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. 2021 Aug 20;11:16830. doi: 10.1038/s41598-021-94286-2

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Concentrations of eDNA were compared among the lower (the peak of the polycyclic aromatic hydrocarbons (PAHs) and below), middle (lower half of the layers above the peak of the PAHs), and upper parts of the core layers (the upper rest) collected at St. 3. Different letters indicate significant differences among parts (p < 0.05, Tukey’s HSD test).