000K  utf8
1100  $c2002
1500  eng
2050  urn:nbn:de:gbv:8-diss-6393
3000  Meiners, Klaus
4000  Sea-ice communities$dstructure and composition in Baltic, Antarctic and Arctic seas$hChristian-Albrechts-Universität zu Kiel  [Meiners, Klaus]
4030  Kiel$nChristian-Albrechts-Universität zu Kiel
4209  Sea ice is an important structural component of polar marine ecosystems but also at lower latitude seas like e.g. the northern Baltic Sea. This study summarises observations on biological, chemical and physical characteristics of sea ice and under-ice water obtained during three expeditions to the Baltic Sea, the Fram Strait area (Arctic) and the Bellingshausen Sea (Antarctica). The study aimed at a better understanding and quantification of different components of the sea ice related food web. The seasonal Baltic sea ice is least studied and therefore the work in this area focused on an inventory determination of the abundance and biomass composition of the sympagic (=ice-associated) community of the Bothnian Bay and Bothnian Sea as well as on the importance of abiotic and biotic factors in the control of ice algal accumulation. The work on the better explored polar sea ice focused on the abundance, distribution and characteristics of transparent exopolymer particles (TEP) in Arctic and Antarctic sea ice. TEP are a recently described class of exopolymeric particles, which are formed abiotically and biotically from polysaccharid-rich precursors. High amounts of TEP-precursors are released by bacteria and algae especially in response to environmental stress. In the pelagic realm TEP are important in the aggregation of diatom blooms, provide the matrix of macroaggregates and serve as substrate and habitat for attached bacteria. High concentrations of TEP have been recently described for Arctic sea ice and may have an important impact on carbon dynamics in sea-ice systems. The present study related TEP concentrations to biotic and abiotic sea ice parameters, potential modes of TEP formation were elucidated and the importance of TEP for the sea-ice habitat was discussed.
4950  https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-6393$xR$3Volltext$534
4961  https://macau.uni-kiel.de/receive/diss_mods_00000639
5051  570
5550  Biozönose
5550  Meereis
5550  Ostsee
5550  Polargebiete
5550  Stoffhaushalt
5550  TEP