Agulhas Current Properties Shape Microbial Community Diversity and Potential Functionality
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 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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1491161
- Report Number(s):
- PNNL-SA-135321
Journal ID: ISSN 2045-2322
- Grant/Contract Number:
- AC05-76RL01830
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; biogeochemistry; nitrogen; carbon; sulphur; Agulhas current
Citation Formats
Phoma, Sandra, Vikram, Surendra, Jansson, Janet K., Ansorge, Isabelle J., Cowan, Don A., Van de Peer, Yves, and Makhalanyane, Thulani P. Agulhas Current Properties Shape Microbial Community Diversity and Potential Functionality. United States: N. p., 2018.
Web. doi:10.1038/s41598-018-28939-0.
Phoma, Sandra, Vikram, Surendra, Jansson, Janet K., Ansorge, Isabelle J., Cowan, Don A., Van de Peer, Yves, & Makhalanyane, Thulani P. Agulhas Current Properties Shape Microbial Community Diversity and Potential Functionality. United States. https://doi.org/10.1038/s41598-018-28939-0
Phoma, Sandra, Vikram, Surendra, Jansson, Janet K., Ansorge, Isabelle J., Cowan, Don A., Van de Peer, Yves, and Makhalanyane, Thulani P. Thu .
"Agulhas Current Properties Shape Microbial Community Diversity and Potential Functionality". United States. https://doi.org/10.1038/s41598-018-28939-0. https://www.osti.gov/servlets/purl/1491161.
@article{osti_1491161,
title = {Agulhas Current Properties Shape Microbial Community Diversity and Potential Functionality},
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.},
abstractNote = {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.},
doi = {10.1038/s41598-018-28939-0},
journal = {Scientific Reports},
number = 1,
volume = 8,
place = {United States},
year = {2018},
month = {7}
}
Web of Science
Figures / Tables:

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