Articles | Volume 37, issue 2
https://doi.org/10.5194/jm-37-403-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/jm-37-403-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
07 Sep 2018
Research article |
| 07 Sep 2018
| 07 Sep 2018
Assessing proxy signatures of temperature, salinity, and hypoxia in the Baltic Sea through foraminifera-based geochemistry and faunal assemblages
Jeroen Groeneveld
CORRESPONDING AUTHOR
Center for Marine Environmental Sciences (MARUM), University of
Bremen, Klagenfurter Strasse 2–4, 28359 Bremen, Germany
Department of Geology, Lund University, Sölvegatan 12, 223 62
Lund, Sweden
Helena L. Filipsson
Department of Geology, Lund University, Sölvegatan 12, 223 62
Lund, Sweden
William E. N. Austin
School of Geography and Sustainable Development, University of St.
Andrews, North Street, St. Andrews, KY16 9AL, UK
Scottish Association for Marine Science, Scottish Marine Institute,
Oban, PA37 1AQ, UK
Kate Darling
School of Geography and Sustainable Development, University of St.
Andrews, North Street, St. Andrews, KY16 9AL, UK
School of Geosciences, University of Edinburgh, James Hutton Road,
Edinburgh, EH9 3FE, UK
David McCarthy
School of Geography and Sustainable Development, University of St.
Andrews, North Street, St. Andrews, KY16 9AL, UK
Nadine B. Quintana Krupinski
Department of Geology, Lund University, Sölvegatan 12, 223 62
Lund, Sweden
Clare Bird
School of Geosciences, University of Edinburgh, James Hutton Road,
Edinburgh, EH9 3FE, UK
Biological and Environmental Sciences, University of Stirling,
Stirling, FK9 4LA, UK
Magali Schweizer
School of Geosciences, University of Edinburgh, James Hutton Road,
Edinburgh, EH9 3FE, UK
LPG-BIAF UMR CNRS 6112, University of Angers, 2 bd Lavoisier, 49045
Angers CEDEX 01, France
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Seawater naturally contains trace metals such as Mo and U, which accumulate under low oxygen conditions on the seafloor. Previous studies have used sediment Mo and U contents as an archive of changing oxygen concentrations in coastal waters. Here we show that in fjords the use of Mo and U for this purpose may be impaired by additional processes. Our findings have implications for the reliable use of Mo and U to reconstruct oxygen changes in fjords.
Christiane Schmidt, Emmanuelle Geslin, Joan M. Bernhard, Charlotte LeKieffre, Mette Marianne Svenning, Helene Roberge, Magali Schweizer, and Giuliana Panieri
Biogeosciences, 19, 3897–3909, https://doi.org/10.5194/bg-19-3897-2022, https://doi.org/10.5194/bg-19-3897-2022, 2022
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This study is the first to show non-selective deposit feeding in the foraminifera Nonionella labradorica and the possible uptake of methanotrophic bacteria. We carried out a feeding experiment with a marine methanotroph to examine the ultrastructure of the cell and degradation vacuoles using transmission electron microscopy (TEM). The results revealed three putative methanotrophs at the outside of the cell/test, which could be taken up via non-targeted grazing in seeps or our experiment.
Raúl Tapia, Sze Ling Ho, Hui-Yu Wang, Jeroen Groeneveld, and Mahyar Mohtadi
Biogeosciences, 19, 3185–3208, https://doi.org/10.5194/bg-19-3185-2022, https://doi.org/10.5194/bg-19-3185-2022, 2022
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Inda Brinkmann, Christine Barras, Tom Jilbert, Tomas Næraa, K. Mareike Paul, Magali Schweizer, and Helena L. Filipsson
Biogeosciences, 19, 2523–2535, https://doi.org/10.5194/bg-19-2523-2022, https://doi.org/10.5194/bg-19-2523-2022, 2022
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The concentration of the trace metal barium (Ba) in coastal seawater is a function of continental input, such as riverine discharge. Our geochemical records of the severely hot and dry year 2018, and following wet year 2019, reveal that prolonged drought imprints with exceptionally low Ba concentrations in benthic foraminiferal calcium carbonates of coastal sediments. This highlights the potential of benthic Ba / Ca to trace past climate extremes and variability in coastal marine records.
Lukas Jonkers, Geert-Jan A. Brummer, Julie Meilland, Jeroen Groeneveld, and Michal Kucera
Clim. Past, 18, 89–101, https://doi.org/10.5194/cp-18-89-2022, https://doi.org/10.5194/cp-18-89-2022, 2022
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Short summary
Current climate and environmental changes strongly affect shallow marine and coastal areas like the Baltic Sea. The combination of foraminiferal geochemistry and environmental parameters demonstrates that in a highly variable setting like the Baltic Sea, it is possible to separate different environmental impacts on the foraminiferal assemblages and therefore use chemical factors to reconstruct how seawater temperature, salinity, and oxygen varied in the past and may vary in the future.
Current climate and environmental changes strongly affect shallow marine and coastal areas like...
