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Effects of shore-level displacement on the ecology of Baltic Sea bays
Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre.
2013 (English)Report (Other academic)
Abstract [en]

This report presents the up to date understanding of changes in ecological structure of small Baltic Sea bays following shore-level displacement and isolation of bays from the sea. It was producedas a part of the biosphere research programme, which has a strong emphasis on the characterization of properties and processes affecting the fate of potentially released radionuclides from the suggested repository of nuclear waste in the bedrock of the Forsmark area. The report has a focus on ecology and gives a description of input data, methodology and results on changes in flora and fauna communities, as well as some abiotic factors, with topographic isolation of bays from the sea. It is intended to describe the properties and conditions at the Forsmark site and to give information essential for demonstrating site specific understanding of processes and properties linked to a sea-to-lake succession. Long-term landscape development in the Forsmark area is dependent on two main and partly interdependent factors; shore-level displacement and climate variations. These two factors in combination strongly affect a number of processes, which in turn influence the development of ecosystems. Some examples of such processes are erosion and sedimentation, primary production and decomposition of organic matter. In this work focus has been to report changes in the structure and biomass of flora and fauna communities, which affect primary production, and influence the processes of decomposition of organic matter and sedimentation. A section of the study also deals with the biological processes of primary production, autotrophic carbon uptake and influence of allochtonous energy. The study is part of a description of the Forsmark ecosystem succession during a glacial cycle, which is one of the main objectives of the biosphere modelling at the Swedish Nuclear Fuel and Waste Management Company (SKB). The biomass of macrofauna was found to decrease with increasing isolation of bays. The changes in the macrofauna community also reflected the animals ability to re-colonize an unstable habitat, where slow colonizers with passively dispersed larvae were almost absent from the most isolated bays. Fast colonizers – particularly the ones with flying adults (insects) – were however found inhigher proportions in isolated bays. Contrary to the macrofauna and flora, the zooplankton and juvenile fish increased in biomass with increasing bay isolation. This study describes a significant change in ecological properties of Baltic Sea bays with shore-level displacement. This change affects ecosystem processes which may be of importance for the fate of potentially released radionuclides to the biosphere.

Place, publisher, year, edition, pages
Stockholm: Svensk kärnbränslehantering AB , 2013. , 53 p.
Series
, Technical Report, ISSN 1404-0344 ; TR-13-01
Keyword [en]
Surface ecosystem, Biosphere, Forsmark marine
National Category
Ecology Geology
Identifiers
URN: urn:nbn:se:su:diva-124284OAI: oai:DiVA.org:su-124284DiVA: diva2:883457
Available from: 2015-12-17 Created: 2015-12-17 Last updated: 2016-01-14Bibliographically approved

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Joakim P., Hansen
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Stockholm University Baltic Sea Centre
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