Occurrence and abundance of soil-specific bacterial membrane lipid markers in the Tet watershed (southern France): Soil-specific BHPs and branched GDGTs

Jung-Hyun Kim, Helen M. Talbot, Barbara Zarzycka, Thorsten Bauersachs, Thomas Wagner

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Recently, four bacteriohopanepolyols (BHPs), adenosylhopane, and structurally similar adenosylhopane-type 1, 2-methyl adenosylhopane, and 2-methyl adenosylhopane-type 1, have been suggested to be characteristic of soil microbial communities and therefore can serve as molecular markers for soil organic matter (OM) supply in river, lake, and marine sediments. In this study, we analyzed BHPs in peats and soils collected in the Tet watershed (southern France) and compared them with branched glycerol dialkyl glycerol tetraethers (GDGTs), a more established molecular tracer of soil OM. Adenosylhopane-type I is identified in all of the samples from the study area except one collected near the Tet River mouth with up to three of the related compounds also frequently present, particularly in the surface samples. The concentrations of soil-specific BHPs in peat environments have been shown to increase with lower delta(15)N values, providing evidence that N(2)-fixing bacteria are probably a major source of soil-specific BHPs in acidic environments. It seems likely that soil pH is a major factor controlling BHP occurrence based on statistical analysis of environmental parameters and BHP concentration data. The comparison of the soil-specific BHP concentrations with those of branched GDGTs shows no clear relationship in the Tet River system, supporting the concept that these two groups of soil-specific compounds are synthesized by different microbial organisms living in different niches in the soil profile (e.g., oxic top versus anoxic deep).

Original languageEnglish
Article number02008
Number of pages15
JournalGeochemistry, Geophysics, Geosystems
Volume12
Issue number2
DOIs
Publication statusPublished - Feb 2011

Keywords

  • BHP
  • GDGT
  • bacterial membrane lipid
  • TRAP MASS-SPECTROMETRY
  • HOPANE SERIES
  • PROKARYOTIC TRITERPENOIDS
  • ORGANIC-MATTER
  • BACTERIOHOPANEPOLYOL SIGNATURES
  • INTACT BACTERIOHOPANEPOLYOLS
  • RHODOPSEUDOMONAS-ACIDOPHILA
  • METHANOTROPHIC BACTERIA
  • ZYMOMONAS-MOBILIS
  • BIOSYNTHESIS

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