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. 2017 Jan 31;8:65. doi: 10.3389/fmicb.2017.00065

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Copyright © 2017 Sperling, Piontek, Engel, Wiltshire, Niggemann, Gerdts and Wichels.

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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Concentrations of combined carbohydrates >1 kDa (TCCHO) during the spring bloom. (A) Concentrations of TCCHO and combined glucose (Glc) and share of TCCHO in TOC (% TCCHO-TOC, TOC = POC + DOC) (B) Concentrations of neutral sugars including mannose/xylose (Man/Xyl), fucose (Fuc), galactose (Gal), rhamnose (Rha), and arabinose (Ara) (C) Concentrations of acidic sugars including gluconic acid (GlcA), glucuronic acid (GlcUA), galacturonic acid (GalUA), and muramic acid (Mur) (D) Amino sugars including glucosamine (GlcN) and galactosamine (GalN). The green shaded area represents concentrations of chlorophyll a.