Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Alkor	AL594	13.05.2023 - 28.05.2023	DAM SPACEPARTI DFG - TRANSLATIONAL EVOLUTIONARY RESEARC	Arkona Basin Mecklenburg Bight Baltic Sea Kiel Bight Bornholm 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:

In the context of climate change and increasing anthropogenic use, the Baltic Sea has undergone profound and, in a global comparison, particularly rapid changes over the last 50 years, such as warming, acidification, eutrophication, increasing oxygen deficiency, overfishing and the spread of invasive species. The ecological and economic consequences of these long-term changes are difficult to track through short-term projects. This makes long-term data series that also map decadal patterns all the more important. The main objective of the AL594 cruise is to continue one of the best available long-term data series for the western and central Baltic Sea by sampling and hydrographic measurements. Thus, since 1986, pelagic trawling and fish sampling, sampling of the pelagic food web (phyto- and zooplankton including ichthyo- and gelatinous plankton), oceanographic/hydrographic measurements and hydroacoustic surveys have been carried out in the deep basins of the Baltic Sea with the main focus on the Bornholm Basin using consistent methodology. The sampling of the western and eastern cod stocks focuses on the collection of blood samples for the extraction of high molecular weight DNA; which in turn is essential for long read sequencing technologies, as well as the quantification of juvenile (<15cm) cod and the distribution and abundance of planktonic cod larvae. The samples and data obtained are relevant for various projects and international collaborations of the department "Marine Evolutionary Ecology" at GEOMAR. These include in particular the project "Fishery-induced Evolution" within the framework of the DFG graduate school TransEvo (CAU /GEOMAR; PI Reusch) as well as the DAM-funded project SpaceParti (PI Reusch). Special projects in 20223 also include the isolation of marine viruses and the phytoyplankton species Ostreococcus for the project (cooperation with IMF-Uni HH, Dr Luisa Listmann), the first-time use of McLane in-situ pumps (project Dr. Kristin Bergauer, GEOMAR) and sampling of adult, spawning cod for detailed investigation of fecundity (cooperation DTU Aqua, Dr. Jonna Tomkiewicz), and parasite load in the livers (cooperation DTU Aqua, Dr. Jane Behrens).

Messungen / Measurements