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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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Spatial distribution of mean square pressure amplitude (p ²; Pa²; 251 Hz–498 Hz). Sound levels over the frequency band of Gulf Corvina (Cynoscion othonopterus) chorusing in the spawning grounds of the northeastern channel of the Colorado River Delta on the incoming and outgoing tides on (a,b) 27 March 2014, (c,d) 28 March 2014, (e,f) 27 April 2014, and (g,h) 28 April 2014. Collection of passive acoustic data on the outgoing tide of 27 March 2014 (b) continued after the conclusion of the active acoustic survey. Maps were generated using the ArcMap extension of ArcGIS version 10.2.2 (http://www.esri.com/, ESRI, USA).