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![Page 1: Jessica Sherman Central Michigan University. Introduction Jessica Sherman B.S. in Biology and Pre-Veterinary Medicine from the University of Findlay Currently.](https://reader035.fdocuments.net/reader035/viewer/2022062417/55178e2455034645368b5565/html5/thumbnails/1.jpg)
GREAT LAKES COASTAL WETLANDS: WHAT IS A REFUGE FOR UNIONIDS?
THE EFFECTS OF WATER LEVEL FLUCTUATIONS
Jessica ShermanCentral Michigan University
![Page 2: Jessica Sherman Central Michigan University. Introduction Jessica Sherman B.S. in Biology and Pre-Veterinary Medicine from the University of Findlay Currently.](https://reader035.fdocuments.net/reader035/viewer/2022062417/55178e2455034645368b5565/html5/thumbnails/2.jpg)
Introduction
Jessica ShermanB.S. in Biology and Pre-Veterinary
Medicine from the University of FindlayCurrently at CMU for M.S. in
Conservation Biology○ Advisor: Don Uzarski○ Committee: Dave Zanatta, Daelyn
Woolnough, and Brent Murry
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Objectives
Locate refuge populations of unionids in Great Lakes coastal wetlands
Measure chemical and physical parameters
Determine if any support unionids or inhibit dreissenid colonization
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Methods
Project began in early JuneInitial set up phaseSites revisited at six and 12 weeks
Inner and outer wetland surveyedEmergent stem densities
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Grand Traverse Bay
Study Sites
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Beaver Island
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Garden Island
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The Les Cheneaux Islands
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Saginaw Bay
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Lake St. Clair Delta
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North Maumee Bay
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Methods
Water Quality MeasurementsMultiparameter Water Quality SondeWater gauges
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Water Quality MeasurementsMultiparameter Water Quality SondeWater gauges
Methods
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Methods
Dreissenid Colonization Unglazed clay tiles
○ 16x16 cm
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Unionid SurveysInitial 1 p-h visual search for live
mussels○ Staked location○ Snorkeled searches
Methods
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Unionid SurveysInitial 1 p-h visual search for live
mussels○ Staked location○ Snorkeled searches○ Except…
North Maumee Bay
Methods
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Unionid SurveysClam rake surveys
○ Haphazard starting location
Methods
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Results
Live Unionids foundLes Cheneaux Islands
○ 1 species ○ 100% fouled
Lake St. Clair Delta○ 10 species ○ 85% fouled
North Maumee Bay○ 2 species ○ 50% fouled
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North Maumee Bay
Lake St. Clair DeltaThe Les Cheneaux Islands
= Unionids present
= Unionids absent
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Results
Dreissena colonization on tiles only at Saginaw Bay and North Maumee BayHighest 20,741 and 31,007 per m2 ,
respectivelyPresent in open water of all sites studied
Saginaw Bay historically contained 13 unionid species
Ricciardi et al. 1995, Goodrich and Vander Schalie 1932
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Saginaw Bay
5,087 per m2
46 per m2
20,741 per m2
* Highest Recorded Dreissenid Colonization Outer wetland higher than inner
North Maumee Bay
0 per m2
821 per m2
31,007 per m2
Results
= No colonization = Colonization
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ResultsPhysicochemical Parameters by Region
PC 1
-6 -4 -2 0 2 4 6 8
PC
2
-6
-4
-2
0
2
4
Temperature
Conductivity
Oxygen
Turbidity
TDS
pH
Alkalinity
Water Depth
Substrate Depth
NH3
SRP
NO4
Saginaw BayLes Cheneaux IslandsBeaver IslandLake St. Clair DeltaNorth Maumee BayGarden IslandGrand Traverse Bay
ConductivityAlkalinityTDS
pH
pHTemperatureTurbidity
Water Depth
28%
18.5
%
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Results
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ResultsLow Water Level Measurements by Region
PC 1
-6 -4 -2 0 2 4 6 8
PC
2
-6
-4
-2
0
2
4Saginaw BayLes Cheneaux IslandsBeaver IslandLake St. Clair DeltaNorth Maumee BayGarden IslandGrand Traverse Bay
0-0.08 m
0.09-0.2 m
> 0.2 m
Low Water Measurements
28%
18.5
%
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ResultsWater Level Fluctuations by Region
PC 1
-6 -4 -2 0 2 4 6
PC
2
-6
-4
-2
0
2
4Saginaw BayLes Cheneaux IslandsBeaver IslandLake St. Clair DeltaNorth Maumee BayGarden IslandGrand Traverse Bay
Water Level Fluctuations
0- 0.25 m
0.25- 0.5 m
0.5- 0.75 m
0.75-1.0 m
> 1.0 m
28%
18.5
%
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Conclusions
Physicochemical variables in Saginaw Bay & North Maumee Bay appear to support Dreissena colonization
Low productivity could inhibit Dreissena colonization
No correlations between unionid populations and physicochemical factors
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Thank you!