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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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Examples of the different vertical distribution types of the faunal groups we encountered with PELAGIOS. The abbreviations refer to: upper layer (UL), upper oxycline (UOC), oxygen minimum zone (OMZ), lower oxycline (LOC), as well as sample size for night sampling (Nn) and day sampling (Dn). (a) Lilyopsis (Nn = 20; Dn = 27) with a restricted distribution that corresponds with the OMZ (Type 1), (b) Beroe (Nn = 58; Dn = 82) with a distribution that is disrupted by the OMZ (Type 2), (c) Atolla (Nn = 23; Dn = 25) with a distribution below the OMZ, including vertical migration (Type 3), (d) Bathochordaeus (Nn = 34; Dn = 4) with a distribution above the OMZ (Type 4), (e) Solmissus (Nn = 74; Dn = 88) with a wide distribution pattern that peaks in the OMZ (Type 1) and (f) the distribution of fishes (Nn = 1803; Dn = 1862) which shows diel vertical migration, but peaks also in the OMZ.