Cristin-resultat-ID: 1442055
Sist endret: 10. august 2017 16:26
Resultat
Poster
2017

How permafrost organic matter input in an Arctic fjord alters the bacterial community structure

Bidragsytere:
  • Oliver Müller
  • Lise Øvreås
  • Gunnar Bratbak
  • Aud Larsen
  • Maria Lund Paulsen og
  • Lena Seuthe

Konferanse

Tittel: Arctic Frontiers 2017

Sted:

Tromsø
Norge
Utbredelsesområde: Internasjonalt
Årstall: 2017
Dato fra: 22. januar 2017
Dato til: 27. januar 2017

Om resultatet

Poster
Publiseringsår: 2017
Fagfellevurdert

Finansiering

  • Norges forskningsråd
    Prosjektkode: 225956
  • Norges forskningsråd
    Prosjektkode: 227062

Beskrivelse Beskrivelse

Tittel

How permafrost organic matter input in an Arctic fjord alters the bacterial community structure

Sammendrag

Climatic changes have severe impact in the Arctic where permafrost is melting, glaciers are receding and sea ice is disappearing. This results in an increased wash out of vast amounts of dissolved organic matter (DOM) into the Arctic Ocean. Only few studies have addressed the impact of terrigenous DOM (tDOM) on the structure and dynamics of marine microbial communities in marine systems influenced by run-off. In this study we aim to highlight the spatio-temporal effects of tDOM addition on the activity and structure of marine and fjord prokaryotic communities in the Arctic. A specific focus is placed on defining a time line of changes of the active community as well as the degradation potential of terrigenous DOM (tDOM) by marine Arctic bacteria. tDOM isolated from Svalbard permafrost soil, was added to 16 different bacterial communities from contrasting water masses Northwest of Svalbard (August and November 2014) and to bacterial communities from an Arctic fjord system (Kongsfjord, Ny Ålesund, July 2015). The samples were incubated for up to 9 days and were stopped in regular intervals to monitor short term responses of the bacterial community. Communities from all water masses showed immediate but different responses in diversity and activity upon tDOM addition. Increased bacterial production and net-growth was observed together with increased abundance of the genera Oleispira and Marinomonas within the class Gammaproteobacteria in deep Atlantic intermediate water and the genus Glaciecola in fjord samples. Relative abundance of Glaciecola increased more than 100-fold within 48h after tDOM additions. However, bacterial community compositions in Atlantic and Arctic surface water did not show any measurable response to the tDOM addition. Our results indicate that tDOM can be quickly utilized by some Arctic marine bacterial communities and thereby alter both their net-growth and composition within 24 hours. However, further studies are needed to unravel the factors controlling the degradation potential of tDOM by different bacterial communities, which ultimately determine the fate of terrigenous carbon washed out into marine ecosystems and the possible impact on the Arctic microbial food web.

Bidragsytere

Oliver Müller

  • Tilknyttet:
    Forfatter
    ved Institutt for biovitenskap ved Universitetet i Bergen

Lise Øvreås

  • Tilknyttet:
    Forfatter
    ved Institutt for biovitenskap ved Universitetet i Bergen

Gunnar Bratbak

  • Tilknyttet:
    Forfatter
    ved Institutt for biovitenskap ved Universitetet i Bergen

Aud Larsen

  • Tilknyttet:
    Forfatter
    ved Institutt for biovitenskap ved Universitetet i Bergen

Maria Lund Paulsen

  • Tilknyttet:
    Forfatter
    ved Institutt for biovitenskap ved Universitetet i Bergen
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