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. 2019 Jul 31;10:1747. doi: 10.3389/fmicb.2019.01747

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Copyright © 2019 Ragab, Katuri, Ali and Saikaly.

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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Box plot of alpha diversity using observed OTUs, Chao1, Shannon–Weaver and Simpson diversity indices by (A) Reactor and (B) Position. “R1,” “R2,” and “R3” refer to Reactor 1, Reactor 2, and Reactor 3. Each box represents the middle 50% of the data, while the middle quartile marks the mid-point. The lower quartile presents the 25% of scores that fall below the inter-quartile, while the upper quartile represents the 25% above the inter-quartile. No significant difference, except in the Shannon plot by Reactor, in (A) (ANOVA, F = 7.34, p = 0.0244).