coordinating and evaluating a successful ais control … · coordinating and evaluating a...

Wisconsin LakesConvention

Tim Hoyman & Eddie Heath

Coordinating and Evaluating a

Successful AIS Control ProjectMarch 31, 2010

•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

Presentation Outline

Onterra,

LLCLake Management Planning

Onterra,

LLCLake Management Planning

PeakBiomassSurvey

CreateTreatment Strategy

TreatmentOccurs

Annual Assessments:

Qualitative

Quantitative

SpringPretreatment

Survey

Treatment area creation& obtain conditional

permit

EWM: mid July – mid Sept.CLP: mid June – early July

- Density ratings- Point-intercept sub-sampling

Annual Monitoring

& Treatment Cycle

Annual Monitoring

& Treatment Cycle

Verify & refine treatment areas

Tune treatment strategy

Treatment Results:Decreased density

Decreased area

Onterra, LLCLake Management PlanningOnterra, LLCLake Management Planning

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


Volunteer EWM Surveys• Initial training by Onterra staff – 2007

• Identification

• GPS & note taking

• Data transfer

• Refresher course – 2008


Volunteer EWM Surveys• Divide responsibility, mark EWM

occurrences on chain

• Onterra visits locations and accurately maps areas to set up treatments

Eagle River Chain10 Lakes, 2 River Sections

62 miles of Shoreline3,500 acres

2007 EWM Peak Biomass Survey


2009 Treatment Areas

Summer 2008 EWM Surveys

Summer 2009 EWM Surveys

24

74

99

60

13

72

143

31

17

00.0

20.0

40.0

60.0

80.0

100.0

120.0

140.0

160.0

Highly Scattered Scattered Dominant Highly Dominant Surface Matting

2008 Acres (Total: 270)

2009 Acres (Total: 263)

Acres of EWM by Density Rating

0.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

100.0

Catf

ish

(N

=86)

Cra

nb

err

y

(N=

134)

Du

ck

(N=

16)

Eag

le

(N=

42)

Lyn

x

(N=

14)

Ott

er

(N=

21)

Scatt

eri

ng

Ric

e

(N=

177)

Vo

yag

eu

r (N

=4)

Wate

rsm

eet

(N=

165)

Yello

w B

irch

(N

=115)

All

(N=

774)

EW

M P

erc

en

t O

cc

urr

en

ce

in

Po

int-

inte

rce

pt

Lo

ca

tio

ns

Pre-treatment 08/08

Post-treatment 08/09Faded Bars are not Statistically Significant (p<0.05)

EWM Occurrence in Point-intercept Locations

-30

-25

-20

-15

-10

-5

0

5

10

15

20

25

30

Co

mm

on

bla

dd

erw

ort

Co

on

tail

No

rth

ern

wate

r m

ilfo

il

Sp

att

erd

ock

Wate

r m

ari

go

ld

Wate

rsh

ield

Wh

ite w

ate

r li

ly

Cla

sp

ing

-leaf

po

nd

weed

Co

mm

on

bu

r-re

ed

Co

mm

on

wate

rweed

Fern

po

nd

weed

Fla

t-ste

m p

on

dw

eed

Flo

ati

ng

-leaf

bu

r-re

ed

Fo

rked

du

ckw

eed

Fri

es' p

on

dw

eed

Illi

no

is p

on

dw

eed

Larg

e-l

eaf

po

nd

weed

Leafy

po

nd

weed

Lesser

du

ckw

eed

Pic

kere

lweed

Rib

bo

n-l

eaf

po

nd

weed

Sle

nd

er

naia

d

Sm

all

po

nd

weed

Sto

new

ort

s

Vari

ab

le p

on

dw

eed

Vasey's

po

nd

weed

Wate

r sta

rgra

ss

Wil

d c

ele

ry

Ch

an

ge

in P

erc

en

t F

req

ue

nc

y

Statistically Signif icant (p < 0.05)

Not Statistically Signif icant ( p > 0.05)

Dicots Monocots and Macroalgae

EWM Occurrence in Point-intercept Locations


ERC Control Project ResultsThrough 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


Mt. Morris LakeProject 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, LLCLake Management Planning

Curly-leaf Pondweed Life Cycle

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 ProgramPoint-intercept sub-sampling

• Collected previous to herbicide application (April-May)

• Compare to following spring


0%

10%

20%

30%

40%

50%

60%

70%C

LP

Perc

en

t O

ccu

rren

ce in

Po

int-

Inte

rcep

t L

ocati

on

sCurly-leaf Pondweed Occurrence


56.8%

0%

10%

20%

30%

40%

50%

60%

70%

2006(N=118)

CL

P P

erc

en

t O

ccu

rren

ce in

Po

int-

Inte

rcep

t L

ocati

on

sCurly-leaf Pondweed Occurrence


56.8%

36.4%

0%

10%

20%

30%

40%

50%

60%

70%

2006(N=118)

2007(N=118)

CL

P P

erc

en

t O

ccu

rren

ce in

Po

int-

Inte

rcep

t L

ocati

on

s

Significant

Decrease

Curly-leaf Pondweed Occurrence


56.8%

36.4%

16.1%

0%

10%

20%

30%

40%

50%

60%

70%

2006(N=118)

2007(N=118)

2008(N=118)

CL

P P

erc

en

t O

ccu

rren

ce in

Po

int-

Inte

rcep

t L

ocati

on

s

Significant

Decrease

Significant

Decrease



56.8%

36.4%

16.1%

4.2%

0%

10%

20%

30%

40%

50%

60%

70%

2006(N=118)

2007(N=118)

2008(N=118)

2009(N=118)

CL

P P

erc

en

t O

ccu

rren

ce in

Po

int-

Inte

rcep

t L

ocati

on

s

Significant

Decrease

Significant

Decrease

Significant

Decrease

Significant Decrease



Monitoring ProgramDredge sampling for turions

• Following treatment (summer) using same sampling locations

• Compare to following summer


Curly-leaf Turion Sampling

0.0

5.0

10.0

15.0

20.0

25.0

30.0

2006 2007 2008 2009

Tu

rio

n %

Pre

vale

nce

Year Total % Prevalence Average Range

2006 102 25.0 0.9 1-14

2007 135 23.2 1.2 1-23

2008 116 22.9 1.0 1-21

2009 66 16.9 0.6 1-18


Mt. Morris Control Project ResultsPoint-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

Tim Hoyman & Eddie Heath – Onterra, LLC

coordinating and evaluating a successful ais control … · coordinating and evaluating a...

Documents