Occurrence and distribution of glycerol dialkanol diethers and glycerol dialkyl glycerol tetraethers in a peat core from SW Tanzania |
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| Institution: | 1. CNRS, UMR 7619, METIS, F-75005 Paris, France;2. Sorbonne Universités, UPMC Univ. Paris 06, UMR 7619, METIS, F-75005 Paris, France;3. Institut de Recherche pour le Développement, UMR 7159, LOCEAN, Centre IRD France Nord, F-93143 Bondy Cedex, France;4. CNRS-UPS UMR 8148, GEOPS, F-91405 Orsay, France;5. Institute of Resource Assessment, University of Dar Es Salaam, PO Box 35097, Dar Es Salaam, Tanzania;1. Organic Geochemistry Group, MARUM – Center for Marine Environmental Sciences & Department of Geosciences, University of Bremen, 28359 Bremen, Germany;2. Max Planck Institute for Marine Microbiology, Celsiusstraße 1, 28359 Bremen, Germany;1. Organic Geochemistry Group, MARUM – Center for Marine Environmental Sciences & Department of Geosciences, University of Bremen, 28359 Bremen, Germany;2. Lehrstuhl für Mikrobiologie und Archaeenzentrum, Universität Regensburg, 93053 Regensburg, Germany;1. Department of Environmental Sciences, University of Basel, Bernoullistrasse 30, 4056 Basel, Switzerland;2. Department of Marine Organic Biogeochemistry, NIOZ Royal Netherlands Institute for Sea Research, P.O. Box 59, 1790 AB Den Burg, Texel, The Netherlands;3. Eawag, Swiss Federal Institute of Aquatic Science and Technology, Department of Surface Waters – Research and Management, Seestrasse 79, 6047 Kastanienbaum, Switzerland;4. Utrecht University, Faculty of Geosciences, P.O. Box 80.021, 3508 TA Utrecht, The Netherlands;1. Sorbonne Universités, UPMC, Univ Paris 06, CNRS, EPHE, UMR 7619 METIS, 4, place Jussieu, 75252 Paris Cedex 05, France;2. MARUM Center for Marine Environmental Sciences and Dept. of Geosciences, University of Bremen, 28359 Bremen, Germany;3. ISTO, CNRS/Université d’Orléans/BRGM UMR 7327, Orléans F-45071, France;1. Utrecht University, Department of Earth Sciences, Princetonlaan 8A, Utrecht 3584CB, the Netherlands;2. University of Arizona, Department of Geosciences, 1040 E 4th St, Tucson, AZ 85721, United States;3. NIOZ Royal Netherlands Institute for Sea Research, Department of Marine Microbiology and Biogeochemistry, and Utrecht University, Den Burg 1790 AB, Texel, the Netherlands |
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| Abstract: | Isoprenoid and branched glycerol dialkanol diethers (iso GDDs and br GDDs) have recently been detected in various environments, including sediment, soil and peat deposits. Their structures strongly resemble those of glycerol dialkyl glycerol tetraethers (GDGTs). Nevertheless, the origin of GDDs and their link to GDGTs remain unclear. Here we examined the concentration and distribution of iso GDDs and br GDDs, together with those of iso GDGTs and br GDGTs along a 4 m peat core from Tanzania. Whereas br GDDs have only been detected to date in their core lipid (CL) form, we report here, for the first time, br GDDs in both CL and intact polar lipid (IPL) forms, suggesting a biosynthetic origin for br GDDs. Concentrations of br GDGTs and br GDDs on one hand and of iso GDGTs and iso GDDs on the other hand, were observed to significantly co-vary (R2 0.49–0.58; p < 0.05), both for the CL and IPL fractions. Moreover, the fractional abundance of each GDD correlated significantly with that of its GDGT analogue (R2 0.33–0.97; p < 0.05). Taken together, the data show that GDDs and GDGTs are closely related and likely take part in common metabolic pathways, although the hypothesis of GDDs being degradation products of GDGTs cannot be excluded. |
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| Keywords: | GDGTs GDDs Peat core Tanzania |
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