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Anthropogenic and climatic impacts on a coastal environment in the Baltic Sea over the last 1000 years
Department of Geology, Lund University, Sweden.
Department of Geology, Lund University, Sweden; Department of Physical Geography and Ecosystems Science, Lund University, Sweden.
Södertörn University, School of Natural Sciences, Technology and Environmental Studies, Environmental Science.
Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Utrecht, Netherlands; Department of Environmental Sciences, University of Helsinki, Helsinki, Finland.
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2018 (English)In: Anthropocene, E-ISSN 2213-3054, Vol. 21, p. 66-79Article in journal (Refereed) Published
Abstract [en]

Coastal environments have experienced large ecological changes as a result of human activities over the last 100−200 years. To understand the severity and potential consequences of such changes, paleoenvironmental records provide important contextual information. The Baltic Sea coastal zone is naturally a vulnerable system and subject to significant human-induced impacts. To put the recent environmental degradation in the Baltic coastal zone into a long-term perspective, and to assess the natural and anthropogenic drivers of environmental change, we present sedimentary records covering the last 1000 years obtained from a coastal inlet (Gåsfjärden) and a nearby lake (Lake Storsjön) in Sweden. We investigate the links between a pollen-based land cover reconstruction from Lake Storsjön and paleoenvironmental variables from Gåsfjärden itself, including diatom assemblages,organic carbon (C) and nitrogen (N) contents, stable C and N isotopic ratios, and biogenic silica contents. The Lake Storsjön record shows that regional land use was characterized by small-scale agricultural activity between 900 and 1400 CE, which slightly intensified between 1400 and 1800 CE. Substantial expansion of cropland was observed between 1800 and 1950 CE, before afforestation between 1950 and 2010 CE. From the Gåsfjärden record, prior to 1800 CE, relatively minor changes in the diatom and geochemical proxies were found. The onset of cultural eutrophication in Gåsfjärden can be traced to the 1800s and intensified land use is identified as the main driver. Anthropogenic activities in the 20th century have caused unprecedented ecosystem changes in the coastal inlet, as reflected in the diatom composition and geochemical proxies.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 21, p. 66-79
Keywords [en]
land use, eutrophication, mining, hypoxia, coastal area, Baltic Sea
National Category
Earth and Related Environmental Sciences
Research subject
Environmental Studies
Identifiers
URN: urn:nbn:se:sh:diva-34716DOI: 10.1016/j.ancene.2018.02.003ISI: 000429091500006Scopus ID: 2-s2.0-85043469367Local ID: 1562/3.1.1/2013OAI: oai:DiVA.org:sh-34716DiVA, id: diva2:1187628
Funder
Swedish Research Council Formas, 217-2010-126The Foundation for Baltic and East European Studies, 1562/3.1.1/2013The Crafoord FoundationEU, European Research Council, 278364
Note

Funder

Royal Physiographic Society in Lund

Netherlands Organization for Scientific Research (NWO Vidi 86405.004)

Available from: 2018-03-05 Created: 2018-03-05 Last updated: 2018-04-26Bibliographically approved

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Norbäck Ivarsson, LenaAndrén, Elinor

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