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    Late Holocene ecological shifts and chironomid-inferred summer temperature changes reconstructed from lake Uddelermeer, the Netherlands

    Gouw-Bouman, M. and van Asch, N. and Engels, Stefan and Hoek, W. (2019) Late Holocene ecological shifts and chironomid-inferred summer temperature changes reconstructed from lake Uddelermeer, the Netherlands. Palaeogeography, Palaeoclimatology, Palaeoecology , ISSN 0031-0182. (In Press)

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    Abstract

    This paper presents a Late-Holocene chironomid-inferred July-air temperature record from a core obtained from Lake Uddelermeer in the Netherlands. A core interval, which dates from 2500 to 400 cal. yr. BP, was analysed at multidecadal resolution for organic content, pollen, spores and NPPs (Non Pollen Palynomorphs), and chironomid head capsules. These proxies indicate that, from 2500 to 1140 cal. yr. BP, the lake was mesotrophic and sustained a Littorellion, while the chironomid assemblage was dominated by littoral species associated with macrophytes. At 1140 cal. yr. BP a shift in the lake ecology occurred from low-nutrient to high-nutrient conditions dominated by algae. This shift might be linked to a concurrent increase in human impact and is reflected in the chironomid assemblage by increases in eurytopic taxa, which are resistant to disturbances. Shifts in the chironomid record between 2500 and 1140 cal. yr. BP do not coincide with changes in lake ecology and are presumably driven by climate change. Using a Norwegian-Swiss calibration dataset as a modern analogue, we produced a chironomid-inferred temperature (C-IT) reconstruction. This reconstruction compares well to other regional temperature reconstructions in timing and duration with a Roman Warm period between 2240-1760 cal. yr. BP, a Dark Age Cold Period starting at 1760 cal. yr. BP and the Medieval Climate Anomaly beginning at 1280 cal. yr. BP. The C-IT record indicates a temperature drop of 1.5°C from the Roman Warm Period to the Dark Age Cold Period. Findings improve knowledge of the first millennium AD in NW Europe, which was characterised by changes in landscape, vegetation, society and climate.

    Metadata

    Item Type: Article
    School: Birkbeck Schools and Departments > School of Social Sciences, History and Philosophy > Department of Geography
    Depositing User: Stefan Engels
    Date Deposited: 11 Sep 2019 11:09
    Last Modified: 11 Sep 2019 11:16
    URI: http://eprints.bbk.ac.uk/id/eprint/28866

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