Agulhas Current Properties Shape Microbial Community Diversity and Potential Functionality

Phoma, Sandra; Vikram, Surendra; Jansson, Janet K.; Ansorge, Isabelle J.; Cowan, Don A.; Van de Peer, Yves; Makhalanyane, Thulani P.

doi:10.1038/s41598-018-28939-0

Title: Agulhas Current Properties Shape Microbial Community Diversity and Potential Functionality

Journal Article · Thu Jul 12 00:00:00 EDT 2018 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-018-28939-0· OSTI ID:1491161

Phoma, Sandra ^[1]; Vikram, Surendra ^[1]; Jansson, Janet K. ^[2]; Ansorge, Isabelle J. ^[3]; Cowan, Don A. ^[1]; Van de Peer, Yves ^[4];

^[1]

Univ. of Pretoria (South Africa)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Univ. of Cape Town (South Africa)
Univ. of Pretoria (South Africa); VIB Centre for Plant Systems Biology, Ghent (Belgium); Ghent Univ. (Belgium)

Understanding the impact of oceanographic features on marine microbial ecosystems remains a major ecological endeavour. Here we assess microbial diversity, community structure and functional capacity along the Agulhas current system and the Subtropical convergence in the South Indian Ocean (SIO). Samples collected from the epipelagic, oxygen minimum and bathypelagic zones were analysed by 16S rRNA gene amplicon and metagenomic sequencing. In contrast to previous studies, we found high taxonomic richness in surface and deep water samples, but generally low richness for oxygen minimum zone communities. Beta-diversity analysis revealed significant dissimilarity between the three water depths. Most microbial communities were dominated by marine Gammaproteobacteria, with strikingly low levels of picocyanobacteria. Community composition was strongly influenced by specific environmental factors including depth, salinity, and the availability of both oxygen and light. Carbon, nitrogen and sulphur cycling capacity is the SIO was linked to several autotrophic and copiotrophic Alphaproteobacteria and Gammaproteobacteria. Taken together, our data suggest that the environmental conditions in the Agulhas current system, particularly depth-related parameters, substantially influence microbial community structure. While the capacity for biogeochemical cycling of nitrogen and sulphur is linked primarily by the dominant Gammaproteobacterial taxa, ecologically rare taxa drive carbon cycling.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1491161

Report Number(s):: PNNL-SA-135321

Journal Information:: Scientific Reports, Vol. 8, Issue 1; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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59 BASIC BIOLOGICAL SCIENCES
biogeochemistry
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carbon
sulphur
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Title: Agulhas Current Properties Shape Microbial Community Diversity and Potential Functionality

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