Comparison of Humic Substance- and Fe(III)-Reducing Microbial Communities in Anoxic Aquifers

Annette Piepenbrock, Sebastian Behrens, Andreas Kappler

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Humic substances can mediate electron transfer between microorganisms and Fe(III) minerals. Because it is unknown which microorganisms reduce humics in anoxic aquifers, we analyzed the diversity and physiological flexibility of Fe(III)-, humics-, and AQDS-reducers, which were present at up to 106 cells g−1. No significant differences in 16S rRNA gene based diversity were found between enrichment cultures reducing ferrihydrite, humics or AQDS. Even after repeated transfers many of the enrichments retained the ability to switch to other electron acceptors. This suggests that humics- and Fe(III)-reducing microorganisms in anoxic aquifers are rather versatile and able to reduce different extracellular electron acceptors.

Original languageEnglish (US)
Pages (from-to)917-928
Number of pages12
JournalGeomicrobiology Journal
Issue number10
StatePublished - Nov 26 2014


  • DGGE
  • Fe(III) reduction
  • electron shuttling
  • humic acids

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