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. 2020 Jan 29;10:1424. doi: 10.1038/s41598-020-57426-8

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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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The intensity of biological and environmental variables in the SOM regions (subclusters of output neurons; see Fig. 2). (a) The associations (p ≤ 0.05) of 12 indicator vespid species with the SOM regions (greyness based on virtual samples of vespid wasps). There were no such species for subcluster X_L. The maximum indicator value (IndVal; based on real samples of vespid wasps) recorded for a given species and the respective significance level (p ≤ 0.05; **p ≤ 0.01; ***p ≤ 0.001; ****p ≤ 0.0001)) are presented on the left side of each species plane outside parentheses. Species with similar patterns over the SOM occurred in similar environmental conditions. (b) Selected environmental variables. × – empty neuron (i.e. without any assigned sample; see Fig. 2) or values not determined. The remaining explanations as in Fig. 4. (c) The scale. Shading (based on virtual samples in (a) and initial data in (b)) was scaled independently for each variable. The real values varied from zero to the maximum value presented on the left side of each plane in parentheses.