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Reconstructing the history of eutrophication and quantifying total nitrogen reference conditions in Bothnian Sea coastal waters
Södertörn University, School of Natural Sciences, Technology and Environmental Studies, Environmental Science.ORCID iD: 0000-0002-6763-1697
University of Bergen.
Stockholm University.
2016 (English)In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015Article in journal (Refereed) In press
Abstract [en]

Reference total nitrogen (TN) concentrations for the Gårdsfjärden estuary in the central Bothnian Sea, which receives discharge from an industrial point-source, have been estimated from diatom assemblages using a transfer function. Sedimentological and diatom evidence imply a good ecological status before 1920 with an assemblage dominated by benthic taxa indicating excellent water transparency, high diatom species richness and less organic sedimentation resulting in homogeneous well oxygenated sediments. A change in the diatom assemblage starts between 1920 and 1935 when the species richness declines and the proportion of planktic taxa increases. Increased organic carbon sedimentation after 1920 led to hypoxic bottom waters, and the preservation of laminae in the sediments. The trend in the reconstructed TN-values agrees with the history of the discharge from the mill, reaching maximum impact during the high discharge between 1945 and 1990. The background condition for TN in Gårdsfjärden is 260-300 μg L-1, reconstructed until 1920.

Place, publisher, year, edition, pages
Keyword [en]
Baltic Sea, Nitrogen reconstruction, Diatoms, Transfer function, Water framework directive, BSAP
National Category
Earth and Related Environmental Sciences
Research subject
Environmental Studies
URN: urn:nbn:se:sh:diva-30837DOI: 10.1016/j.ecss.2016.07.015Local ID: 1562/3.1.1/2013OAI: diva2:967463
Nordic Council of Ministers, 04NUT9EU, FP7, Seventh Framework Programme, EVK3-CT-2000-00031The Foundation for Baltic and East European Studies, 1562/3.1.1/2013
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2016-09-09Bibliographically approved

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