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Effects of predation stress and food ration on perch gut microbiota
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden.; eDNA Solut Ltd, Molndal, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
2018 (English)In: Microbiome, ISSN 0026-2633, E-ISSN 2049-2618, Vol. 6, article id 28Article in journal (Refereed) Published
Abstract [en]

Background: Gut microbiota provide functions of importance to influence hosts' food digestion, metabolism, and protection against pathogens. Factors that affect the composition and functions of gut microbial communities are well studied in humans and other animals; however, we have limited knowledge of how natural food web factors such as stress from predators and food resource rations could affect hosts' gut microbiota and how it interacts with host sex. In this study, we designed a two-factorial experiment exposing perch (Perca fluviatilis) to a predator (pike, Esox lucius), and different food ratios, to examine the compositional and functional changes of perch gut microbiota based on 16S rRNA amplicon sequencing. We also investigated if those changes are host sex dependent.

Results: We showed that overall gut microbiota composition among individual perch significantly responded to food ration and predator presence. We found that species richness decreased with predator presence, and we identified 23 taxa from a diverse set of phyla that were over-represented when a predator was present. For example, Fusobacteria increased both at the lowest food ration and at predation stress conditions, suggesting that Fusobacteria are favored by stressful situations for the host. In concordance, both food ration and predation stress seemed to influence the metabolic repertoire of the gut microbiota, such as biosynthesis of other secondary metabolites, metabolism of cofactors, and vitamins. In addition, the identified interaction between food ration and sex emphasizes sex-specific responses to diet quantity in gut microbiota.

Conclusions: Collectively, our findings emphasize an alternative state in gut microbiota with responses to changes in natural food webs depending on host sex. The obtained knowledge from this study provided us with an important perspective on gut microbiota in a food web context.

Place, publisher, year, edition, pages
2018. Vol. 6, article id 28
National Category
Microbiology Ecology
Identifiers
URN: urn:nbn:se:uu:diva-341520DOI: 10.1186/s40168-018-0400-0ISI: 000424692400001PubMedID: 29409543OAI: oai:DiVA.org:uu-341520DiVA, id: diva2:1181848
Funder
Swedish Research Council, VR-2011-05646, VR-2012-4592Swedish Foundation for Strategic Research , ICA10-0015Available from: 2018-02-09 Created: 2018-02-09 Last updated: 2018-03-28Bibliographically approved

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