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. 2020 Dec 11;10:21798. doi: 10.1038/s41598-020-78255-9

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© The Author(s) 2020

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Principal component analysis of the daytime (A) and nighttime (B) community composition (46 taxa, see Table S2). Circles are samples, with the color indicating the four nominal depth layers. One sample is a discrete observation (one transect at a given station). Taxa are represented by numbers, color coded by the identified distribution type 1 (in OMZ, blue), 2 (bimodal, magenta), 3 (above OMZ, cyan), 4 (below OMZ, black) and 5 (no clear pattern, grey). Numbers in circles identify taxa with diel vertical migration (M). The mid-point of the taxon numbers is the PC1/PC2 score location. Vectors are only drawn for environmental variables (oxygen, temperature, chlorophyll-a, and particles). The layer abbreviations refer to: upper layer (UL), upper oxycline (UOC), oxygen minimum zone (OMZ), and lower oxycline (LOC).