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The Response of Heterotrophic Prokaryote and Viral Communities to Labile Organic Carbon Inputs Is Controlled by the Predator Food Chain Structure.
Viruses. 2017 08 23; 9(9):
Publication Type
Journal Article
Research Support, Non-U.S. Gov't
Ruth-Anne Sandaa
Bernadette Pree
Aud Larsen
Selina Våge
Birte Töpper
Joachim P Töpper
Runar Thyrhaug
Tron Frede Thingstad
Author Affiliation
Department of Biology, University of Bergen, N-5020 Bergen, Norway.
Viruses. 2017 08 23; 9(9):
Publication Type
Journal Article
Research Support, Non-U.S. Gov't
Bacteria - growth & development - metabolism - virology
Bacteriophages - growth & development
Carbon - metabolism
Food chain
Heterotrophic Processes
Minerals - metabolism
Models, Theoretical
Multivariate Analysis
Prokaryotic Cells - metabolism - virology
Seawater - microbiology - virology
Water Microbiology
Factors controlling the community composition of marine heterotrophic prokaryotes include organic-C, mineral nutrients, predation, and viral lysis. Two mesocosm experiments, performed at an Arctic location and bottom-up manipulated 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 with mineral 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 experiments were in accordance with 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 the microbial food web and viral abundance and diversity.
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PubMed ID
28832530 View in PubMed
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