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. 2020 Nov 11;3:660. doi: 10.1038/s42003-020-01392-4

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Principal component analysis (PCA) of physicochemical characteristics for all substrates (6 intact litter and 36 faeces treatments, Fig. 1). a displays the variable loadings (dark-grey arrows) and the correlations of intact litter and faeces C and N losses with the PCA axes (yellow and brown arrows for intact litter and faeces, respectively). b displays the scores for all substrates (mean; n = 3), with coloured convex hulls containing, for each litter species, faeces types derived from all detritivore species; intact litter is displayed separately. WHC water-holding capacity, DOC dissolved organic carbon, TDN total dissolved nitrogen. Variables were centred and standardised prior to ordination.