RV Cefas Endeavour 14/05
Cruise summary report
|Ship name (ship code)||RV Cefas Endeavour (74E9)|
|Cruise period||2005-09-29 — 2005-10-04|
|Port of departure||Lowestoft, United Kingdom|
|Port of return||Lowestoft, United Kingdom|
|Objectives||This was the fourth of five related cruises to the Silver Pit, central North Sea in 2005 to describe the effects of fishing and the environment on production and food web structure during a seasonal production cycle. The data collected will be used to parameterise size-based food web models and to describe how seasonal patterns of energy flow affect indicators of fisheries impacts on trophic structure, biomass and production. The specific objectives of the cruise were:
1. To collect samples to allow analysis of spatial and temporal variation in carbon and nitrogen stable isotope ratios close to the base of marine food chains (filter feeding infauna and zooplankton).
2. To collect samples to allow analysis of relationships between body size, energy content and trophic level (from nitrogen stable isotope analysis) in space and time for zooplankton, benthic invertebrate and fish communities.
3. To collect samples to allow analysis of relationships between body size and production for zooplankton, benthic invertebrate and fish communities.
|Chief scientist||Michaela Schratzberger (Centre for Environment, Fisheries and Aquaculture Science Lowestoft Laboratory)|
|Cruise programme||(0.01 MB)|
|Cruise report||(0.08 MB)|
|Biology and fisheries|
|Zooplankton||Quantity: number of hauls = 8|
|Zoobenthos||Quantity: number of hauls = 11|
Description: 2m beam trawls to collect samples of scaldfish, solenette and bivalves to complement the 4m beam trawl samples.
|Demersal fish||Quantity: number of hauls = 6|
Description: 4m beam trawls. The fish caught on these tows were processed for stable isotope and energetic analysis.
|Geology and geophysics|
|Core - soft bottom||Quantity: number of cores = 35|
Description: NIOZ cores to obtain benthic infauna for stable isotope and energetic analysis.