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. 2022 May 3;13:836943. doi: 10.3389/fmicb.2022.836943

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Copyright © 2022 Noell, Baptista, Smith, McDonald, Lee, Stott, Amend and Cary.

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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Comparison of soil physicochemistry between Tramway Ridge (TR) and Western Crater (WC). (A,C) Boxplots for (A) each environmental parameter and (C) elements of interest that were significantly different between the two sites, showed significant trends with temperature, or are potential substrates for microbial metabolism. (B) Line plots showing the variation with temperature of environmental parameters and elements that were significantly correlated (Spearman’s correlation coefficient, p < 0.05) with temperature at one of the two sites; all significant correlations were found at WC. Elements were grouped by their patterns of difference between sites. * indicates significant difference between samples from the Western Crater transect and both Tramway Ridge transects (two-sided t-test, p < 0.05). Ppb: concentration in parts per billion. GWC: gravitational water content. TC: total carbon; TN: total nitrogen.