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P rimary p roduction and c ommunity structure response to deep seawater enrichment

P rimary p roduction and c ommunity structure response to deep seawater enrichment

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P rimary p roduction and c ommunity structure response to deep seawater enrichment

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  1. Primary production and community structure response to deep seawater enrichment Karin Björkman, PhD OTEC/SWAC meeting 16 September 2011

  2. Nutrient enrichment experiments µmol SRP kg-1 DSW CONTROL: MLSW (30 m) TREATMENT: MLSW+ DSW (5% v/v) ~ 2 µmol L-1 N+N Depth (m) Mahaffey et al. in review

  3. Nutrient enrichment experiments Incubated on deck Sampled approx daily for 4-5 days CONTROL: MLSW (30 m) TREATMENT: MLSW + DSW (5% v/v) ~ 2 µmol L-1 N+N Samples: Nutrients (N, P, Si) Pigments Rate measurements: Primary production (14C) Mahaffey et al. inreview

  4. Chlorophyll a – size fractionated distribution CONTROL Chl a (µg l-1) Month

  5. Chlorophyll a – size fractionated distribution Scale ! CONTROL Treatment 5% DSW Chl a (µg l-1) Month Month

  6. Primary production – size fractionated distribution CONTROL PP (µg C l-1 d-1) Month

  7. Primary production – size fractionated distribution Scale ! CONTROL Treatment 5% DSW PP (µg C l-1 d-1) Month Month

  8. Community structure- Diagnostic pigments CONTROL ng L-1 Month

  9. Community structure- Diagnostic pigments Scale! CONTROL Treatment 5% DSW ng L-1 Month Month

  10. General Results • Always increases in phytoplankton biomass (chlorophyll) • Always increases of primary production • Population structure changed • Larger cells • Diatom biomarkers up • Variable – • Magnitude in response • Dominant phytoplankton group