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. 2018 Jan 19;9:3. doi: 10.3389/fmicb.2018.00003

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Copyright © 2018 La Cono, Ruggeri, Azzaro, Crisafi, Decembrini, Denaro, La Spada, Maimone, Monticelli, Smedile, Giuliano and Yakimov.

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) or licensor 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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Neighbor-joining phylogenetic nucleotide tree of thaumarchaeotal amoA obtained from the three stably nitrifying enrichments ATA, KRY, and SAL5. The marine clades 1–2 of high ammonia concentration ammonium-oxidizing archaea (HAC-AOT) and the marine clades 3–6 of low ammonia concentration ammonium-oxidizing archaea (LAC-AOT), as defined by Sintes et al. (2016), are color-coded as aquamarine and yellow, respectively. Sequences of enrichments are also color-coded according to types of clone library origins, as blue (ATA), green (KRY), and red (SAL5). Significant bootstrap values are shown as open (>50) and red-filled (>70) circles at branch nodes.