Cristin-resultat-ID: 1489464
Sist endret: 26. oktober 2017 13:14
NVI-rapporteringsår: 2017
Resultat
Vitenskapelig artikkel
2017

The response of heterotrophic prokaryote and viral communities to labile organic carbon inputs is controlled by the predator food chain structure

Bidragsytere:
  • Ruth-Anne Sandaa
  • Bernadette Pree
  • Aud Larsen
  • Selina Våge
  • Birte Tøpper
  • Joachim Paul Töpper
  • mfl.

Tidsskrift

Viruses
ISSN 1999-4915
e-ISSN 1999-4915
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2017
Publisert online: 2017
Volum: 9
Hefte: 9:238
Sider: 1 - 15
Open Access

Importkilder

Scopus-ID: 2-s2.0-85028375069

Klassifisering

Vitenskapsdisipliner

Zoologiske og botaniske fag

Finansiering

  • Norges forskningsråd

    • Prosjektkode: 175939
    • Prosjektkode: 225956
  • Andre

    • Prosjektkode: European Research Council Advanced Grant ERC-AG-LS8

Beskrivelse Beskrivelse

Tittel

The response of heterotrophic prokaryote and viral communities to labile organic carbon inputs is controlled by the predator food chain structure

Sammendrag

Factors controlling the community composition ofmarine heterotrophic prokaryotes include organic-C, mineral nutrients, predation, and viral lysis. Two mesocosm experiments, performed at an Arctic location and bottom-upmanipulated with organic-C, had very different results in community composition for both prokaryotes and viruses. Previously, we showed how a simple mathematical model could reproduce food web level dynamics observed in these mesocosms, demonstrating strong top-down control through the predator chain from copepods via ciliates and heterotrophic nanoflagellates. Here, we use a steady-state analysis to connect ciliate biomass to bacterial carbon demand. This gives a coupling of top-down and bottom-up factors whereby low initial densities of ciliates are associated withmineral nutrient-limited heterotrophic prokaryotes that do not respond to external supply of labile organic-C. In contrast, high initial densities of ciliates give carbon-limited growth and high responsiveness to organic-C. The differences observed in ciliate abundance, and in prokaryote abundance and community composition in the two experimentswere in accordancewith these predictions. Responsiveness in the viral community followed a pattern similar to that of prokaryotes. Our study provides a unique link between the structure of the predator chain in themicrobial food web and viral abundance and diversity. marine viral diversity; viral–host interaction; high latitude microbes; minimum food webmodel; copepods; ciliates; nutrient limitation; trophic cascade

Bidragsytere

Ruth-Anne Sandaa

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

Bernadette Pree

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

Aud Larsen

  • Tilknyttet:
    Forfatter
    ved Uni Research Miljø ved NORCE Norwegian Research Centre AS

Selina Våge

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

Birte Tøpper

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