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Lower trophic levels and alewife in Onondaga Lake 2011

Lower trophic levels and alewife in Onondaga Lake 2011 Presentation for OLTAC meeting Halloween 2012. Phytoplankton in 2011. Synedra. Cyclotella. Bluegreens 2011. Biovolume 1998-2011. Phytoplankton 1998-2011. N:P ratio. Zooplankton. Daphnia. Calanoids. Cladocerans. Copepods. Bosmina.

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Lower trophic levels and alewife in Onondaga Lake 2011

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  1. Lower trophic levels and alewife in Onondaga Lake 2011 Presentation for OLTAC meeting Halloween 2012

  2. Phytoplankton in 2011 Synedra Cyclotella

  3. Bluegreens 2011

  4. Biovolume 1998-2011

  5. Phytoplankton 1998-2011

  6. N:P ratio

  7. Zooplankton Daphnia Calanoids Cladocerans Copepods Bosmina Cyclopoid

  8. Zooplankton in 2011

  9. Zooplankton size in 2009-11

  10. Zooplankton average length

  11. Alewife Daphnia

  12. Cascading interactions in the food chain Alewife Zooplankton Algae

  13. 2010 – 60% from the 2009 year class 2011 - 74% from the 2009 year class 26% from the 2010 year class 2012 28% 2009, 13% 2010, 52% 2012

  14. Water Quality Effects • Smaller zooplankton • “Top-down” trophic cascades: increasing algae

  15. Secchi 2008-2012 2008 2009 2010 2011 2012

  16. Density # /m2 • Oneida 1995 – 2009: 6300 (3600 – 9400) • Onondaga 2007 – 2011: 13000-18000

  17. Comparison with lake-wide biomass Oneida - Onondaga

  18. Comparison with lake-wide biomass Oneida - Onondaga

  19. Trophic Cascades 2008 - 2011 Alewife Algae and Water Clarity Nutrients

  20. Winter Mortality Champlain January 2008

  21. Thank You

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