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. 2017 Jun 13;7:3340. doi: 10.1038/s41598-017-03383-8

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© The Author(s) 2017

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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Hypotheses of the relationship between fish sound production levels and density. (H₁) A strong, predictive linear relationship with increases in sound levels as a function of density, (H₂) a weaker non-linear relationship where sound levels fail to respond to high densities, and (H₀) a non-predictive relationship with changes in density not affecting sound levels.