Diversity and community composition of particle-associated and free-living bacteria in mesopelagic and bathypelagic Southern Ocean water masses: Evidence of dispersal limitation in the Bransfield Strait
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Authors
Milici, MathiasVital, Marius
Tomasch, Jürgen
Badewien, Thomas H.
Giebel, Helge A.
Plumeier, Iris
Wang, Hui
Pieper, Dietmar H.
Wagner-Döbler, Irene
Simon, Meinhard
Issue Date
2017-05-01
Metadata
Show full item recordAbstract
The Southern Ocean constitutes about 10% of the global oceans' volume and is characterized by high primary production. Particulate organic matter (POM) is exported from the photic zone to the deep ocean and sustains life of particle associated (PA) and free-living (FL) bacterial communities in the dark realm. Little is known about the composition and diversity of PA and FL bacterial communities below the photic zone and how they differ among various regions of the Southern Ocean. Therefore, we investigated the composition of small (3–8 μm) and large (> 8 μm) PA and FL (0.2–3 μm) bacterial communities between 500 m and 3600 m in the Bransfield Strait, Drake Passage, and the south Atlantic Ocean featuring also Southern Ocean water masses. PA bacterial communities had a higher OTU richness and evenness than FL ones. Taxonomic analysis revealed a different community composition between FL and PA bacteria. A large number of OTUs belonging to diverse phyla (Bacteroidetes, Planctomycetes, Betaproteobacteria, Deltaproteobacteria, and Verrucomicrobia) were significantly enriched on particles; in contrast very few bacterial lineages were FL specialists. Life-style (FL vs. PA) and region (Bransfield basin vs. other regions) strongly influenced bacterial communities. Depth explained only marginal fraction of the total variation (∼ 12%), suggesting that selective processes driven by depth have a smaller effect in the Southern Ocean when compared to life-style (25%) and region (31%). Overall these data indicate a strong influence of isolated water masses such as the basin of the Bransfield Strait on the composition of bacterial communities in the dark ocean. © 2017 The Authors Limnology and Oceanography published by Wiley Periodicals, Inc. on behalf of Association for the Sciences of Limnology and OceanographyAffiliation
HZI,Helmholtz-Zentrum für Infektionsforschung GmbH, Inhoffenstr. 7,38124 Braunschweig, Germany.Publisher
Wiley-BlackwellJournal
Limnology and OceanographyURI
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85012994395&origin=inwardhttp://hdl.handle.net/10033/621971
Type
ArticleLanguage
enSeries/Report no.
3ae974a485f413a2113503eed53cd6c53
10.1002/lno.10487
Scopus Count
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