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. 2023 Jan 18;6:64. doi: 10.1038/s42003-023-04452-7

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© The Author(s) 2023

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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Fig. 4 — Relative abundance values and OTU counts for six taxonomic groups are shown across the five water masses sampled in this study, along with results of relevant dispersion analyses (panels a, b): either multiple ANOVA or the non-parametric Kruskal-Wallis test followed by post-hoc Dunn’s test, depending on a preceding test for normality (Suppl. Fig. 8). The statistical tests were applied to sample sets of the following sizes: 6 samples (Surface Water), 30 samples (Shelf Water), 20 samples (Modified Warm Deep Water), 24 samples (Warm Deep Water), 30 samples (Weddell Sea Deep Water). We also follow relative abundance or OTU richness of these six taxonomic groups along the depth (c, d) and oxygen concentration (e, f) gradients. The y-axis scales are logarithmic in panels (a) and (b), and the x-axis scales are logarithmic in panels (c), (d), (e), and (f). Similar results for all the 26 clades explored in this study are shown in Suppl. Figs. 5 and 6. Trend lines calculated using the GAM approach are shown, along with percentage of variance explained and individual data points. Depths and oxygen concentration values identified as ecological boundary points (Fig. 2) are marked with horizontal gray lines. The source data underlying this figure see in Suppl. Data 1.