lower trophic levels and alewife in onondaga lake 2011
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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Lower trophic levels and alewifein Onondaga Lake 2011
Presentation for OLTAC meeting Halloween 2012
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Phytoplankton in 2011
Cyclotella
Synedra
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Bluegreens 2011
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Biovolume 1998-2011
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Phytoplankton 1998-2011
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N:P ratio
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Daphnia
Cyclopoid
Calanoids
Copepods
Zooplankton
Bosmina
Cladocerans
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Zooplankton in 2011
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Zooplankton size in 2009-11
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Zooplankton average length
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Alewife
Daphnia
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Alewife
Cascading interactions in the food chain
Algae
Zooplankton
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2010 – 60% from the 2009 year class2011 - 74% from the 2009 year class 26% from the 2010 year class 2012 28% 2009, 13% 2010, 52% 2012
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Water Quality Effects
• Smaller zooplankton
• “Top-down” trophic cascades: increasing algae
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Secchi 2008-20122008 2009 2010 2011 2012
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Density # /m2
• Oneida 1995 – 2009: 6300 (3600 – 9400)
• Onondaga 2007 – 2011: 13000-18000
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Comparison with lake-wide biomass Oneida - Onondaga
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Comparison with lake-wide biomass Oneida - Onondaga
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Alewife
Trophic Cascades 2008 - 2011
Algae and Water Clarity
Nutrients
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Winter MortalityChamplain January 2008
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Thank You