Skip to content

Research at St Andrews

Assessing proxy signatures of temperature, salinity, and hypoxia in the Baltic Sea through foraminifera-based geochemistry and faunal assemblages

Research output: Contribution to journalArticle

Author(s)

Jeroen Groeneveld, Helena L. Filipsson, William E. N. Austin, Kate Darling, David McCarthy, Nadine B. Quintana Krupinski, Clare Bird, Magali Schweizer

School/Research organisations

Abstract

Current climate and environmental changes strongly affect shallow marine and coastal areas like the Baltic Sea. This has created a need for a context to understand the severity and potential outcomes of such changes. The context can be derived from paleoenvironmental records during periods when comparable events happened in the past. In this study, we explore how varying bottom water conditions across a large hydrographic gradient in the Baltic Sea affect benthic foraminiferal faunal assemblages and the geochemical composition of their calcite tests. We have conducted both morphological and molecular analyses of the faunas and we evaluate how the chemical signatures of the bottom waters are recorded in the tests of several species of benthic foraminifera. We focus on two locations, one in the Kattegat (western Baltic Sea) and one in Hano Bay (southern Baltic Sea). We show that seawater Mn/Ca, Mg/Ca, and Ba/Ca (Mn/Casw, Mg/Casw, and Ba/Casw) variations are mainly controlled by dissolved oxygen concentration and salinity. Their respective imprints on the foraminiferal calcite demonstrate the potential of Mn/Ca as a proxy for hypoxic conditions, and Ba/Ca as a proxy for salinity in enclosed basins such as the Baltic Sea. The traditional use of Mg-Ca as a proxy to reconstruct past seawater temperatures is not recommended in the region, as it may be overprinted by the large variations in salinity (specifically on Bulimina marginata), Mg/Casw, and possibly also the carbonate system. Salinity is the main factor controlling the faunal assemblages: a much more diverse fauna occurs in the higher-salinity (similar to 32) Kattegat than in the low-salinity (similar to 15) Hano Bay. Molecular identification shows that only Elphidium clavatum occurs at both locations, but other genetic types of both genera Elphidium and Ammonia are restricted to either low-or high-salinity locations. 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 Mn/Ca, Mg/Ca, and Ba/Ca to reconstruct how specific conditions may have varied in the past.

Close

Details

Original languageEnglish
Pages (from-to)403-429
Number of pages27
JournalJournal of Micropalaeontology
Volume37
Issue number2
DOIs
StatePublished - 7 Sep 2018

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. The genetic diversity, phylogeography and morphology of Elphidiidae (Foraminifera) in the Northeast Atlantic

    Darling, K. F., Schweizer, M., Knudsen, K. L., Evans, K. M., Bird, C., Roberts, A., Filipsson, H. L., Kim, J-H., Gudmundsson, G., Wade, C. M., Sayer, M. D. J. & Austin, W. E. N. Dec 2016 In : Marine Micropaleontology. 129, p. 1-23 23 p.

    Research output: Contribution to journalArticle

  2. A new integrated approach to taxonomy: the fusion of molecular and morphological systematics with type material in benthic foraminifera

    Roberts, A. D., Austin, W., Evans, K., Bird, C., Schweizer, M. & Darling, K. 7 Jul 2016 In : PLoS One. 11, 7

    Research output: Contribution to journalArticle

  3. Palynology and micropalaeontology of the Pliocene - Pleistocene transition in outcrop from the western Caspian Sea, Azerbaijan: potential links with the Mediterranean, Black Sea and the Arctic Ocean?

    Richards, K., van Baak, C. G. C., Athersuch, J., Hoyle, T. M., Stoica, M., Austin, W. E. N., Cage, A. G., Wonders, A. A. H., Marret, F. & Pinnington, C. A. 15 Dec 2018 In : Palaeogeography, Palaeoclimatology, Palaeoecology. 511, p. 119-143

    Research output: Contribution to journalArticle

  4. Late Weichselian glacial history of Forlandsundet, western Svalbard: an inter-ice-stream setting

    Butschek, F., Arosio, R., Austin, W. E. N., Noormets, R. & Howe, J. A. 1 Dec 2018 In : arktos. First online, 14 p.

    Research output: Contribution to journalArticle

  5. Distribution and ecology of planktic foraminifera in the North Pacific: implications for paleo-reconstructions

    Taylor, B. J., Rae, J. W. B., Gray, W. R., Darling, K., Burke, A., Gersonde, R., Abelmann, A., Maier, E., Esper, O. & Ziveri, P. 1 Jul 2018 In : Quaternary Science Reviews. 191, p. 256-274 19 p.

    Research output: Contribution to journalArticle

Related by journal

  1. Arthur Earland (1866-1958) and his links with Ireland

    Wyse Jackson, P. N., Robinson, M. & Austin, W. E. N. Dec 2002 In : Journal of Micropalaeontology. 21, 2, p. 167-168 2 p.

    Research output: Contribution to journalArticle

ID: 255980453