RRS Challenger CH13
Cruise summary report
|Ship name (ship code)||RRS Challenger (74CH)|
|Cruise period||1987-03-29 — 1987-04-19|
|Port of departure||Barry, United Kingdom|
|Port of return||Barry, United Kingdom|
|Objectives||1. To determine size fractioned rates of phytoplankton production in different light regimes and bacterial production - to relate these to the production and flux of organic matter by various components of the pelagic ecosystem.
2. To relate primary production, phytoplankton biomass and species composition to the vertical structure, behaviour and feeding of the herbivorous zooplankton; to determine the availability of suitable phytoplankton as a diet for first-feeding larvae.
3. To determine the horizontal and vertical distribution of zooplankton including fish eggs and larvae, in relation to hydrographic conditions and the availability of suitable food for fish larvae.
4. To determine the dissolved free amino acids, vitamins and polyunsaturated fatty acids present in various zooplankton species and their developmental stages and in fish larvae and eggs; larvae of sprat will be collected for determination of RNA/DNA and histology.
|Chief scientist||Bob Williams (Institute of Marine Environmental Research, Plymouth)|
|Cruise report||(0.42 MB)|
|General||Irish Sea and St. George's Channel|
|Surface measurements underway (T,S)|
|CTD stations||Quantity: number of profiles = 176|
|Subsurface temperature and salinity measurements|
|Optics (eg underwater light levels)||Quantity: number of profiles = 10|
|Biology and fisheries|
|Primary productivity||Quantity: number of experiments = 11|
|Phytoplankton pigs (eg chlorophyll, fluorescence)||Quantity: number of samples = 200|
|Particulate organic matter (inc POC, PON)||Quantity: number of samples = 200|
|Biochemical measurements (eg lipids, amino acids)||Quantity: number of samples = 200|
|Zooplankton||Quantity: number of samples = 450|
Description: survey:distribution,biomass determination,energy transfers,population studies
|Eggs and larvae||Quantity: number of samples = 200|
|Pelagic bacteria/micro-organisms||Quantity: number of stations = 11|
|Other biological/fisheries measurement||Quantity: number of samples = 100|
Description: vitamin concentrations