Artículo

Vuillemin, A.; Ariztegui, D.; Leavitt, P.R.; Bunting, L.; Anselmetti, F.; Ariztegui, D.; Corbella, H.; Francus, P.; Lücke, A.; Maidana, N.I.; Ohlendorf, C.; Schäbitz, F.; Wastegård, S.; Zolitschka, B. "Recording of climate and diagenesis through sedimentary DNA and fossil pigments at Laguna Potrok Aike, Argentina" (2016) Biogeosciences. 13(8):2475-2492
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Abstract:

Aquatic sediments record past climatic conditions while providing a wide range of ecological niches for microorganisms. In theory, benthic microbial community composition should depend on environmental features and geochemical conditions of surrounding sediments, as well as ontogeny of the subsurface environment as sediment degraded. In principle, DNA in sediments should be composed of ancient and extant microbial elements persisting at different degrees of preservation, although to date few studies have quantified the relative influence of each factor in regulating final composition of total sedimentary DNA assemblage. Here geomicrobiological and phylogenetic analyses of a Patagonian maar lake were used to indicate that the different sedimentary microbial assemblages derive from specific lacustrine regimes during defined climatic periods. Two climatic intervals (Mid-Holocene, 5 ka BP; Last Glacial Maximum, 25 ka BP) whose sediments harbored active microbial populations were sampled for a comparative environmental study based on fossil pigments and 16S rRNA gene sequences. The genetic assemblage recovered from the Holocene record revealed a microbial community displaying metabolic complementarities that allowed prolonged degradation of organic matter to methane. The series of Archaea identified throughout the Holocene record indicated an age-related stratification of these populations brought on by environmental selection during early diagenesis. These characteristics were associated with sediments resulting from endorheic lake conditions and stable pelagic regime, high evaporative stress and concomitant high algal productivity. In contrast, sulphate-reducing bacteria and lithotrophic Archaea were predominant in sediments dated from the Last Glacial Maximum, in which pelagic clays alternated with fine volcanic material characteristic of a lake level highstand and freshwater conditions, but reduced water column productivity. Comparison of sedimentary DNA composition with that of fossil pigments suggested that post-depositional diagenesis resulted in a rapid change in the initial nucleic acid composition and overprint of phototrophic communities by heterotrophic assemblages with preserved pigment compositions. Long DNA sequences (1400-900 bp) appeared to derive from intact bacterial cells, whereas short fragments (290-150 bp) reflected extracellular DNA accumulation in ancient sediments. We conclude that sedimentary DNA obtained from lacustrine deposits provides essential genetic information to complement paleoenvironmental indicators and trace post-depositional diagenetic processes over tens of millennia. However, it remains difficult to estimate the time lag between original deposition of lacustrine sediments and establishment of the final composition of the sedimentary DNA assemblage. © Author(s) 2016.

Registro:

Documento: Artículo
Título:Recording of climate and diagenesis through sedimentary DNA and fossil pigments at Laguna Potrok Aike, Argentina
Autor:Vuillemin, A.; Ariztegui, D.; Leavitt, P.R.; Bunting, L.; Anselmetti, F.; Ariztegui, D.; Corbella, H.; Francus, P.; Lücke, A.; Maidana, N.I.; Ohlendorf, C.; Schäbitz, F.; Wastegård, S.; Zolitschka, B.
Filiación:GFZ German Research Centre for Geosciences, Section 5.3 Geomicrobiology, Potsdam, 14473, Germany
Department of Earth Sciences, University of Geneva, Geneva, 1205, Switzerland
Limnology Laboratory, Department of Biology, University of Regina, Regina, SK S4S 0A2, Canada
Institute of Environmental Change and Society, University of Regina, Regina, SK S4S 0A2, Canada
Institute of Geological Sciences, Quaternary Geology, University of Bern, Bern, 3012, Switzerland
Museo Argentino de Ciencias Naturales Bernardino Rivadavia, Buenos Aires, C1405, Argentina
Centre Eau Terre Environnement, Institut National de la Recherche ScientifiqueQC G1K 9A9, Canada
Forschungszentrum Jülich IBG-3, Jülich, 52428, Germany
Facultad de Ciencias Exactas y Naturales, University of Buenos Aires, Buenos Aires, C1428EGA, Argentina
GEOPOLAR, Institute of Geography, University of Bremen, Bremen, 28359, Germany
Seminar für Geographie und ihre Didaktik, University of Cologne, Cologne, 50931, Germany
Department of Physical Geography and Quaternary Geology, Stockholm University, Stockholm, 10691, Sweden
Palabras clave:bacterium; community composition; diagenesis; DNA; fossil record; geomicrobiology; heterotrophy; Holocene; lacustrine deposit; Last Glacial Maximum; maar; microbial community; organic matter; paleoclimate; paleoenvironment; Argentina; Laguna Potrok Aike; Patagonia; Santa Cruz [Argentina]; algae; Bacteria (microorganisms)
Año:2016
Volumen:13
Número:8
Página de inicio:2475
Página de fin:2492
DOI: http://dx.doi.org/10.5194/bg-13-2475-2016
Título revista:Biogeosciences
Título revista abreviado:Biogeosciences
ISSN:17264170
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17264170_v13_n8_p2475_Vuillemin

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Citas:

---------- APA ----------
Vuillemin, A., Ariztegui, D., Leavitt, P.R., Bunting, L., Anselmetti, F., Ariztegui, D., Corbella, H.,..., Zolitschka, B. (2016) . Recording of climate and diagenesis through sedimentary DNA and fossil pigments at Laguna Potrok Aike, Argentina. Biogeosciences, 13(8), 2475-2492.
http://dx.doi.org/10.5194/bg-13-2475-2016
---------- CHICAGO ----------
Vuillemin, A., Ariztegui, D., Leavitt, P.R., Bunting, L., Anselmetti, F., Ariztegui, D., et al. "Recording of climate and diagenesis through sedimentary DNA and fossil pigments at Laguna Potrok Aike, Argentina" . Biogeosciences 13, no. 8 (2016) : 2475-2492.
http://dx.doi.org/10.5194/bg-13-2475-2016
---------- MLA ----------
Vuillemin, A., Ariztegui, D., Leavitt, P.R., Bunting, L., Anselmetti, F., Ariztegui, D., et al. "Recording of climate and diagenesis through sedimentary DNA and fossil pigments at Laguna Potrok Aike, Argentina" . Biogeosciences, vol. 13, no. 8, 2016, pp. 2475-2492.
http://dx.doi.org/10.5194/bg-13-2475-2016
---------- VANCOUVER ----------
Vuillemin, A., Ariztegui, D., Leavitt, P.R., Bunting, L., Anselmetti, F., Ariztegui, D., et al. Recording of climate and diagenesis through sedimentary DNA and fossil pigments at Laguna Potrok Aike, Argentina. Biogeosciences. 2016;13(8):2475-2492.
http://dx.doi.org/10.5194/bg-13-2475-2016