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Impacts of Multiple Stressors on Water Quality in Saginaw Bay

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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Impacts of Multiple Stressors on Water Quality in Saginaw Bay

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  1. 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

  2. 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)

  3. Sampling stations Blue: Master (5) Red: Basic (8) Water utility intakes

  4. 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)

  5. 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)

  6. Avg surface temp (2008-2010) SB20 SB10 SB5 SB14 SB2

  7. Average yearly TP (2008-2010) SB20 SB10 SB5 SB14 SB2 Driven by 2009 values Driven by 2010 values

  8. 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

  9. Chla vs TP R2 = 0.6645 R2 = 0.4214 R2 = 0.5982

  10. Phyto community analysis – 2008(% of total biovolume) SB20 SB10 SB5 SB14 SB5 SB2 SB14 SB2 May 08 July 08 Sept 08

  11. Phyto community analysis – 2008(% of total biovolume) SB20 SB10 SB5 SB20 SB14 SB10 SB2 May 08 July 08 Sept 08

  12. 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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