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Atmospheric Deposition Impact on Bacterial Community Composition in the NW Mediterranean
CSIC, Inst Ciencies Mar, Barcelona, Spain.;Univ Algarve, Ctr Ciencias Mar Algarve CCMAR, Faro, Portugal..
Lund Univ, Dept Biol Aquat Ecol, Lund, Sweden.;Linnaeus Univ, Ctr Ecol & Evolut Microbial Model Syst EEMiS, Kalmar, Sweden..
KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Gene Technology.ORCID iD: 0000-0002-3627-6899
CSIC, Inst Ciencies Mar, Barcelona, Spain..
2019 (English)In: Frontiers in Microbiology, ISSN 1664-302X, E-ISSN 1664-302X, Vol. 10, article id 858Article in journal (Refereed) Published
Abstract [en]

Atmospheric deposition is a source of inorganic nutrients and organic matter to the ocean, and can favor the growth of some planktonic species over others according to their nutrient requirements. Atmospheric inputs from natural and anthropogenic sources are nowadays increasing due to desertification and industrialization, respectively. While the impact of mineral dust (mainly from the Saharan desert) on phytoplankton and bacterial community composition has been previously assessed, the effect of anthropogenic aerosols on marine bacterial assemblages remains poorly studied. Since marine bacteria play a range of roles in the biogeochemical cycles of inorganic nutrients and organic carbon, it is important to determine which taxa of marine bacteria may benefit from aerosol fertilization and which not. Here, we experimentally assessed the effect of Saharan dust and anthropogenic aerosols on marine bacterioplankton community composition across a spatial and temporal range of trophic conditions in the northwestern Mediterranean Sea. Results from 16S rDNA sequencing showed that bacterial diversity varied significantly with seasonality and geographical location. While atmospheric deposition did not yield significant changes in community composition when all the experiments where considered together, it did produce changes at certain places and during certain times of the year. These effects accounted for shifts in the bacterial community's relative abundance of up to 28%. The effect of aerosols was overall greatest in summer, both types of atmospheric particles stimulating the groups Alphaproteobacteria, Betaproteobacteria, and Cyanobacteria in the location with the highest anthropogenic footprint. Other bacterial groups benefited from one or the other aerosol depending on the season and location. Anthropogenic aerosols increased the relative abundance of groups belonging to the phylum Bacteriodetes (Cytophagia, Flavobacteriia, and Sphingobacteriia), while Saharan dust stimulated most the phytoplanktonic group of Cyanobacteria and, more specifically, Synechococcus.

Place, publisher, year, edition, pages
FRONTIERS MEDIA SA , 2019. Vol. 10, article id 858
Keywords [en]
atmospheric deposition, Saharan dust, anthropogenic aerosols, bacterial community composition, 454-pyrosequenciation, Mediterranean Sea
National Category
Ecology
Identifiers
URN: urn:nbn:se:kth:diva-251274DOI: 10.3389/fmicb.2019.00858ISI: 000465418200001Scopus ID: 2-s2.0-85068103547OAI: oai:DiVA.org:kth-251274DiVA, id: diva2:1315258
Note

QC 20190513

Available from: 2019-05-13 Created: 2019-05-13 Last updated: 2019-10-04Bibliographically approved

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