Deutsches Ozeanographisches
Datenzentrum Inventur der Alkor-Reise AL509 (DOD-Ref-No.20180013)
Inventory of Alkor Cruise AL509 (DOD-Ref-No.20180013)

Plattform
Platform
Reise-Nr.
Cruise-No.
Zeitraum
Period
Projekt
Project
Arbeitsgebiet
Working area
Alkor AL509 15.05.2018 - 30.05.2018 BONUS BLUEWEBS
GOJELLY
 
Gdansk Bight Baltic Sea Gotland Basin Kiel Bight Gulf of Riga Bornholm Basin Arkona Basin  

Fahrtleiter
Chief Scientist
Institut
Institute
Auslaufhafen
Port of departure
Einlaufhafen
Port of return
Stationskarte
Station map
Schiffsroute
Trackchart
Reusch Thorsten Helmholtz Centre for Ocean Research Kiel (GEOMAR) Kiel Kiel   

Ziel der Reise / Objectives of Cruise:

AL509:Physical, chemical, biological oceanography and fisheries research This multidisciplinary cruise extended a long-term data series on (eco-)system composition and functioning of the Baltic Sea, with a focus on the deeper basins. The series has been collected in similar form since 1986. A key characteristic of the cruise is the integration of oceanographic and biological information to enhance understanding of environmental and (fish) population fluctuations, and evolutionary processes in this system. The resulting datasets and samples feed into the EU projects BONUS BLUEWEBS and Horizon 2020 GoJelly, and the US NSF project "Evolutionary Responses to Global Change in Salinity and Temperature". The spatial focus lay on the Bornholm Basin as most important spawning area of Baltic cod, but also included the Western Baltic Sea, Arkona and Gotland Basin, Gdansk Deep, and Stolpe Trench. Specific investigations included a detailed hydrological survey (oxygen, salinity, temperature) of the Bornholm Basin, plankton surveys (zoo- and ichthyplankton, with the goal to determine the composition and the abundance and vertical and horizontal distribution of species, and to take samples for later measurements of nutritional condition), and pelagic fishery hauls for clupeid and gadoid fish. The latter served to determine stock structure, gonadal maturation, stomach contents, and egg production of sprat and cod, and to sample tissue and otolith samples for individual-level genetic and ecological analyses of cod. The abundance and distribution of fishes in the cruise area was also assessed with hydroacoustic methods. Additional cruise components were: (i) cod gonad sampling for fecundity studies and liver sampling for parasite studies. (ii) vertically resolved phytoplankton and zooplankton sampling for studies of plankton phenology. (iii) in-depth sampling of planktonic food webs for dietary tracer work. (iv) copepode Eurytemora affinis sampling along the salinity gradient of the Baltic Sea for the study of local adapations.

Messungen / Measurements

Institut
Institute
Wissenschaftler
Scientist
Anzahl
Number
Einheit
Unit
Typ der Messungen
Type of measurements
Kommentar
Comments
Daten im DOD
Data in DOD
GEOMAH Dierking Jan 3 hauls B08
Phytoplankton
Water samples for oxygen calibration, phytoplankton, food web sampling (Rosette sampler). no
VTISF Schaber Matthias 3 hauls B08
Phytoplankton
Water samples for oxygen calibration, phytoplankton, food web sampling (Rosette sampler). no
GEOMAH Clemmesen Catriona 8 hauls B09
Zooplankton
Ichthyo- and zooplankton distribution (multinet MAXI 335 ?m towed) . no
GEOMAH Clemmesen Catriona 8 hauls B09
Zooplankton
Ichthyo- and zooplankton distribution (multinet MIDI 50 ?m vertical). no
GEOMAH Clemmesen Catriona 25 hauls B09
Zooplankton
Horizontally and vertically integrated ichtyoplankton hauls (IKS80 500 ?m). no
GEOMAH Dierking Jan 2 hauls B09
Zooplankton
Integrated vertical zooplankton hauls (WP2 200 ?m). no
GEOMAH Dierking Jan 6 hauls B09
Zooplankton
Integrated vertical zooplankton hauls (Apstein net 55?m). no
GEOMAH Dierking Jan 6 hauls B09
Zooplankton
Integrated vertical zooplankton hauls (WP2 100 ?m). no
GEOMAH Clemmesen Catriona 8 hauls B13
Eggs/larvae
Ichthyo- and zooplankton distribution (multinet MAXI 335 ?m towed) . no
GEOMAH Clemmesen Catriona 8 hauls B13
Eggs/larvae
Ichthyo- and zooplankton distribution (multinet MIDI 50 ?m vertical). no
GEOMAH Clemmesen Catriona 25 hauls B13
Eggs/larvae
Horizontally and vertically integrated ichtyoplankton hauls (IKS80 500 ?m). no
GEOMAH Clemmesen Catriona 91 hauls B13
Eggs/larvae
Horizontally and vertically integrated ichthyoplankton hauls (Bongo nets 150, 335, 500 ?m). no
GEOMAH Reusch Thorsten 18 hauls B14
Pelagic fish
Pelagic fishery (pelagic trawl). no
VTISF Schaber Matthias 1 survey B28
Acoustic reflection on marine organisms
hydroacoustic data (continuous along cruise track). no
GEOMAH Reusch Thorsten 119 stations H00
Stations
- yes
GEOMAH Dierking Jan 3 hauls H09
Water bottle stations
Water samples for oxygen calibration, phytoplankton, food web sampling (Rosette sampler). no
VTISF Schaber Matthias 3 hauls H09
Water bottle stations
Water samples for oxygen calibration, phytoplankton, food web sampling (Rosette sampler). no
GEOMAH von Dewitz Burkhard 98 stations H10
CTD-Stations
Vertical CTD profiles on station grid. no
23.3.2024