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. 2015 Aug 21;10(3):533–545. doi: 10.1038/ismej.2015.131

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Copyright © 2016 International Society for Microbial Ecology

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 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-nc-nd/4.0/

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Results from principal component analysis of mass to charge ratios (m/z) that derived from ESI-MS. The first and second principal component explained 30.9% and 17.1% of the variability, respectively. Samples from both the beginning (not numbered) and end (numbered) of the experiment are visualised. Numbers depict replicates one, two and three. Hulls were drawn to group not only the replicates within a treatment but also the samples at the beginning of the experiment. Abbreviations: Ba, Baltic; C, control; GW, groundwater; HL, headwater lake; VA, Vindelälven.