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. 2018 Aug 27;8:12823. doi: 10.1038/s41598-018-31262-3

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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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Relationships between the number of symbiont cells per polyp and the photosynthetic performance of the different octocoral species, normalized by symbiont density (sea fan- dark grey circle, sea plumes- black circles, sea whips- grey circles, sea rods- white circles). Exponential relationship between symbiont density and (a) maximum photosynthetic rate (R² = 0.82, y = 1.32 + 1.99^(−133.2x), p = 0.0061) and (b) photosynthetic efficiency (R² = 0.92, y = 0.0021 + 0.0046^(−230.5x), p = 0.0008). Data represent means ± SE (n = 6).