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. 2017 Oct 24;12(1):237–252. doi: 10.1038/ismej.2017.165

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Copyright © 2018 The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Season and phytoplankton substrate-driven oligotype switching is observed between oligotypes with >97% identity. Relative abundance bar plots show examples of switches in oligotype dominance. Julian days are represented on the x axis and total oligotype relative abundance is represented as a fraction on the y axis. Spring and summer are denoted by the dark and light gray areas, respectively. Flavobacteriia genera Polaribacter (a) and Formosa (b) exhibit potential phytoplankton substrate-driven changes in dominance over short time intervals between oligotypes with 99.5% identity. Genera Owenweeksia, (c, Flavobacteriia) and Pseudospirillum (d, Gammaproteobacteria) exhibit sinusoidal seasonal changes in dominance between oligotypes with >97% identity, visible when relative abundance is scaled to 1 (stacked bars). The total cumulative relative abundance of displayed oligotypes in c and d is represented by the black line (y axis).