Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Heincke	HE581	02.08.2021 - 20.08.2021

Fahrtleiter Chief Scientist	Institut Institute	Auslaufhafen Port of departure	Einlaufhafen Port of return	Stationskarte Station map	Schiffsroute Trackchart
Beermann Jan	Alfred-Wegener-Institut fur Polar- und Meeresforschung	Bremerhaven	Bremerhaven

Ziel der Reise / Objectives of Cruise:

After leaving Bremerhaven, the first work area in the Natura2000 area Borkum Reef Ground was approached and 25 stations (10 stations LRT 1110 [sand banks] + 15 stations LRT 1170 [reefs]) were sampled as part of the FFH monitoring. After completion of the work in this area, the journey to the next work area north of the Borkum Reef Ground was continued and 41 stations were sampled from south to north as part of the MSFD monitoring for the broad habitat type of the circalittoral mud and the so-called 'sea pen and burrowing megafauna communities'. The work area in the Natura2000 area of the Dogger Bank was approached next. A total of 50 stations were sampled here as part of the effect study on the effectiveness of management measures to exclude bottom-contact trawling, using van Veen grabs, epibenthos dredges, towed underwater camera and, if necessary, CTD rosette, multicorer and MUC. This area has been intensively investigated in the context of this unique large-scale experiment since 2013 during the "before phase" prior to closure. A failure of the ship's own freshwater treatment system required to make a port call at Helgoland to bunker fresh water after the works on the Dogger Bank had been completed. After successfully filling the on-board fresh water tanks, the journey to the last two work areas northwest of the Sylt Outer Reef and west of the White Bank was continued. As part of the MSFD monitoring, a further 34 stations were sampled for the habitat types of the circalittoral mud and the sea pen and burrowing megafauna communities. In addition, 3 sediment sub-samples were taken from each sedimentological grab for microbiological investigations by the ICBM Oldenburg. At selected stations, also water samples were collected with the help of a CTD rosette approx. 2-3 m above the ground and sediment samples were collected using a multicorer to sample the microbial communities (carried out at ICBM) and to obtain eDNA (carried out at HIFMB). Due to the defective freshwater treatment system, which required an extra trip to Helgoland and back to the work area, as well as an approaching bad weather front from the northwest towards the end of the trip, the work had to be repeatedly suspended. Overall, these failures totaled to about 3.5 working days. Thanks to the well-organized crew, which then switched to flexible working hours, this loss of time was largely compensated for with shift work and all planned stations could be sampled. With the exception of the towed video system, which could only be driven in two of the work areas for the MSFD monitoring stations, all planned work was carried out for all stations.

Messungen / Measurements