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 Gotland Basin Bornholm Basin Baltic Sea Kiel Bight  

Fahrtleiter
Chief Scientist
Institut
Institute
Auslaufhafen
Port of departure
Einlaufhafen
Port of return
Stationskarte
Station map
Schiffsroute
Trackchart
Dierking Jan GEOMAR Helmholtz-Zentrum fur Ozeanforschung Kiel 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 Mathias 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
15.9.2018