Friederike Marie Luise Grundger

Geochemistry and Microbial Populations in Sediments of the Northern Baffin Bay, Arctic

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

  • Camelia Algora, Helmholtz-Zentrum für Umweltforschung GmbH
  • ,
  • Friederike Gründger
  • Lorenz Adrian, Helmholtz-Zentrum für Umweltforschung GmbH
  • ,
  • Volkmar Damm, Federal Institute for Geosciences and Natural Resources
  • ,
  • Hans Hermann Richnow, Helmholtz-Zentrum für Umweltforschung GmbH
  • ,
  • Martin Krüger, Federal Institute for Geosciences and Natural Resources

The Northern Baffin Bay between Greenland and Canada is a remote Arctic area restricted in primary production by seasonal ice cover, with presumably low sedimentation rates, carbon content and microbial activities in its sediments. Our aim was to study the so far unknown subseafloor geochemistry and microbial populations driving seafloor ecosystems. Shelf sediments had the highest organic carbon content, numbers of Bacteria and Archaea, and microcosms inoculated from Shelf sediments showed highest sulfate reduction and methane production rates. Sediments in the central deep area and on the southern slope contained less organic carbon and overall lower microbial numbers. Similar 16S rRNA gene copy numbers of Archaea and Bacteria were found for the majority of the sites investigated. Sulfate in pore water correlated with dsrA copy numbers of sulfate-reducing prokaryotes and differed between sites. No methane was found as free gas in the sediments, and mcrA copy numbers of methanogenic Archaea were low. Methanogenic and sulfate-reducing cultures were enriched on a variety of substrates including hydrocarbons. In summary, the Greenlandic shelf sediments contain vital microbial communities adapted to their specific environmental conditions.

TidsskriftGeomicrobiology Journal
Sider (fra-til)690-705
Antal sider16
StatusUdgivet - 1 sep. 2013
Eksternt udgivetJa

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