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Archaeal community changes in Lateglacial lake sediments: Evidence from ancient DNA
Stockholm University, Faculty of Science, Department of Geological Sciences. Stockholm University, Science for Life Laboratory (SciLifeLab).
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Number of Authors: 132018 (English)In: Quaternary Science Reviews, ISSN 0277-3791, E-ISSN 1873-457X, Vol. 181, p. 19-29Article in journal (Refereed) Published
Abstract [en]

The Lateglacial/early Holocene sediments from the ancient lake at Hasseldala Port, southern Sweden provide an important archive for the environmental and climatic shifts at the end of the last ice age and the transition into the present Interglacial. The existing multi-proxy data set highlights the complex interplay of physical and ecological changes in response to climatic shifts and lake status changes. Yet, it remains unclear how microorganisms, such as Archaea, which do not leave microscopic features in the sedimentary record, were affected by these climatic shifts. Here we present the metagenomic data set of Hasseldala Port with a special focus on the abundance and biodiversity of Archaea. This allows reconstructing for the first time the temporal succession of major Archaea groups between 13.9 and 10.8 ka BP by using ancient environmental DNA metagenomics and fossil archaeal cell membrane lipids. We then evaluate to which extent these findings reflect physical changes of the lake system, due to changes in lake-water summer temperature and seasonal lake-ice cover. We show that variations in archaeal composition and diversity were related to a variety of factors (e.g., changes in lake water temperature, duration of lake ice cover, rapid sediment infilling), which influenced bottom water conditions and the sediment-water interface. Methanogenic Archaea dominated during the Allerod and Younger Dryas pollen zones, when the ancient lake was likely stratified and anoxic for large parts of the year. The increase in archaeal diversity at the Younger Dryas/Holocene transition is explained by sediment infilling and formation of a mire/peatbog.

Place, publisher, year, edition, pages
2018. Vol. 181, p. 19-29
Keywords [en]
Ancient DNA, Shotgun sequencing, Archaea, Metagenomics, Lipid biomarkers, Last deglaciation, Paleoclimate, Paleoenvironment, Lake sediments, Southern Sweden
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-153657DOI: 10.1016/j.quascirev.2017.11.037ISI: 000424178200002OAI: oai:DiVA.org:su-153657DiVA, id: diva2:1188452
Available from: 2018-03-07 Created: 2018-03-07 Last updated: 2018-03-07Bibliographically approved

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Schenk, FrederikRattray, Jayne E.Smittenberg, Rienk H.Afrifa Yamoah, KwekuSlotte, TanjaWohlfarth, Barbara
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Department of Geological SciencesScience for Life Laboratory (SciLifeLab)Department of Ecology, Environment and Plant Sciences
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