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. 2021 Dec 20;12:804527. doi: 10.3389/fpls.2021.804527

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Copyright © 2021 Chen, Hu, Zheng, Yang, Fan, Deng, Yao, Wang, Peng and Li.

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) and the copyright owner(s) 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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Each node was identification to classify the keystone taxa in molecular ecological networks of bacterial communities. Each symbol represents an OTU from the network of CK, Y10, Y20 and Y40. The value of Zi and Pi confirmed each OTU's topological role. Nodes were identified into four models depended on their Zi and Pi values: module hubs (Zi > 2.5 and Pi < 0.62), network hubs (Zi > 2.5 and Pi > 0.62), connectors (Zi < 2.5 and Pi > 0.62) and peripherals (Zi < 2.5 and Pi < 0.62). Besides, the number of module hubs and connectors as well as the OTUs that repeatedly appear in different networks were shown in the corresponding area of the plot.