eagle river chain of lakes aquatic invasive species...
TRANSCRIPT
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Unified Lower Eagle River Chain of Lakes Commission
Eagle River Chain of Lakes Aquatic Invasive Species Project
Informational Meeting
November 10, 2016
Eddie Heath
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Onterra, LLC Lake Management Planning
• AIS project overview
• 2016 EWM monitoring results
• Pilot hand-harvesting program on Voyageur
• Chain-wide
• 1 YAT on Cranberry & Watersmeet
• 2016 EWM Control Strategy
Outline
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AIS Project Overview • Results are reported upon – Info meeting & report
• Control strategy is developed for following year Fall/Winter
• Pretreatment Confirmation & Refinement Survey completed by Onterra
Early Spring
• Herbicide treatment conducted by third party applicator Spring
• ESAIS Survey: full-chain meander surveys completed by Onterra Late-Spring
• Survey results are made into basemaps for upload onto GPS units by Onterra
Early-summer
• Trained ERC volunteers search lakes for EWM not located during Onterra’s ESAIS Survey Summer
• Onterra re-surveys all EWM marked within the ESAIS Survey or by volunteer surveys
• Onterra conducts pre/post treatment monitoring Late-Summer
• Results are reported upon – Info meeting & report
• Control strategy is developed for following year Fall/Winter
No Herbicide Treatment in 2016
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Onterra, LLC Lake Management Planning
Evolved Control Strategy • EWM populations have been greatly reduced
• Remnant areas too small to effectively controlled using herbicides
• Below levels that cause ecological impacts or cause reductions in ecosystem services
• Maintain positive strides • ULERCLC does not want to abandon management and simply
wait for EWM populations to reach levels that are again applicable for herbicide control
• Need to balance a level of EWM population tolerance while not allowing population to return to pre-management levels
• Pilot a professional-based hand-harvesting program in 2016
• Challenges: water clarity, native plant abundance, traffic, etc.
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Onterra, LLC Lake Management Planning
Hand Removal vs. Diver-Assisted Suction Harvester (DASH)
Hand Removal
• Can be volunteer-based or contractors are available
• Used for small colonies and scattered individual plants
• Does not require a permit
DASH
• Typically used by contractors
• Used for colonies (not highly maneuverable)
• Requires mechanical harvesting permit
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Onterra, LLC Lake Management Planning
Onterra, LLC Lake Management Planning
Hand-Harvest Control & Monitoring Strategy
Spring
Summer Fall
Winter Early-Season AIS Survey (Pre- Hand-Harvest)
Professional & Volunteer Hand-Harvesting Occurs
Late-Summer EWM Peak-Biomass Survey (Post Hand-Harvest)
Re
sult
s R
ep
ort
ing
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Onterra, LLC Lake Management Planning
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2016 ESAIS Early-July
Pre-Hand-Harvest
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2016 ESAIS Early-July
Pre-Hand-Harvest
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2016 ESAIS Early-July
Pre-Hand-Harvest
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2016 ESAIS Early-July
Pre-Hand-Harvest
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2016 EWM PB Early-September
Post Hand-Harvest
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Onterra, LLC Lake Management Planning
Hand-Harvesting Conclusions • Initial results show promise
• EWM reductions in some sites
• Maintained low EWM populations in others
• Realities uncovered
• Effectiveness & selectivity
• Costs & techniques
• Side benefit is the positive public relations it brought
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Chain-wide Monitoring Results
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Onterra, LLC Lake Management Planning
Onterra, LLC Lake Management Planning
Professional AIS Mapping Point-Based Mapping • Single plants to colonies or areas less than 40-feet in
diameter
• Abundance descriptions:
Single or Few Plants
Clumps of Plants
Small Plant Colony
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Onterra, LLC Lake Management Planning
Onterra, LLC Lake Management Planning
More AIS than can be mapped using Point-based Methods
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Onterra, LLC Lake Management Planning
Onterra, LLC Lake Management Planning
Professional AIS Mapping Polygon-Based Mapping • Colonies or areas over 40-feet diameter
• Boundary at target plant extent or morphological feature (depth contour, shoreline)
• Density ratings:
Highly Scattered
Scattered
Dominant
Highly Dominant
Surface Matting
Increase in Ecological
Impact
May not represent
true colonies
or “beds”
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Onterra, LLC Lake Management Planning
EWM Colonies
0
50
100
150
200
250
300
2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
Acre
ag
e o
f M
ap
pe
d E
WM
Co
lonie
s (p
oly
go
ns)
Surface Matting
Highly Dominant
Dominant
Scattered
Highly Scattered
278.2
271.0263.2
65.7
23.4
86.492.2
72.9
12.219.7
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Onterra, LLC Lake Management Planning
EWM Colonies • 15.1 acres of colonized EWM
in Watersmeet (77%)
• 2015 Control Strategy • Target Cranberry Channel
for control, but add additional flow monitoring components to understand outcomes
• Target areas in Watersmeet that are likely to have successful outcomes (outside of main flow)
0
10
20
30
40
50
60
70
80
90
100
2012 2013 2014 2015 2016
Acre
ag
e o
f M
ap
pe
d E
WM
Co
lonie
s (p
oly
go
ns)
Yellow Birch
Duck
Lynx
Otter
Scattering Rice
Eagle
Voyageur
Catfish
Cranberry
Watersmeet
19.7
12.2
72.9
92.9
86.4
0
10
20
30
40
50
60
70
80
90
100
2012 2013 2014 2015 2016
Acre
ag
e o
f M
ap
pe
d E
WM
Co
lonie
s (p
oly
go
ns)
Yellow Birch
Duck
Lynx
Otter
Scattering Rice
Eagle
Voyageur
Catfish
Cranberry
Watersmeet
19.7
12.2
72.9
92.9
86.4
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Onterra, LLC Lake Management Planning
EWM Colonies
0
10
20
30
40
50
60
70
80
90
100
2012 2013 2014 2015 2016
Acre
ag
e o
f M
ap
pe
d E
WM
Co
lonie
s (p
oly
go
ns)
Yellow Birch
Duck
Lynx
Otter
Scattering Rice
Eagle
Voyageur
Catfish
Cranberry
Watersmeet
19.7
12.2
72.9
92.9
86.4
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2014 EWM PB Early-September
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2015 EWM PB Early-September
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2016 EWM PB Early-September
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2014 EWM PB Early-September
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2015 EWM PB Early-September
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2016 EWM PB Early-September
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Onterra, LLC Lake Management Planning
Overall, Significant Reduction of EWM • 2007 – 278 acres of EWM colonies mapped, most of which were
dominant or greater
• 2016 – < 20 acres of EWM colonies mapped, all but 1.8 acres is > scattered
No Herbicide Treatment Proposed AGAIN for 2017 • Working criteria: colonized areas where a sufficiently large treatment
area can be constructed to hold CETs (preference to dominant or greater density)
• Based on the ESAIS Survey (early July), professional hand-harvesting areas would be constructed
Important to Continue to Improve the ERC • Ongoing Management Planning effort developing protection &
enhancement goals
• Navigate additional science, changing technologies, and new regulations
AIS Project Conclusions