Agulhas Current properties shape microbial community diversity and potential functionality

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dc.contributor.author Phoma, Sandra
dc.contributor.author Vikram, Surendra
dc.contributor.author Jansson, Janet K.
dc.contributor.author Ansorge, Isabelle J.
dc.contributor.author Cowan, Don A.
dc.contributor.author Van de Peer, Yves
dc.contributor.author Makhalanyane, Thulani P.
dc.date.accessioned 2019-03-15T10:35:24Z
dc.date.available 2019-03-15T10:35:24Z
dc.date.issued 2018-07-12
dc.description.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. Betadiversity 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. en_ZA
dc.description.department Biochemistry en_ZA
dc.description.department Genetics en_ZA
dc.description.department Microbiology and Plant Pathology en_ZA
dc.description.librarian am2019 en_ZA
dc.description.sponsorship National Research Foundation (SANAP funding for TPM and IJA, Partial support was also provided under the Laboratory Directed Research and Development Program at PNNL, a multi-program national laboratory operated by Battelle for the U.S. Department of Energy under contract DEAC05- 76RL01830. We also gratefully acknowledge the University of Pretoria (Dean’s Funding for TPM, RDP funding for TPM). SP and SV were supported by the Innovation Scholarships (NRF) and the Claude Leon Foundation, respectively. en_ZA
dc.description.uri http://www.nature.com/srep en_ZA
dc.identifier.citation Phoma, S., Vikram, S., Jansson, J.K. et al. 2018, 'Agulhas current properties shape microbial community diversity and potential functionality', Scientific Reports, vol. 8, art. 10542, pp. 1-12. en_ZA
dc.identifier.issn 2045-2322 (online)
dc.identifier.other 10.1038/s41598-018-28939-0
dc.identifier.uri http://hdl.handle.net/2263/68688
dc.language.iso en en_ZA
dc.publisher Nature Publising Group en_ZA
dc.rights © The Author(s) 2018. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License. en_ZA
dc.subject South Indian Ocean en_ZA
dc.subject Marine microbial ecosystems en_ZA
dc.subject OMZ communities en_ZA
dc.subject Gammaproteobacteria en_ZA
dc.subject Functional capacity en_ZA
dc.subject Microbial diversity en_ZA
dc.subject Community structure en_ZA
dc.subject Agulhas Current system en_ZA
dc.subject South Indian Ocean (SIO) en_ZA
dc.subject Subtropical front en_ZA
dc.title Agulhas Current properties shape microbial community diversity and potential functionality en_ZA
dc.type Article en_ZA


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