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Linking internal and external bacterial community control gives mechanistic framework for pelagic virus‐to‐bacteria ratios

For more than 25 years, virus‐to‐bacteria ratios (VBR) have been measured and interpreted as indicators of the importance of viruses in aquatic ecosystems, yet a generally accepted theory for understanding mechanisms controlling VBR is still lacking. Assuming that the denominator (total bacterial ab...

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Autores principales: Våge, Selina, Pree, Bernadette, Thingstad, T. Frede
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5132033/
https://www.ncbi.nlm.nih.gov/pubmed/27231817
http://dx.doi.org/10.1111/1462-2920.13391
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author Våge, Selina
Pree, Bernadette
Thingstad, T. Frede
author_facet Våge, Selina
Pree, Bernadette
Thingstad, T. Frede
author_sort Våge, Selina
collection PubMed
description For more than 25 years, virus‐to‐bacteria ratios (VBR) have been measured and interpreted as indicators of the importance of viruses in aquatic ecosystems, yet a generally accepted theory for understanding mechanisms controlling VBR is still lacking. Assuming that the denominator (total bacterial abundance) is primarily predator controlled, while viral lysis compensates for host growth rates exceeding this grazing loss, the numerator (viral abundance) reflects activity differences between prokaryotic hosts. VBR is then a ratio between mechanisms generating structure within the bacterial community and interactions between different plankton functional types controlling bacterial community size. We here show how these arguments can be formalized by combining a recently published model for co‐evolutionary host‐virus interactions, with a previously published “minimum” model for the microbial food web. The result is a framework where viral lysis links bacterial diversity to microbial food web structure and function, creating relationships between different levels of organization that are strongly modified by organism‐level properties such as cost of resistance.
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spelling pubmed-51320332016-12-02 Linking internal and external bacterial community control gives mechanistic framework for pelagic virus‐to‐bacteria ratios Våge, Selina Pree, Bernadette Thingstad, T. Frede Environ Microbiol Research Articles For more than 25 years, virus‐to‐bacteria ratios (VBR) have been measured and interpreted as indicators of the importance of viruses in aquatic ecosystems, yet a generally accepted theory for understanding mechanisms controlling VBR is still lacking. Assuming that the denominator (total bacterial abundance) is primarily predator controlled, while viral lysis compensates for host growth rates exceeding this grazing loss, the numerator (viral abundance) reflects activity differences between prokaryotic hosts. VBR is then a ratio between mechanisms generating structure within the bacterial community and interactions between different plankton functional types controlling bacterial community size. We here show how these arguments can be formalized by combining a recently published model for co‐evolutionary host‐virus interactions, with a previously published “minimum” model for the microbial food web. The result is a framework where viral lysis links bacterial diversity to microbial food web structure and function, creating relationships between different levels of organization that are strongly modified by organism‐level properties such as cost of resistance. John Wiley and Sons Inc. 2016-07-05 2016-11 /pmc/articles/PMC5132033/ /pubmed/27231817 http://dx.doi.org/10.1111/1462-2920.13391 Text en © 2016 The Authors. Environmental Microbiology Reports published by Society for Applied Microbiology and John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs (http://creativecommons.org/licenses/by-nc-nd/4.0/) License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
spellingShingle Research Articles
Våge, Selina
Pree, Bernadette
Thingstad, T. Frede
Linking internal and external bacterial community control gives mechanistic framework for pelagic virus‐to‐bacteria ratios
title Linking internal and external bacterial community control gives mechanistic framework for pelagic virus‐to‐bacteria ratios
title_full Linking internal and external bacterial community control gives mechanistic framework for pelagic virus‐to‐bacteria ratios
title_fullStr Linking internal and external bacterial community control gives mechanistic framework for pelagic virus‐to‐bacteria ratios
title_full_unstemmed Linking internal and external bacterial community control gives mechanistic framework for pelagic virus‐to‐bacteria ratios
title_short Linking internal and external bacterial community control gives mechanistic framework for pelagic virus‐to‐bacteria ratios
title_sort linking internal and external bacterial community control gives mechanistic framework for pelagic virus‐to‐bacteria ratios
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5132033/
https://www.ncbi.nlm.nih.gov/pubmed/27231817
http://dx.doi.org/10.1111/1462-2920.13391
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