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Journal of Micropalaeontology An open-access journal of The Micropalaeontological Society
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Volume 28, issue 2
J. Micropalaeontol., 28, 131-142, 2009
https://doi.org/10.1144/jm.28.2.131
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 4.0 License.
J. Micropalaeontol., 28, 131-142, 2009
https://doi.org/10.1144/jm.28.2.131
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Nov 2009

01 Nov 2009

Recent benthic foraminifera in the Flensburg Fjord (Western Baltic Sea)

Irina Polovodova1,2, Anna Nikulina2, Joachim Schönfeld2, and Wolf-Christian Dullo2 Irina Polovodova et al.
  • 1University of Gothenburg, Department of Earth Sciences, PO Box 460, SE-405 30 Gothenburg, Sweden
  • 2Leibniz Institute for Marine Sciences, IFM-GEOMAR, Wischhofstrasse 1-3, D-24148 Kiel, Germany

Keywords: benthic foraminifera, salinity, oxygen depletion, foraminiferal cysts, Baltic Sea

Abstract. Living benthic foraminifera of Flensburg Fjord were surveyed in June 2006. The muddy and organic-rich sediments of the inner fjord were dominated by Elphidium incertum. E. incertum and E. excavatum were frequent in muds and sandy muds of the fjord loop around Holnis Peninsula and in the outer part. Gelting Bay yielded a different biofacies, indicating a brackish and sandy habitat, poor in food supply and with microfauna dominated by Ammonia beccarii and E. albiumbilicatum. The central fjord and nearshore zones of the loop were characterized by sandy muds, relatively poor in food and occupied by A. beccarii, E. incertum and E. excavatum subspecies. High abundances of E. excavatum were encountered in the innermost fjord, with fine-grained and organic-rich muddy sediments.

A comparison with previous studies revealed the profound changes in species composition in the outer Flensburg Fjord since the 1970s. A decline in numbers of Ammotium cassis and flourishing of Ammonia beccarii in Gelting Bay were recognized. These changes are most likely associated with decreased intensity and frequency of salt-water inflows into the Baltic Sea since the 1960s. It is inferred that the decline of A. cassis is similar to that of Eggerelloides scaber, which currently is found only in depressions of Kiel Bight with higher salinity.

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