1 / 10

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. Karin Bj örkman , PhD OTEC/SWAC meeting 16 September 2011. Nutrient enrichment experiments. µmol SRP kg -1. DSW. CONTROL : MLSW (30 m ) TREATMENT : MLSW + DSW (5% v/v ) ~ 2 µmol L -1 N+N.

alyson
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related