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Mesozooplankton component

Mesozooplankton component. General objective : Quantitative assessment of its biomass and production and its impacts on phytoplankton stocks and vertical matter flux. Approaches :

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Mesozooplankton component

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  1. Mesozooplankton component • General objective: Quantitative assessment of its biomass and production and its impacts on phytoplankton stocks and vertical matter flux. • Approaches: • 1. The biomass (as organic carbon and nitrogen) determined by combination on size structure (estimates based on OPC/ZOOSCAN measurements)* and direct determination of carbon and nitrogen contents(with CHN)* in mesozooplankton fractions. • 2. The samples for description of zooplankton communities*. • 3. Complementary process studies to estimate biological rates (details to be discussed during this meeting **) and fluxes through the compartment. • - Egg production experiments* • - Others • *: Innovative approach • *: Classical approach

  2. Details ►Sampling 1. - Bongo net tows for samples Standard: Depth from 200 m to the surface Alternatives: - Depth defined in real time observation from size particles distribution UVP (to be discussed). - Open-close nets 2. - Net tows for living organisms

  3. ►Processing on board: • 1. Collected samples • Conditioning samples for preservation • Conditioning samples for weighting C/N: filtrations • 2. Collected living organisms • 24 h Egg production experiments

  4. ►Measurement Lab OPC/ZOOSCAN: Fine resolution if the size-structured biomass Binocular: Faunistic distributions Counting from egg experiments

  5. ►Objectives : 1. Quantify mesozooplankton biomass (200 µm-2000 µm) based on a fine resolution of its size structure using OPC and ZOOSCAN, and CHN weighting. Deliverables -         Total biomass -         Size-fraction biomasses (200-300 µm;300-500 µm;500-1000 µm; >1000 µm) from OPC/ZOOSCAN and from CHN on similar size fraction -         Fine size-distribution of biomass from OPC and binocular: define main contributors

  6. ►Objectives (suite): 2. Description of zooplankton communities Deliverables -         Taxonomic tables per station -         Identification of main contributors on size spectra 3. Derived index of zooplankton production with the slope of the biomass size spectrum Deliverables -         Index of production -         Derived fluxes as allometric relationship to weight: Respiration of planktonic communities by the use of biomass spectra and allometric relations

  7. ►Objectives (suite): 4. Estimate zooplankton production from classical method: egg production of copepods Deliverable: Egg production per female Egg production per biomass fraction – Secondary production

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