To measure the impact that the common herbivorous copepod Calanus helgolandicus makes on the level of primary production on shelf seas and to ascertain the flow of carbon through this secondary trophic level.
1) To measure in situ primary production and light in the water column at Station CS2.
2) To measure the abundance and vertical distribution of phytoplankton, bacteria and flagellates.
3) To measure the release of dissolved organic matter by phytoplankton and the concomitant uptake by bacteria.
4) To partition primary production into different size classes of phytoplankton.
5) To determine the vertical distribution, abundance and diel migration of all development stages of Calanus helgolandicus (eggs - adult).
6) To obtain living material for length/dry weight, gut contents, carbon, nitrogen, ash content, calorific value and lipid reserve.
7) To measure the feeding rate (ingestion) of Calanus on natural particulates from three selected depth strata under simulated ambient conditions.
8) To measure the assimilation rate and absorption efficiency by Calanus using radioactive tracer and gut enzyme analysis techniques.
9) To ascertain the horizontal and vertical structure of the biological and physical environment around CS2.
10) To measure primary production at selected Stations along the Plymouth to Roscoff UOR (PR) route.
11) To contribute towards a seasonal study of phytoplankton and zooplankton at Station A1.
Bob Williams (Institute of Marine Environmental Research, Plymouth)
English Channel Celtic Sea
Station CS2 (50.5N, 7W)
Surface measurements underway (T,S)
Quantity: number of profiles = 19 Description: XBT
Water bottle stations
Quantity: number of profiles = 34 Description: T surface 7 S surface