EGU2020-8249, updated on 12 Jun 2020
https://doi.org/10.5194/egusphere-egu2020-8249
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Recent environmental change in a marine protected area as reflected by sediment proxy data.

Irina Polovodova Asteman1, Thorbjørn Joest Andersen2, Torsten Linders1, Kjell Nordberg1, and Nicolas Van Nieuwenhove3
Irina Polovodova Asteman et al.
  • 1Department of Marine Sciences, University of Gothenburg, Sweden (irina.polovodova@marine.gu.se)
  • 2Department of Geosciences and Natural Resource Management, University of Copenhagen, Danmark
  • 3University of New Brunswick, Fredericton, Canada

The Koster Trench is the deepest part of the Kosterfjord (Skagerrak, North Sea), which stretches southward along the west coast of Sweden. Since 2009 Kosterfjord has been included in the Marine Protected Area Kosterhavet National Park due to the presence of cold-water coral reefs. In this study we present multiproxy data from the sediment core KSK12-01D taken in the southern part of the Koster Trench. The core has been dated by 137Cs and was subject to bulk geochemistry (TOC, C/N and heavy metals: Ni, Cu, Zn, As, Cd and Pb) and micropaleontological (benthic foraminifera, dinocysts and selected palynomorphs) analyses. Results show that the core is an archive for the environmental changes that took place between ~1988 and 2012. Both TOC and heavy metals indicate high/good to moderate ecological quality status, as defined by the Swedish Environmental Protection Agency. Dinocysts suggest a major change occurring in the upper water column around 2002. The cysts of Pentapharsodinium dalei peak around 1992 and shows overall slightly higher relative abundances between 1988 and 2002. Increased abundance of cysts produced by Protoceratium reticulatum (i.e. Operculodinium centrocarpum sensu Wall and Dale 1966), cysts produced by Biecheleria baltica and heterotrophic dinoflagellates, oligotrichids, pollen and spores characterise the upper core part deposited from 2002 to 2012. Furthermore, there is a clear increase of calcareous Alexandrium cysts in the top of the core (~2008-2012). Benthic foraminifera show a major faunal change reflected in a drastic increase of agglutinated species (mainly Textularia earlandi) from 2007 towards present day, while the lower part of the core (1988-2007) is dominated by calcareous species (Stainforthia fusiformis, Epistominella exigua, Cassidulina laevigata, Bulimina marginata andHyalinea balthica). Overall, the changes in the dataset suggest an increased freshwater input or a higher river/land runoff, as supported by a local climate and hydrography data showing increasing precipitation and particulate organic carbon in the surface waters over the time period covered by our record.

How to cite: Polovodova Asteman, I., Andersen, T. J., Linders, T., Nordberg, K., and Van Nieuwenhove, N.: Recent environmental change in a marine protected area as reflected by sediment proxy data. , EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-8249, https://doi.org/10.5194/egusphere-egu2020-8249, 2020

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