Sulfide fluxes in a microbial mat from the Ebro Delta, Spain

Joan Mir, Maira Martínez-Alonso, Pierre Caumette, Ricardo Guerrero, Isabel Esteve

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8 Citations (Scopus)

Abstract

The sulfur cycle of Ebro Delta microbial mats was studied in order to determine sulfide production and sulfide consumption. Vertical distribution of two major functional groups involved in the sulfur cycle, anoxygenic phototrophic bacteria and dissimilatory sulfate-reducing bacteria (SRB), was also studied. The former reached up to 2.2×108 cfu cm -3 sediment in the purple layer, and the latter reached about 1.8×105 SRB cm-3 sediment in the black layer. From the changes in sulfide concentrations under light-dark cycles it can be inferred that the rate of H2S production was 6.2 μmol H2S cm-3 day-1 at 2.6 mm, and 7.6 μmol H2S cm-3 day-1 at 6 mm. Furthermore, sulfide consumption was also assessed, determining rates of 0.04, 0.13 and 0.005 mmol I-1 of sulfide oxidized at depths of 2.6, 3 and 6 mm, respectively. © Springer-Verlag and SEM 2002.
Original languageEnglish
Pages (from-to)133-138
JournalInternational Microbiology
Volume5
DOIs
Publication statusPublished - 1 Jan 2002

Keywords

  • Microbial mats
  • Sulfate reduction
  • Sulfide oxidation

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