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. 2016 Apr 26;7:590. doi: 10.3389/fmicb.2016.00590

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Copyright © 2016 Milici, Tomasch, Wos-Oxley, Decelle, Jáuregui, Wang, Deng, Plumeier, Giebel, Badewien, Wurst, Pieper, Simon and Wagner-Döbler.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Beta diversity patterns are shaped by environmental parameters and phytoplankton communities. Principal coordinate analysis was used to show similarities among samples: (A) (FL), (B) (SPA), and (C) (LPA). In order to assess the effect of environmental parameters on the structure of the plot, Pearson correlation was calculated with the principal coordinates, after Bray-Curtis similarity was calculated on standardized abundance data at the OTU level. Only correlation higher than 0.4, with the first two axes were displayed on the chart area. The total amount of samples was reduced to match the biological data (bacterial abundances) with the environmental data (temperature, salinity, depth, and chlorophyll a) and with the relative abundance of phytoplankton (SP and LP). Color codes discriminate oceanographic provinces, while depth layers are shown with different symbols.