Department of Biology

Aarhus University Seal / Aarhus Universitets segl

Bo Barker Jørgensen

Biogeochemistry and microbiology of high Arctic marine sediment ecosystems-Case study of Svalbard fjords

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DOI

  • Bo Barker Jorgensen
  • Katja Laufer, GEOMAR Helmholtz Centre for Ocean Research
  • ,
  • Alexander B. Michaud, Bigelow Laboratory for Ocean Sciences
  • ,
  • Laura M. Wehrmann, Stony Brook University

Fjord ecosystems of the high Arctic are distinct from fjords of temperate latitudes due to the influence of glaciers, icebergs, sea ice, and the permanently low temperatures. The sediment microbiology and biogeochemical processes were analyzed during an international research program with multiple field studies in Svalbard, situated between the Barents Sea and the Arctic Ocean. We here describe the physical and geochemical setting and the predominant microbiological processes in several fjords. Physiological studies of sediments and pure cultures show how the predominantly psychrophilic bacteria are adapted to the near-zero temperature. The microbial communities include bacteria responsible for organic matter hydrolytic degradation, fermentation, and terminal oxidation to CO2. These processes drive the cycling of carbon, sulfur, iron, and manganese. The balance between the dominant sediment microbial processes changes along transects out through the fjords, reflecting the varying impact of the glacier-derived rock flour, rich in metal oxides at the head, and the plankton-derived, labile, marine organic matter at the mouth. Due to accelerated warming of Arctic ecosystems, glaciers are retreating with impacts on the physical, chemical, and biological functioning of the fjord sediment ecosystems.

Original languageEnglish
JournalLimnology and Oceanography
Volume66
IssueS1
Pages (from-to)S273-S292
Number of pages20
ISSN0024-3590
DOIs
Publication statusPublished - Jan 2021

    Research areas

  • SULFATE-REDUCING BACTERIA, FILAMENTOUS SULFUR BACTERIA, ORGANIC-CARBON BURIAL, SP NOV., TEMPERATURE-DEPENDENCE, COMMUNITY STRUCTURE, DESULFOTALEA-PSYCHROPHILA, THERMOPHILIC BACTERIA, TIDEWATER GLACIERS, FE(III) REDUCTION

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