatment 08/08
Faded Bars are not Statistically Significant (p<0.05)
90.0
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
Wild celery
Water stargrass
Vasey's pondweed
Variable pondweed
Stoneworts
Small pondweed
Slender naiad
Ribbon-leaf pondweed
Pickerelweed
Lesser duckweed
Leafy pondweed
Large-leaf pondweed
Illinois pondweed
Fries' pondweed
Forked duckweed
Floating-leaf bur-reed
Flat-stem pondweed
Fern pondweed
Common waterweed
Dicots
Common bur-reed
Clasping-leaf pondweed
White water lily
Watershield
Water marigold
Spatterdock
Northern water milfoil
Coontail
Common bladderwort
Change in Percent Frequency
30
EWM Occurrence in Point-intercept Locations
25
Statistically Signif icant (p < 0.05)
20
Not Statistically Signif icant ( p > 0.05)
15
10
5
0
-5
-10
-15
-20
-25
Monocots and Macroalgae
-30
ERC Control Project Results
Through 2009
Treatment Monitoring (2009)
• 65% decline in EWM occurrence (46.0% in 2008 to 16.3%
in 2009)
• Similar acreage of EWM mapped, but shift towards
reduced density
Volunteer Data
• Most areas of chain were surveyed
• Data was very good and timely
Other ULERCLC Efforts
• Hand Removal
• Vilas County website
• CBCW volunteer coordinator
Onterra
LLC
Lake Management Planning
,
Mt. Morris Lake
Project Overview
• Completion of Lake Management
Planning activities during winter 2005-06
• 4-year control plan of CLP using
herbicides (2006-2009)
• Pre- & Post Treatment Monitoring
• Point-intercept sub-sampling
• Dredge sampling for turions
Onterra
LLC
Lake Management Planning
,
Curly-leaf Pondweed Life Cycle
Onterra
LLC
Lake Management Planning
,
2006 Original Treatment Plan
2006 Original Treatment Plan
2006 Modified Treatment Plan
31.6 Acres
2007 Treatment Plan
27.1 Acres
2008 Treatment Plan
28.6 Acres
2009 Treatment Plan
28.6 Acres
Monitoring Program
Point-intercept sub-sampling
• Collected previous to herbicide application
(April-May)
• Compare to following spring
Onterra
LLC
Lake Management Planning
,
Curly-leaf Pondweed Occurrence
70%
CLP Percent Occurrence in Point-Intercept Locations
60%
50%
40%
30%
20%
10%
0%
Onterra
LLC
Lake Management Planning
,
Curly-leaf Pondweed Occurrence
70%
60%
CLP Percent Occurrence in Point-Intercept Locations
56.8%
50%
40%
30%
20%
10%
0%
2006
(N=118)
Onterra
LLC
Lake Management Planning
,
Curly-leaf Pondweed Occurrence
70%
60%
CLP Percent Occurrence in Point-Intercept Locations
56.8%
50%
40%
36.4%
Significant
Decrease
30%
20%
10%
0%
2006
(N=118)
Onterra
LLC
Lake Management Planning
,
2007
(N=118)
Curly-leaf Pondweed Occurrence
70%
60%
CLP Percent Occurrence in Point-Intercept Locations
56.8%
50%
40%
36.4%
Significant
Decrease
30%
20%
16.1%
Significant
Decrease
10%
0%
2006
(N=118)
Onterra
LLC
Lake Management Planning
,
2007
(N=118)
2008
(N=118)
Curly-leaf Pondweed Occurrence
70%
Significant Decrease
60%
CLP Percent Occurrence in Point-Intercept Locations
56.8%
50%
40%
36.4%
Significant
Decrease
30%
20%
16.1%
Significant
Decrease
10%
Significant
Decrease
4.2%
0%
2006
(N=118)
Onterra
LLC
Lake Management Planning
,
2007
(N=118)
2008
(N=118)
2009
(N=118)
Monitoring Program
Dredge sampling for turions
• Following treatment (summer) using same
sampling locations
• Compare to following summer
Onterra
LLC
Lake Management Planning
,
Curly-leaf Turion Sampling
30.0
25.0
Turion % Prevalence
20.0
15.0
Year
2006
2007
2008
2009
10.0
5.0
Total
102
135
116
66
% Prevalence
25.0
23.2
22.9
16.9
Average
0.9
1.2
1.0
0.6
Range
1-14
1-23
1-21
1-18
0.0
2006
Onterra
LLC
Lake Management Planning
,
2007
2008
2009
Mt. Morris Control Project Results
Point-intercept sub-sampling
• 65% decline in CLP occurrence (58.6% in 2006
to 4.2% in 2009)
Turion dredge sampling
• Reductions observed in 2009
• Limitations of technique?
Update Lake Management Plan
• Successfully received WDNR Lake Planning
Grants during February 2010 cycle
• Replicate 2006 surveys for comparisons
Onterra
LLC
Lake Management Planning
,
Tim Hoyman & Eddie Heath – Onterra, LLC