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. 2020 Jun 26;10:10499. doi: 10.1038/s41598-020-67534-0

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© The Author(s) 2020

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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Historical population size of California sea lions (Zalophus californianus) in the Gulf of California. Annual medians (black dots) and 95%-credible intervals (CI; black error bars) of the numerical reconstruction are shown. Black inner ticks on the X axis mark the years for which any colony count was available. Medians of decadal changes and the 28-year decline in percentage are within gray and purple boxes, respectively. The population size prediction from the multi-decadal anomalies of sea surface temperature (SST) is shown as a green thick line (median) and green shaded area (95%-CI).