Deutsches Ozeanographisches
Datenzentrum
Inventur der Alkor-Reise AL435 (DOD-Ref-No.20140257)
Inventory of Alkor Cruise AL435 (DOD-Ref-No.20140257)
Plattform Platform |
Reise-Nr. Cruise-No. |
Zeitraum Period |
Projekt Project |
Arbeitsgebiet Working area |
---|---|---|---|---|
Alkor | AL435 | 14.04.2014 - 29.04.2014 | BIOACID VECTORS BONUS BIO-C3 |
Arkona Basin Gdansk Bight Baltic Sea Gotland Basin Kiel Bight Bornholm Basin |
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 | Karte Map |
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 datasets and samples are essential for a number of ongoing projects, including the international project BONUS BIO-C3 coordinated by GEOMAR. The spatial focus lay on the Bornholm Basin (the most important spawning area of Baltic cod), but also included the Western Baltic Sea, Arkona and Gotland Basin and Gdansk Deep. Specific investigations included a detailed hydrographic 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 for later genetic analyses and otoliths for age estimatation of individual cod. The abundance and distribution of fish species in the investigated area was also assessed with hydroacoustic methods. Additional cruise components were: (i) Sampling and measurements to improve understanding of flounder stock structure and dynamics (ii) egg buoyancy experiments with flatfishes and cod, including the fertilization of eggs on board and measurements in density columns; (iii) measurements of sexual immune dimorphisms in cod and herring; (iv) sampling of muscle tissue of Baltic fishes for stable isotope and foodweb analysis of local fish assemblages.
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 | Hinrichsen Hans-Harald | 3 | hauls | B08 Phytoplankton |
Water samples for oxygen calibration, phytoplankton sampling (Rosette water sampler). | no |
GEOMAH | Clemmesen Catriona | 8 | hauls | B09 Zooplankton |
Ichthyo- and zooplankton distribution (multinet MIDI 50 ?m vertical) . | no |
GEOMAH | Clemmesen Catriona | 8 | hauls | B09 Zooplankton |
Integrated vertical zooplankton hauls (Apstein net 55 ?m). | no |
GEOMAH | Clemmesen Catriona | 8 | hauls | B09 Zooplankton |
Integrated vertical zooplankton hauls (WP2 100 ?m). | no |
GEOMAH | Clemmesen Catriona | 9 | hauls | B09 Zooplankton |
Ichthyo- and zooplankton distribution (multinet MIDI 300 ?m towed) . | no |
GEOMAH | Clemmesen Catriona | 10 | hauls | B09 Zooplankton |
Ichthyo- and zooplankton distribution (multinet MAXI 335 ?m towed) . | no |
GEOMAH | Clemmesen Catriona | 27 | hauls | B09 Zooplankton |
Horizontally and vertically integrated ichthyoplankton hauls (IKS80 500 ?m) . | no |
GEOMAH | Clemmesen Catriona | 8 | hauls | B13 Eggs/larvae |
Ichthyo- and zooplankton distribution (multinet MIDI 50 ?m vertical) . | no |
GEOMAH | Clemmesen Catriona | 9 | hauls | B13 Eggs/larvae |
Ichthyo- and zooplankton distribution (multinet MIDI 300 ?m towed) . | no |
GEOMAH | Clemmesen Catriona | 10 | hauls | B13 Eggs/larvae |
Ichthyo- and zooplankton distribution (multinet MAXI 335 ?m towed) . | no |
GEOMAH | Clemmesen Catriona | 12 | hauls | B13 Eggs/larvae |
Ichthyoplankton sampling (Helgolander larvae net, 500 ?m). | no |
GEOMAH | Clemmesen Catriona | 27 | hauls | B13 Eggs/larvae |
Horizontally and vertically integrated ichthyoplankton hauls (IKS80 500 ?m) . | no |
GEOMAH | Clemmesen Catriona | 80 | hauls | B13 Eggs/larvae |
Horizontally and vertically integrated ichthyoplankton hauls (Bongo nets 150, 335, 500 ?m). | no |
GEOMAH | Dierking Jan | 36 | hauls | B14 Pelagic fish |
Pelagic fishery (pelagic trawl). | no |
VTISF | Schaber Matthias | 1 | tracks | B28 Acoustic reflection on marine organisms |
hydroacoustic data (continuous along cruise track). | no |
GEOMAH | Dierking Jan | 121 | stations | H00 Stations |
- | yes |
GEOMAH | Hinrichsen Hans-Harald | 3 | hauls | H09 Water bottle stations |
Water samples for oxygen calibration, phytoplankton sampling (Rosette water sampler). | no |
GEOMAH | Hinrichsen Hans-Harald | 110 | stations | H10 CTD-Stations |
Vertical CTD profiles on station grid. | no |