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Using a decadal diatom sediment trap record to unravel seasonal processes important for the formation of the sedimentary diatom signal
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2018 (English)In: Journal of Paleolimnology, ISSN 0921-2728, E-ISSN 1573-0417, Vol. 60, no 2, p. 133-152Article in journal (Refereed) Published
Abstract [en]

Sediment trap studies and high frequency monitoring are of great importance to develop a deeper understanding of how seasonal environmental processes are imprinted in sediment signal formation. We collected whole year diatom assemblages from 2002 to 2014 with a sequential sediment trap from a varved boreal lake (Nylandssjon, Sweden) together with environmental and limnological parameters, and compared them with the corresponding diatom record of the annual laminated sediment. Our data set indicates a large year-to-year variability of diatom succession and abundance patterns, which is well reflected in the varved sediments. Specifically, Cyclotella glomerata dominated the annual sediment trap record (as well as in the corresponding sediment varves) in years with warmer air temperatures in March/April, and Asterionella formosa dominated the annual sediment assemblages as a consequence of years characterized by higher runoff before lake over-turn. Years succeeding forest clearance in the lake catchment showed marked increase in diatom and sediment flux. The DCA scores of the yearly diatom trap assemblages clearly resemble the lake's thermal structure, which indicates that the relative abundance of major taxa seems primarily controlled by the timing of seasonal environmental events, such as above-average winter air temperature and/or autumn runoff and the current thermal structure of the lake. The high seasonal variability between environmental drivers in combination with the physical limnology leaves us with several possible scenarios leading to either an A. formosa versus C. glomerata dominated annual diatom sediment signal. With this study we highlight that short-term environmental events and seasonal limnological conditions are of major importance for interpreting annual sediment signals.

Place, publisher, year, edition, pages
Springer, 2018. Vol. 60, no 2, p. 133-152
Keywords [en]
Annual diatom flux, Sequential sediment trap, Varved lake sediments, Seasonal air temperature, Discharge, Catchment
National Category
Geology Ecology
Identifiers
URN: urn:nbn:se:umu:diva-150660DOI: 10.1007/s10933-018-0020-5ISI: 000437128400003Scopus ID: 2-s2.0-85042094692OAI: oai:DiVA.org:umu-150660DiVA, id: diva2:1242577
Available from: 2018-08-28 Created: 2018-08-28 Last updated: 2018-08-28Bibliographically approved

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Maier, Dominique BéatriceRenberg, IngemarBigler, Christian

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