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. 2017 Jun 15;134(1):125–145. doi: 10.1007/s10533-017-0351-8

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© The Author(s) 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 7 — Seasonal patterns in the proportion of total measured N uptake accounted for by NO₃ ⁻, urea, NH₄ ⁺, and DFAA in a the <200 μm size fraction and b the <10 μm size fraction in Loch Creran in 2012. a NO₃ ⁻ (8–68%), urea (14–42%), NH₄ ⁺ (0–73%), DFAA (1–42%). b NO₃ ⁻ (1–56%), urea (4–59%), NH₄ ⁺ (21–55%), DFAA (0–38%)