Due to changing temperature regimes in the North- and the Wadden Sea, a fish survey in the Sylt Rømø bight (SRB) was established in 2007 for at least ten years. The aim is to investigate the Wadden Sea fish fauna with special interest in changes of migration behavior, species composition and feeding habits. Since 2021 an assessment of the epibenthic species in the net hauls was included. Seven stations are sampled monthly inside the SRB. Two additional stations, one outside the bight, one close to the Danish border are sampled as references four times a year. For sampling a mini bottom trawl, total length 17 m, trawl opening 7 m, height 3 m with a mesh size of 36 mm in the wings, 16 mm in the mid part and 6 mm in the cod end is used. At every station one haul in the water column and another at the bottom are sampled, for 15 minutes at a speed of approximately 2 knots. The data will help to give a more detailed picture of food chains and energy flows inside the Wadden Sea.
We have estimated the standing stocks in carbon units per m² in the Baltic Sea ecosystem for 18 living and non-living groups relevant to carbon cycle and management activities in the Baltic Sea. We included three non-living apartments: POC, DOC and sediment carbon. The living groups comprise: phytoplankton, protozooplankton, bacteria, zooplankton, macrophythes, benthos, plaice, flounder, herring, sprat, cod, ringed seals, seals, grey seals and harbour porpoises. The estimates are based on ICES raw data and literature data and represent spatial and temporal averages. Data, data sources, assumptions and calculations are described in detail to ensure reproducibility.
We collected, formatted and standardized publicly available data from publications and databases for 24 living carbon pools in the North Sea and calculated the carbon stock of these pools per m². The living groups include: Phytoplankton, Protozooplankton, Bacteria, Mesozooplankton, Zooplankton, Phytobenthos, Zoobenthos, Cod, Haddock, Saithe, Whiting, Norway pout, Herring, Sandeel, Sprat, Other fish, Grey Seal, Harbour Seal, Minke Whale, White beaked dolphin, Harbour porpoise, Bottlenose dolphin and White-sided dolphin. Estimates are based on the standing stock biomass of the studied organism groups and represent spatial and temporal averages. Data, data sources, assumptions and calculations are described in detail to ensure reproducibility. The data collection was carried out in the course of the project Anthropogenic impacts on particulate organic carbon cycling in the North Sea (APOC) funded by the German Federal Ministry of Education and Research (BMBF).