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Community structural differences shape microbial responses to high molecular weight organic matter
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Univ N Carolina, Dept Marine Sci, Chapel Hill, NC 27599 USA.ORCID iD: 0000-0001-5571-4893
Univ N Carolina, Dept Marine Sci, Chapel Hill, NC 27599 USA.
Univ N Carolina, Dept Marine Sci, Chapel Hill, NC 27599 USA.
Univ New Hampshire, Inst Study Earth Oceans & Space, Durham, NH 03824 USA.
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2019 (English)In: Environmental Microbiology, ISSN 1462-2912, E-ISSN 1462-2920, Vol. 21, no 2, p. 557-571Article in journal (Refereed) Published
Abstract [en]

The extent to which differences in microbial community structure result in variations in organic matter (OM) degradation is not well understood. Here, we tested the hypothesis that distinct marine microbial communities from North Atlantic surface and bottom waters would exhibit varying compositional succession and functional shifts in response to the same pool of complex high molecular weight (HMW-OM). We also hypothesized that microbial communities would produce a broader spectrum of enzymes upon exposure to HMW-OM, indicating a greater potential to degrade these compounds than reflected by initial enzymatic activities. Our results show that community succession in amended mesocosms was congruent with cell growth, increased bacterial production and most notably, with substantial shifts in enzymatic activities. In all amended mesocosms, closely related taxa that were initially rare became dominant at time frames during which a broader spectrum of active enzymes were detected compared to initial timepoints, indicating a similar response among different communities. However, succession on the whole-community level, and the rates, spectra and progression of enzymatic activities, reveal robust differences among distinct communities from discrete water masses. These results underscore the crucial role of rare bacterial taxa in ocean carbon cycling and the importance of bacterial community structure for HMW-OM degradation.

Place, publisher, year, edition, pages
John Wiley & Sons, 2019. Vol. 21, no 2, p. 557-571
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Microbiology
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URN: urn:nbn:se:uu:diva-379769DOI: 10.1111/1462-2920.14485ISI: 000459172700005PubMedID: 30452115OAI: oai:DiVA.org:uu-379769DiVA, id: diva2:1298036
Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-03-21Bibliographically approved

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Balmonte, John Paul

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