en
Scientific article
English

Influence of Methanogenic Populations in Holocene Lacustrine Sediments Revealed by Clone Libraries and Fatty Acid Biogeochemistry

Published inGeomicrobiology journal, vol. 31, no. 4, p. 285-298
Publication date2014
Abstract

Methanogenic populations were investigated in subsaline Laguna Potrok Aike sediments, southern Argentina.Microbial density and activity were assessed via cell count and in situ ATP detection for the last ∼11K years. Methanogen phylogenetics highlighted species stratification throughout depth, whereas CO2 reduction was the major pathway leading to methane production. Organic substrates, characterized using pore water analysis, bulk organic fractions and saturated fatty acids, showed a clear link between sediment colonization and initial organic sources. Concentrations and δ13C compositions of methane and fatty acids provided final evidence of a microbial imprint on Holocene organic proxies in the most colonized intervals.

Keywords
  • Early diagenesis
  • Fatty acids
  • Methanogenesis
  • Substrate fractionation
  • Syntrophy
Funding
  • Swiss National Science Foundation - 200020-119931/2
Citation (ISO format)
VUILLEMIN, Aurèle et al. Influence of Methanogenic Populations in Holocene Lacustrine Sediments Revealed by Clone Libraries and Fatty Acid Biogeochemistry. In: Geomicrobiology journal, 2014, vol. 31, n° 4, p. 285–298. doi: 10.1080/01490451.2013.824050
Main files (1)
Article (Published version)
accessLevelRestricted
Identifiers
ISSN of the journal0149-0451
25views
0downloads

Technical informations

Creation02/25/2014 9:11:00 PM
First validation02/25/2014 9:11:00 PM
Update time03/30/2023 10:19:11 AM
Status update03/30/2023 10:19:11 AM
Last indexation05/02/2024 1:53:27 PM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack