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Contribution of different dispersal sources to the metabolic response of lake bacterioplankton following a salinity change
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Environm & Climate Change Canada, Canada Ctr Inland Waters, Watershed Hydrol & Ecol Res Div, Water Sci & Technol, Burlington, ON L7S 1A1, Canada..
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. Leibniz Inst Balt Sea Res, Biol Oceanog, Seestr 15, D-18119 Rostock, Germany..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
2017 (English)In: Environmental Microbiology, ISSN 1462-2912, E-ISSN 1462-2920, Vol. 19, no 1, 251-260 p.Article in journal (Refereed) Published
Abstract [en]

Dispersal can modify how bacterial community composition (BCC) changes in response to environmental perturbations, yet knowledge about the functional consequences of dispersal is limited. Here we hypothesize that changes in bacterial community production in response to a salinity disturbance depend on the possibility to recruit cells from different dispersal sources. To investigate this, we conducted an in situ mesocosm experiment where bacterial communities of an oligotrophic lake were exposed to different salinities (0, 18, 36 psu) for two weeks and subjected to dispersal of cells originating from sediments, air (mesocosms open to air deposition), both or none. BCC was determined using 454 pyrosequencing of the 16S rRNA gene and bacterial production was measured by 3H leucine uptake. Bacterial production differed significantly among salinity treatments and dispersal treatments, being highest at high salinity. These changes were associated with changes in BCC and it was found that the identity of the main functional contributors differed at different salinities. Our results further showed that after a salinity perturbation, the response of bacterial communities depended on the recruitment of taxa, including marine representatives (e.g. Alphaproteobacteria Loktanella, Erythrobacter and the Gammaproteobacterium Rheiheimera) from dispersal sources, in which atmospheric deposition appeared to play a major role.

Place, publisher, year, edition, pages
2017. Vol. 19, no 1, 251-260 p.
National Category
Microbiology Oceanography, Hydrology, Water Resources
Identifiers
URN: urn:nbn:se:uu:diva-309470DOI: 10.1111/1462-2920.13593ISI: 000393587200028PubMedID: 27871136OAI: oai:DiVA.org:uu-309470DiVA: diva2:1051904
Funder
Knut and Alice Wallenberg FoundationScience for Life Laboratory - a national resource center for high-throughput molecular bioscienceWenner-Gren FoundationsHelge Ax:son Johnsons stiftelse Swedish Research Council, 2009-5172Swedish Research Council Formas
Available from: 2016-12-05 Created: 2016-12-05 Last updated: 2017-03-31Bibliographically approved

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