Deutsches Ozeanographisches
Datenzentrum
Inventur der Alkor-Reise AL521 (DOD-Ref-No.20190008)
Inventory of Alkor Cruise AL521 (DOD-Ref-No.20190008)
Plattform Platform |
Reise-Nr. Cruise-No. |
Zeitraum Period |
Projekt Project |
Arbeitsgebiet Working area |
---|---|---|---|---|
Alkor | AL521 | 16.04.2019 - 02.05.2019 | Gdansk Bight Baltic Sea Gotland Basin Kiel Bight Bornholm Basin Arkona Basin Mecklenburg Bight |
Fahrtleiter Chief Scientist | Institut Institute | Auslaufhafen Port of departure | Einlaufhafen Port of return | Stationskarte Station map | Schiffsroute Trackchart |
---|---|---|---|---|---|
Dierking Jan | Helmholtz Centre for Ocean Research Kiel (GEOMAR) | Kiel | Kiel |
Ziel der Reise / Objectives of Cruise:
Physical, chemical, biological research and fishery oceanography 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 data- and sample sets support ongoing projects in the Research Unit Marine Evolutionary Ecology at GEOMAR, as well as the EU Horizon 2020 project GoJelly and several international collaborations. 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 cruise area, plankton surveys (zoo- and ichthyplankton including gelatinous plankton, 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. 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) sampling and experimental work of photosynthesis and respiration rates of different phytoplankton fractions.
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 | 14 | hauls | B08 Phytoplankton |
Water samples for oxygen calibration, phytoplankton, food web sampling (Rosette sampler) | no |
VTISF | Schaber Matthias | 14 | hauls | B08 Phytoplankton |
Water samples for oxygen calibration, phytoplankton, food web sampling (Rosette sampler) | no |
GEOMAH | Clemmesen Catriona | 9 | hauls | B09 Zooplankton |
Ichthyo- and zooplankton distribution (multinet MAXI 335 ?m towed) | no |
GEOMAH | Clemmesen Catriona | 9 | 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 | 5 | hauls | B09 Zooplankton |
Integrated vertical zooplankton hauls (WP3 1000 ?m) | no |
GEOMAH | Dierking Jan | 6 | hauls | B09 Zooplankton |
Integrated vertical zooplankton hauls (Apstein net 55?m) | no |
GEOMAH | Dierking Jan | 14 | hauls | B09 Zooplankton |
Integrated vertical zooplankton hauls (WP2 200 ?m) | no |
GEOMAH | Dierking Jan | 15 | hauls | B09 Zooplankton |
Integrated vertical zooplankton hauls (WP2 100 ?m) | no |
GEOMAH | Clemmesen Catriona | 9 | hauls | B13 Eggs/larvae |
Ichthyo- and zooplankton distribution (multinet MAXI 335 ?m towed) | no |
GEOMAH | Clemmesen Catriona | 9 | 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 | 93 | hauls | B13 Eggs/larvae |
Horizontally and vertically integrated ichthyoplankton hauls (Bongo nets 150, 335, 500 ?m) | no |
GEOMAH | Dierking Jan | 25 | hauls | B14 Pelagic fish |
Pelagic fishery (pelagic trawl) | no |
VTISF | Schaber Matthias | 1 | transects | B28 Acoustic reflection on marine organisms |
hydroacoustic data (continuous along cruise track) | no |
GEOMAH | Dierking Jan | 128 | stations | H00 Stations |
- | yes |
GEOMAH | Dierking Jan | 14 | hauls | H09 Water bottle stations |
Water samples for oxygen calibration, phytoplankton, food web sampling (Rosette sampler) | no |
VTISF | Schaber Matthias | 14 | hauls | H09 Water bottle stations |
Water samples for oxygen calibration, phytoplankton, food web sampling (Rosette sampler) | no |
GEOMAH | Dierking Jan | 109 | stations | H10 CTD-Stations |
Vertical CTD profiles on station grid | no |