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Mortality of waterbirds in the Upper Mississippi River. Jennifer Sauer; USGS — La Crosse, Wisconsin Dr. Rebecca Cole; USGS—Madison, Wisconsin Dr. Greg Sandland, UW-La Crosse Dr. Roger Haro, UW-La Crosse Jim Nissen; USFWS La Crosse District Ed Britton; USFWS Savanna District. - PowerPoint PPT Presentation
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Upper Midwest Environmental Sciences Center
Mortality of waterbirds Mortality of waterbirds in the in the
Upper Mississippi RiverUpper Mississippi River
Mortality of waterbirds Mortality of waterbirds in the in the
Upper Mississippi RiverUpper Mississippi River
Jennifer Sauer; USGS—La Crosse, WisconsinDr. Rebecca Cole; USGS—Madison, WisconsinDr. Greg Sandland, UW-La CrosseDr. Roger Haro, UW-La CrosseJim Nissen; USFWS La Crosse DistrictEd Britton; USFWS Savanna District
Jennifer Sauer; USGS—La Crosse, WisconsinDr. Rebecca Cole; USGS—Madison, WisconsinDr. Greg Sandland, UW-La CrosseDr. Roger Haro, UW-La CrosseJim Nissen; USFWS La Crosse DistrictEd Britton; USFWS Savanna District
Upper Midwest Environmental Sciences Center
Upper Midwest Environmental Sciences Center
Waterbird MortalitiesWaterbird Mortalities
Upper Midwest Environmental Sciences Center
Mortality EventsMortality Events
19982006-81992
1996-P
2002-P
2007
2001-4
Upper Midwest Environmental Sciences Center
Upper Midwest Environmental Sciences Center
Bithynia tentaculataBithynia tentaculata
Upper Midwest Environmental Sciences Center
Cyathocotyle bushiensis (Coots)Cyathocotyle bushiensis (Coots)Sphaeridiotrema globulus (Scaup, Coots)Sphaeridiotrema globulus (Scaup, Coots)Leyogonimus polyoon (Coots)Leyogonimus polyoon (Coots)
Upper Midwest Environmental Sciences Center
PathologyPathology
SphaeridiotremaSphaeridiotrema– reside in the small intestinereside in the small intestine– feed on blood, causing severe blood loss and feed on blood, causing severe blood loss and
anemiaanemia CyathocotyleCyathocotyle
– reside in the cecareside in the ceca– cause a disruption in water and electrolyte balancecause a disruption in water and electrolyte balance
Leyogonimus polyoonLeyogonimus polyoon– infects primarily the upper and middle areas
of the small intestine. – severe enteritis characterized by thickening
of the intestinal wall that blocks the lumen of the intestine
Upper Midwest Environmental Sciences Center
Why are we concerned?Why are we concerned?
Upper Midwest Environmental Sciences Center
Why are we concerned?Why are we concerned?
Upper Midwest Environmental Sciences Center
Total Mortality EstimatesTotal Mortality Estimates
16,420 - 20,79516,420 - 20,79526,840 - 34,140 26,840 - 34,140 Total (Spring & Fall)Total (Spring & Fall)10,500 -13,000 10,500 -13,000 2,100 - 2,700 2,100 - 2,700 Fall 2007Fall 20073,700 - 5,0003,700 - 5,0003,700 - 5,0003,700 - 5,000Fall 2006Fall 2006150 - 200150 - 2005,300 - 7,0005,300 - 7,000Fall 2005Fall 200510-1510-152,100 - 2,600 2,100 - 2,600 Fall 2004Fall 2004
6,100 - 7,6006,100 - 7,600Fall 2003Fall 200350 - 6550 - 65580 - 700580 - 700Fall 2002Fall 2002
Pool 8Pool 8Pool 7Pool 7
Upper Midwest Environmental Sciences Center
Synopsis of on-going workSynopsis of on-going work
Upper Midwest Environmental Sciences Center
Lake Onalaska—2005 & 2007Lake Onalaska—2005 & 2007NWHC leadNWHC leadLake Onalaska—2005 & 2007Lake Onalaska—2005 & 2007NWHC leadNWHC lead
Upper Midwest Environmental Sciences Center
Prevalence of InfectionPrevalence of Infection
Overall prevalence for parasites at all sites Overall prevalence for parasites at all sites across entire season was 70.75%across entire season was 70.75%
Highest prevalence for a parasite was in August Highest prevalence for a parasite was in August 83.1%83.1%
Lowest prevalence for a parasite was in May Lowest prevalence for a parasite was in May 54.1%54.1%
Upper Midwest Environmental Sciences Center
Treatments
C = ControlT1 = GravelT2 = Gravel/sand mix
T2
T1
C
C
T1
T2
3 areas at ~90 feet
6 areas at 110 feet
C
T1
T2
2006 & 2007 Management study2006 & 2007 Management study2006 & 2007 Management study2006 & 2007 Management study
Upper Midwest Environmental Sciences Center
MonitoringMonitoringMonitoringMonitoring
Infected snails found in every pool sampled
Upper Midwest Environmental Sciences Center
Pool 8
2007 Vegetation and Snail Sampling2007 Vegetation and Snail Sampling2007 Vegetation and Snail Sampling2007 Vegetation and Snail Sampling
Pool 131 – 5
6-100
>100 <1000
>1000
Pool 8
Upper Midwest Environmental Sciences Center
Example of sampling protocol
Site 1Site 2
X 2X 2
30 cm 60 cmABA B
N
Cobble assessment
2008—Pools 7 and 8 study2008—Pools 7 and 8 study2008—Pools 7 and 8 study2008—Pools 7 and 8 study
Upper Midwest Environmental Sciences Center
Snail comparisons between poolsSnail comparisons between pools
BithyniaAmnicolaPhysaOther
Pool 7 Pool 8
Upper Midwest Environmental Sciences Center
Snail samples by transectGroup average
E1-
E-A
CB
I-N-B
CB
I-N-A
CB
I-S-A
CB
I-S-B
N1-
S-B
N1-
S-A
CO
-E-A
CO
-E-B
AH
-E-A
AH
-E-B
BG
-E-B
CO
-W-A
AH
-W-A
AH
-W-B
CO
-W-B
RO
-N-B
E1-
E-B
RO
-S-A
RO
-S-B
RO
-N-A
TI-S
-BE
1-W
-AT
I-S-A
BG
-E-A
E1-
W-B
N1-
N-A
N1-
N-B
BG
-W-A
BG
-W-B
TI-N
-AT
I-N-B
Samples
100
80
60
40
Sim
ilarit
y
Transform: Square rootResemblance: S17 Bray Curtis similarity
Upper Midwest Environmental Sciences Center
0
1
2
3
4
5
6
7
8
9
0 10 20 30 40
Mean host density
Me
an
ab
un
da
nc
eR2 = 0.88; P = 0.014
Infection RatesInfection Rates
Upper Midwest Environmental Sciences Center
Documented exotic infection patterns Documented exotic infection patterns
B. tentaculata
C. bushiensis
S. globulus
L. polyoon
After this summer, additional hosts identified:After this summer, additional hosts identified:
C. bushiensis
S. globulus
L. polyoon
Amnicola
Campeloma
Upper Midwest Environmental Sciences Center
C. bushiensis abundance – Pool 7C. bushiensis abundance – Pool 7
0
2
4
6
8
10
12
AH-East AH-West BG-East BG-West CO-East CO-West RO-North RO-South
Site
Me
an
C. b
us
hie
ns
is a
bu
nd
an
ce Amnicola
Bithynia
Upper Midwest Environmental Sciences Center
C. bushiensis abundance – Pool 8C. bushiensis abundance – Pool 8
0
2
4
6
8
10
12
E1-East E1-West CBI-North CBI-South T1-North T1-South N1-North N1-South
Site
Me
an
C. b
us
hie
ns
is a
bu
nd
an
ce
AmnicolaBithynia
Upper Midwest Environmental Sciences Center
0
0.2
0.4
0.6
0.8
1
Bt Pg Le Ht
Snail species
Pro
po
rtio
n i
nfe
cted
(ec
hin
ost
om
e)
0
0.2
0.4
0.6
0.8
1
Bt Pg Le Ht
Snail species
Pro
po
rtio
n in
fect
ed (
S. g
lob
ulu
s)
Experimental exposuresExperimental exposures
Conclusion: Conclusion: BithyniaBithynia does not appear to be as does not appear to be as susceptible to NATIVE parasite species as susceptible to NATIVE parasite species as native snail speciesnative snail species
Upper Midwest Environmental Sciences Center
Management Management Strategies Strategies
Molluscacide; Molluscacide;
Decrease rip rap (rocks)Decrease rip rap (rocks)
Harvest submersed vegetationHarvest submersed vegetation
Harass birds??Harass birds??
Cover rip-rapCover rip-rap
Modify island designModify island design
Pick up dead birdsPick up dead birds
X
XX
XX