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Agulhas Current properties shape microbial community diversity and potential functionality

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Abstract
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 Front 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 OMZ 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 sulfur cycling capacity in 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. In addition, the capacity for biogeochemical cycling of nitrogen and sulfur is linked primarily to the dominant Gammaproteobacteria taxa, whereas ecologically rare taxa drive carbon cycling.
Keywords
SOUTHERN-OCEAN, BACTERIAL COMMUNITIES, ANTARCTIC PENINSULA, SALINITY, GRADIENT, MARINE BACTERIAL, COASTAL WATERS, BACTERIOPLANKTON, ARCHAEAL, SURFACE, CARBON

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MLA
Phoma, Sandra, et al. “Agulhas Current Properties Shape Microbial Community Diversity and Potential Functionality.” SCIENTIFIC REPORTS, vol. 8, 2018, doi:10.1038/s41598-018-28939-0.
APA
Phoma, S., Vikram, S., Jansson, J. K., Ansorge, I. J., Cowan, D. A., Van de Peer, Y., & Makhalanyane, T. P. (2018). Agulhas Current properties shape microbial community diversity and potential functionality. SCIENTIFIC REPORTS, 8. https://doi.org/10.1038/s41598-018-28939-0
Chicago author-date
Phoma, Sandra, Surendra Vikram, Janet K Jansson, Isabelle J Ansorge, Don A Cowan, Yves Van de Peer, and Thulani P Makhalanyane. 2018. “Agulhas Current Properties Shape Microbial Community Diversity and Potential Functionality.” SCIENTIFIC REPORTS 8. https://doi.org/10.1038/s41598-018-28939-0.
Chicago author-date (all authors)
Phoma, Sandra, Surendra Vikram, Janet K Jansson, Isabelle J Ansorge, Don A Cowan, Yves Van de Peer, and Thulani P Makhalanyane. 2018. “Agulhas Current Properties Shape Microbial Community Diversity and Potential Functionality.” SCIENTIFIC REPORTS 8. doi:10.1038/s41598-018-28939-0.
Vancouver
1.
Phoma S, Vikram S, Jansson JK, Ansorge IJ, Cowan DA, Van de Peer Y, et al. Agulhas Current properties shape microbial community diversity and potential functionality. SCIENTIFIC REPORTS. 2018;8.
IEEE
[1]
S. Phoma et al., “Agulhas Current properties shape microbial community diversity and potential functionality,” SCIENTIFIC REPORTS, vol. 8, 2018.
@article{8570740,
  abstract     = {{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 Front 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 OMZ 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 sulfur cycling capacity in 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. In addition, the capacity for biogeochemical cycling of nitrogen and sulfur is linked primarily to the dominant Gammaproteobacteria taxa, whereas ecologically rare taxa drive carbon cycling.}},
  articleno    = {{10542}},
  author       = {{Phoma, Sandra and Vikram, Surendra and Jansson, Janet K and Ansorge, Isabelle J and Cowan, Don A and Van de Peer, Yves and Makhalanyane, Thulani P}},
  issn         = {{2045-2322}},
  journal      = {{SCIENTIFIC REPORTS}},
  keywords     = {{SOUTHERN-OCEAN,BACTERIAL COMMUNITIES,ANTARCTIC PENINSULA,SALINITY,GRADIENT,MARINE BACTERIAL,COASTAL WATERS,BACTERIOPLANKTON,ARCHAEAL,SURFACE,CARBON}},
  language     = {{eng}},
  pages        = {{12}},
  title        = {{Agulhas Current properties shape microbial community diversity and potential functionality}},
  url          = {{http://doi.org/10.1038/s41598-018-28939-0}},
  volume       = {{8}},
  year         = {{2018}},
}

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