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. 2019 Oct 23;9:15207. doi: 10.1038/s41598-019-50508-2

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© The Author(s) 2019

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 MP and sediment distribution patterns. (A–C) Correlation analysis of specific MP and sediment grain size fractions in relative abundances. The inclusion of the outliers (shown as grey triangles) S10 and S1, would unduly influence the regression fit (decrease of r² to 0.31 and 0.07, respectively) and were consequently excluded from the analysis. (D) Correlation of TMP (log transformed, black squares) and HD polymers (grey diamonds with dashed line) as absolute values with median grain size (d50). (D, insert) Residual analysis of TMP values normalised by the median grain size (d50). Individual studentised residuals are shown as pluses non of which is deemed a clear outlier. (E) Fine sediment fraction (<63 μm) against TMP abundance (log transformed, black squares). Y-axis label is shared with (D). Graphs in different shades of grey present an assemblage of available study sites^9,14,16 showing comparable relationships. Small black diamonds with the dashed line represent LD polymers and fibres. For later reference, in both (D) and (E), the respective position of the Baltic Sea sample, Arkona Basin (AB, d50 = 17.3 ± 1.7 μm, <63 μm = 99.6 ± 0.4%, n = 4 ³⁶), is marked as a cross. The Gotland Basin with comparable sediment grain size features (GB, <63 μm = 95.7 ± 3.5%, n = 3 ⁶⁵) does not display in the log rendering as MP numbers equal zero. The used grain size data for the two Baltic Sea sediment samples showed neglectable variation across our sampling region^36,65. Significant correlations are marked with asterisks. All data displayed on a log scale are based on log transformed regression coefficients.