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. 2018 Oct 30;8:16028. doi: 10.1038/s41598-018-34470-z

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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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Background resemblance of prawn morphs against seaweeds. Principal Component Analysis applied to seahorse Hippocampus subelongatus cone catches showing colour variation of Hippolyte obliquimanus colour morphs (‘pink’ and ‘brown’ to the human vision) and seaweed habitats (red Galaxaura marginata and brown Sargassum furcatum). Percentage values correspond to the total variation explained by each component. The upper-right indent panel indicates that the shortwave colour channel (sws) is the main responsible for the segregation of groups. Brown crosses indicate the few (n = 5) cases in which prawn colour resemblance was closer to the alternative rather than to the host habitat colour (all ‘brown’ individuals which were actually closer to G. marginata). Sws, mws and lws stand for short, medium and long-wave sensitivity channels.