Sedimentary lipid biomarkers in the magnesium rich and highly alkaline Lake Salda (south-western Anatolia)

  • Jérôme Kaiser | jerome.kaiser@io-warnemuende.de Leibniz Institute for Baltic Sea Research Warnemünde (IOW), Germany.
  • Bora Ön Muğla Sıtkı Koçman University, Turkey.
  • Helge W. Arz Leibniz Institute for Baltic Sea Research Warnemünde (IOW), Germany.
  • Sena Akçer-Ön Muğla Sıtkı Koçman University, Turkey.

Abstract

Lake Salda located in south-western Anatolia is characterized by the presence of living stromatolites and by a low diversity of both phytoplankton and zooplankton due to high pH and magnesium concentration. The most abundant, free sedimentary lipids of the uppermost centimetres of the lake sediments were studied as potential environmental biomarkers, and proxies based on glycerol dialkyl glycerol tetraethers (GDGT) were tested in this extreme environment. Dinosterol and tetrahymanol are potentially relevant biomarkers for the dinoflagellate Peridinium cinctum and ciliates, respectively. C20:1 and C25:2 highly branched isoprenoid (HBI) alkenes, and n-C17 alkane and n-C17:1 alkene are considered as representing, respectively, diatoms and Cyanobacteria involved in the formation of the stromatolites. Isoprenoid GDGT-0 is assumed to be derived mainly from Euryarchaeota (methanogens), and crenarchaeol from Thaumarchaeota. Allochthonous organic material is represented by long-chain n-alkanes and n-alkanols derived from land plant leaf waxes, as well as branched GDGTs produced by soil bacteria. While pH and temperature proxies based on branched GDGTs are likely not applicable in Lake Salda, TEX86 (tetraether index of tetraethers consisting of 86 carbons), a proxy based on isoprenoid GDGTs, potentially allows estimating mean annual lake surface temperature. Interestingly, C23 and C25 1,2 diols, which have a yet unknown origin, were found for the first time in lake sediments. This study represents the first investigation of sedimentary lipid distribution in an alkaline and magnesium-rich lake in Anatolia, and provides a basis for future biomarker-based paleoenvironmental reconstruction of Lake Salda.

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Published
2016-06-30
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Keywords:
Sedimentary biomarkers, GDGTs, 1, 2 diols, alkaline, Lake Salda.
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How to Cite
1.
Kaiser J, Ön B, Arz HW, Akçer-Ön S. Sedimentary lipid biomarkers in the magnesium rich and highly alkaline Lake Salda (south-western Anatolia). J Limnol [Internet]. 2016Jun.30 [cited 2020Sep.19];75(3). Available from: https://jlimnol.it/index.php/jlimnol/article/view/jlimnol.2016.1337