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. 2016 Jan 11;6:19054. doi: 10.1038/srep19054

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Copyright © 2016, Macmillan Publishers Limited

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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The OTU richness (ln S) at each sampling site and depth was plotted against the latitude for the upper (>100 m, left) and lower (>100 m, right) water depths. Generalized Additive Models were fitted with cubic spline. Color code indicates the size fraction of the marine plankton. The coefficient of determination (adjusted R²) and its significance (**p < 0.01) are reported for each model.