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Impact of Deep Seawater Enrichment on Primary Production and Community Structure

This study explores the effects of deep seawater (DSW) enrichment on primary production and community structure in marine ecosystems. By conducting nutrient enrichment experiments using a mix of medium-low salinity water (MLSW) and DSW, we observed significant increases in phytoplankton biomass and primary production. Changes in population structure included the dominance of larger cells and an increase in diatom biomarkers. Our findings highlight the complex responses of marine communities to nutrient inputs and provide insights into managing oceanic resources effectively.

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Impact of Deep Seawater Enrichment on Primary Production and Community Structure

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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

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