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Abstract

Syndiniales (Dinophyceae, Alveolata) are a diverse parasitic group common in all marine environments, but their ecological role remains poorly understood. Here we show an unprecedented dominance of a single Syndiniales group I operational taxonomic unit (OTU) across 3000 km of Southern Ocean transects near the sea-ice edge. This super-abundant OTU consistently represented >20%, and in some locations >50%, of eukaryote 18S rDNA sequences. Identical 18S V4 sequences have been isolated from seven Northern Hemisphere locations, and the OTU’s putative V9 rDNA sequence was detected at every station of the global Tara Oceans voyage. Although Syndiniales taxa display some host specificity, our identification of candidate Southern Ocean hosts suggests this OTU associates with distinct phyla in different parts of the world. Our results indicate Syndiniales are key players in surface waters near the vast and dynamic sea-ice edge in the world’s most biologically productive ocean.

Item Type:	Article
Authors/Creators:	Clarke, LJ and Bestley, S and Bissett, A and Deagle, BE
Keywords:	protists, plankton, community composition, sea ice, spatial analysis, generalised dissimilarity modelling, metabarcoding
Journal or Publication Title:	ISME Journal
Publisher:	Nature Publishing Group
ISSN:	1751-7362
DOI / ID Number:	https://doi.org/10.1038/s41396-018-0306-7
Copyright Information:	Copyright 2018 International Society for Microbial Ecology
Related URLs:	Google Scholar: Clarke, LJ UTAS Profile: Clarke, LJ Google Scholar: Bestley, S UTAS Profile: Bestley, S
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