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. 2018 Nov 9;9:4713. doi: 10.1038/s41467-018-07217-7

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© The Author(s) 2018

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. 2 — Patterns of latitudinal variation in species richness, spatial gaps and sampling efficiency for marine taxa. Circles represent mean values based on results of 10 taxonomic groups. Shaded area and vertical bars represent standard deviation (s.d.). Data were standardised by the maximum observed value to range between 0 and 1. a Mean (± s.d.) latitudinal variation in number of observed species (dark grey circles) and number of missing species (light grey circles). Notice that the number of missing species exceeds the number of recorded species at lower latitudes. b Mean (± s.d.) latitudinal variation in sampling effort (number of unique sampling events; open circles) and two estimates of inventory completeness (sample coverage: orange circles; species accumulation curve: dark blue circles)