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Impacts of Multiple Stressors on Water Quality in Saginaw Bay. Juli Dyble , Gary Fahnenstiel , Tom Nalepa , Hank Vanderploeg NOAA Great Lakes Environmental Research Lab Tom Johengen CILER Scott Peacor , Dianna Dziekan , Kim Peters Michigan State University

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Presentation Transcript

Impacts of Multiple Stressors on

Water Quality in Saginaw Bay

JuliDyble, Gary Fahnenstiel, Tom Nalepa, Hank Vanderploeg

NOAA Great Lakes Environmental Research Lab

Tom Johengen

CILER

Scott Peacor, Dianna Dziekan, Kim Peters

Michigan State University

Steve Francoeur Donna Kashian

Eastern Michigan University Wayne State University

Jim Bredin, Bruce Walker Joe Depinto

Michigan DEQ LimnoTech

Peter Lavrentyev Dave Millie

University of Akron Florida Institute of Oceanography


Samples collected
Samples collected

  • 2008

  • 3 monthly surveys (May, July, Sept)

  • 10 inner bay, 3 outer bay stations

  • 5 Master stations (surface and bottom)

  • 2009

  • 6 monthly surveys (May – Oct)

  • 10 inner bay, 3 outer bay stations, 2 water intakes

  • 5 Master stations (surface and bottom)

  • 2010

  • 6 monthly surveys (May – Oct)

  • 10 inner bay, 1 outer bay stations, 2 water intakes

  • 5 Master stations (surface and bottom)


Sampling stations

Blue: Master (5)

Red: Basic (8)

Water

utility intakes


Parameters measured
Parameters measured

  • Physical

  • CTD: temperature, conductivity, PAR, transmittance, DO

  • Secchi depth

  • Chemical

  • total P, SRP, TDP, particulate CN, DOC, NO3, NH4, SiO2, Cl

  • TSS, VSS

  • Phytoplankton

  • chla

  • phytoplankton cell counts

  • phytoplankton groups for algal pigments (HPLC)

  • Microcystis and microcystin (master stations and water intakes)

  • Zooplankton and microzooplankton

  • vertical tows w/ 64 um net (master stations)

  • oblique tows for larger bodied zooplankton (master stations)

  • whole samples in lugols and formalin (to Peter Lavrentyev)


Status of sample processing
Status of sample processing

  • Physical

  • CTD (temp, PAR, DO, Chl and PC fluorescence) – downloaded

  • Secchi depth - logged

  • Chemical

  • total P, SRP, TDP, NO3, NH4, SiO2, Cl – 2008, 2009, 2010

  • particulate CN - 2008, 2009 (2010 in process)

  • DOC – 2008, 2009, 2010

  • TSS, VSS – 2009, 2010

  • Phytoplankton

  • chla - 2008, 2009, 2010

  • phytoplankton cell counts – 2008, 2010 (2009 likely not available)

  • phytoplankton groups for algal pigments (HPLC) – not done

  • Microcystis and microcystin – (2010 in process)

  • Zooplankton and microzooplankton

  • vertical tows w/ 64 um net (master stations) – 2009 (2010 in process)

  • oblique tows for larger bodied zooplankton (master stations)

  • whole samples in lugols and formalin (to Peter Lavrentyev)


Avg surface temp 2008 2010
Avg surface temp (2008-2010)

SB20

SB10

SB5

SB14

SB2


Average yearly tp 2008 2010
Average yearly TP (2008-2010)

SB20

SB10

SB5

SB14

SB2

Driven by 2009

values

Driven by 2010

values


Average yearly chl a 2008 2010
Average yearly chla (2008-2010)

SB20

SB10

SB5

SB14

SB2

3.6 ug/L

Proposed chla resulting from 15 ug P/L in Saginaw Bay, 1979 P mgmt strategies workshop


Chl a vs tp
Chla vs TP

R2 = 0.6645

R2 = 0.4214

R2 = 0.5982


Phyto community analysis 2008 of total biovolume
Phyto community analysis – 2008(% of total biovolume)

SB20

SB10

SB5

SB14

SB5

SB2

SB14

SB2

May 08

July 08

Sept 08


Phyto community analysis 2008 of total biovolume1
Phyto community analysis – 2008(% of total biovolume)

SB20

SB10

SB5

SB20

SB14

SB10

SB2

May 08

July 08

Sept 08


Many Thanks to:

Ashley Burtner

Danna Palladino

Duane Gossiaux

Nancy Morehead

Joann Cavaletto

Dave Fanslow

Steve Constant

Lee Wyrobek

Dennis Donahue

Andrew Yagiela

Mike Taetsch

Tom Joyce

Jack Workman


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