Fig. 5: Results of statistical analysis.
A, B Plots of non-metric multidimensional scaling results.The points are numbered according to coring sites. The closer the points plot to each other, the more similar they are. Ellipses indicate 95 % confidence intervals of the standard deviation. C, D Plots of sedimentary total C contents28 and Artichnus diameter in Southern, Central and Northern Japan Trench. Red vertical bars indicate interquartile ranges. Median value points are connected by a blue line. The numbers are p-values of two-sided Wilcoxon rank sum tests with Bonferroni correction for multiple comparisons. E Spearman rank correlation matrix of bioturbation properties, sediment grain size median and total C, N and S contents. F Plot of sediment total C content versus Artichnus diameter with Spearman rank correlation coefficients and a linear regression line. The shaded band indicates the 95% confidence interval. P-values < 0.05 are considered statistically significant. n – number of observations. Source data for Fig. 5 are available as a Source Data file.
