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dc.contributor.authorSandaa, Ruth-Anne
dc.contributor.authorPree, Bernadette
dc.contributor.authorLarsen, Aud
dc.contributor.authorVåge, Selina
dc.contributor.authorTøpper, Birte
dc.contributor.authorTöpper, Joachim Paul
dc.contributor.authorThyrhaug, Runar
dc.contributor.authorThingstad, T. Frede
dc.description.abstractFactors 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 cascadenb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.subjectmarine viral diversitynb_NO
dc.subjectviral–host interactionnb_NO
dc.subjecthigh latitude microbesnb_NO
dc.subjectminimum food webmodelnb_NO
dc.subjectnutrient limitationnb_NO
dc.subjecttrophic cascadenb_NO
dc.titleThe Response of Heterotrophic Prokaryote and Viral Communities to Labile Organic Carbon Inputs Is Controlled by the Predator Food Chain Structurenb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.subject.nsiVDP::Zoologiske og botaniske fag: 480nb_NO
dc.subject.nsiVDP::Zoology and botany: 480nb_NO
dc.relation.projectNorges forskningsråd: 175939nb_NO
dc.relation.projectAndre: European Research Council Advanced Grant ERC-AG-LS8nb_NO
dc.relation.projectNorges forskningsråd: 225956nb_NO

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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal