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Individual Physiological Adaptations Enable Selected Bacterial Taxa To Prevail during Long-Term Incubations
Leibniz Inst Baltic Sea Res Warnemunde, Rostock, Germany.;Estonian Univ Life Sci, Ctr Limnol, Elva Parish, Tartu County, Estonia..
Ernst Moritz Arndt Univ Greifswald, Inst Pharm, Dept Pharmaceut Biotechnol, Greifswald, Germany.;Inst Marine Biotechnol eV, Greifswald, Germany..
Leibniz Inst Baltic Sea Res Warnemunde, Rostock, Germany..
KTH, Centres, Science for Life Laboratory, SciLifeLab.ORCID iD: 0000-0002-3627-6899
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2019 (English)In: Applied and Environmental Microbiology, ISSN 0099-2240, E-ISSN 1098-5336, Vol. 85, no 15, article id UNSP e00825-19Article in journal (Refereed) Published
Abstract [en]

Enclosure experiments are frequently used to investigate the impact of changing environmental conditions on microbial assemblages. Yet, how the incubation itself challenges complex bacterial communities is thus far unknown. In this study, metaproteomic profiling, 16S rRNA gene analyses, and cell counts were combined to evaluate bacterial communities derived from marine, mesohaline, and oligohaline conditions after long-term batch incubations. Early in the experiment, the three bacterial communities were highly diverse and differed significantly in their compositions. Manipulation of the enclosures with terrigenous dissolved organic carbon resulted in notable differences compared to the control enclosures at this early phase of the experiment. However, after 55 days, bacterial communities in the manipulated and the control enclosures under marine and mesohaline conditions were all dominated by gammaproteobacterium Spongiibacter. In the oligohaline enclosures, actinobacterial cluster I of the hgc group (hgc-I) remained abundant in the late phase of the incubation. Metaproteome analyses suggested that the ability to use outer membrane-based internal energy stores, in addition to the previously described grazing resistance, may enable the gammaproteobacterium Spongiibacter to prevail in long-time incubations. Under oligohaline conditions, the utilization of external recalcitrant carbon appeared to be more important (hgc-I). Enclosure experiments with complex natural microbial communities are important tools to investigate the effects of manipulations. However, species-specific properties, such as individual carbon storage strategies, can cause manipulation-independent effects and need to be considered when interpreting results from enclosures. IMPORTANCE In microbial ecology, enclosure studies are often used to investigate the effect of single environmental factors on complex bacterial communities. However, in addition to the manipulation, unintended effects ("bottle effect") may occur due to the enclosure itself. In this study, we analyzed the bacterial communities that originated from three different salinities of the Baltic Sea, comparing their compositions and physiological activities both at the early stage and after 55 days of incubation. Our results suggested that internal carbon storage strategies impact the success of certain bacterial species, independent of the experimental manipulation. Thus, while enclosure experiments remain valid tools in environmental research, microbial community composition shifts must be critically followed. This investigation of the metaproteome during long-term batch enclosures expanded our current understanding of the so-called "bottle effect," which is well known to occur during enclosure experiments.

Place, publisher, year, edition, pages
AMER SOC MICROBIOLOGY , 2019. Vol. 85, no 15, article id UNSP e00825-19
Keywords [en]
Baltic Sea, bottle effect, Spongiibacter, enclosure, salinity
National Category
Ecology
Identifiers
URN: urn:nbn:se:kth:diva-256260DOI: 10.1128/AEM.00825-19ISI: 000478565000021PubMedID: 31152013Scopus ID: 2-s2.0-85070114651OAI: oai:DiVA.org:kth-256260DiVA, id: diva2:1365809
Note

QC 20191025

Available from: 2019-10-25 Created: 2019-10-25 Last updated: 2019-10-25Bibliographically approved

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Andersson, Anders F.de Bruijn, Ino

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