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Co-variation of crenarchaeol and branched GDGTs in globally-distributed marine and freshwater sedimentary archives

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https://ir.library.oregonstate.edu/concern/articles/cr56n260c

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  • Two major types of glycerol dialkyl glycerol tetraethers (GDGTs) are commonly used in paleoecological and paleoclimatological reconstructions: isoprenoidal and branched GDGTs. In aquatic environments, it was originally assumed that isoprenoidal GDGTs, especially crenarchaeol, derive mainly from aquatic Thaumarchaeota, whilst branched GDGTs are an allochthonous input derived from soil Bacteria. Recently, direct co-variation of crenarchaeol and branched GDGTs has been described in two marine sedimentary records, and this observation suggests in situ production of branched GDGTs is possible at least in some aquatic environments. After investigating 30 published and unpublished data sets from downcore and surface sediments as well as sediment traps from 19 distinct regions around the world, we found a widespread significant correlation between concentrations of branched GDGTs and crenarchaeol (p<0.01; r²=0.57-0.99), even when normalized against TOC, where available. These data sets include freshwater and marine environments with varying distances from the shore, varying redox conditions and different terrestrial matter input pathways. Our findings from this large-scale data set suggest that a common or mixed source for both GDGT types is actually commonplace in lacustrine and marine settings.
  • Keywords: Branched GDGTs, Oceans, Crenarchaeol, Archaea, Isoprenoid GDGTs, Lakes, In situ production,
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  • Fietz, S., Huguet, C., Bendle, J., Escala, M., Gallacher, C., Herfort, L., . . . Rosell-Mele, A. (2012). Co-variation of crenarchaeol and branched GDGTs in globally-distributed marine and freshwater sedimentary archives. Global and Planetary Change, 92-93, 275-285. doi: 10.1016/j.gloplacha.2012.05.020
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  • 92-93
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  • S.F. thanks the Deutsche Forschungsgemeinschaft (DFG) for a Postdoctoral Fellowship (FI 1466/1-1). S.F. and C.H. thank the Spanish Ministerio de Ciencia e Innovación (MICINN) for Juan de la Cierva fellowships. M.E. thanks the Generalitat de Catalunya. J.B. thanks the Natural Environment Research Council (NE/C508934/1), the Ocean Drilling Programme (IODP), The Carnegie Trust for the Universities of Scotland, and the Projects ‘Millennium’ and IMAGES. E.L.M. thanks Natural Environment Research Council (NE/E00119X/1) and the IMAGES programme. A.M.G. and G.R. thank the MICINN (AP2004-7151 and AP2008-00801). F.P. acknowledges support from the National Science Foundation sponsored Center for Coastal Margin Observation and Prediction. S.R. was co-financed with Beatriu de Pinós (2006 BP-B1 00069) and Ramón y Cajal Contracts (RyC-2007-01327). A.R.M. acknowledges support from the European Commission Marie Curie-IOF (235626). Support for this work was furthermore provided by the MICINN as research funds (CTM2009-12214, CGL2008-03288-E, CGL2010-15000).
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file details PrahlFredrickCEOASCo-variationCrenarchaeolBranched.pdf 07/24/2017 Público
file details PrahlFredrickCEOASCo-variationCrenarchaeolBranched(Figures1-5).pdf 07/24/2017 Público