Fig. 3: Floristic similarity trends over time and grouped by human occupancy for all sites.
From: Floristic homogenization of South Pacific islands commenced with human arrival
a, Non-parametric regressions were fitted using smoothing splines deploying package npreg92 with function ss (fit a smoothing spline). Smoothing splines showing pairwise Bray–Curtis similarity scores among all 15 sites on 13 islands, over the past 5,000 cal years BP. 1, greatest similarity; 0, lowest similarity. The dark blue line represents the standardization-1 dataset, and the lighter blue line represents the standardization-2 dataset. The grey shaded areas represent 95% confidence intervals. Open circles represent standardization-1 datapoints, and open triangles represent standardization-2 datapoints. b, Pairwise Bray–Curtis comparisons for the standardization-1 dataset grouped according to whether neither (n = 223), one (n = 430) or both (n = 157) islands were settled during a time interval. n, number of individual pairwise comparisons. The black horizonal lines represent the medians, and the box areas represent the first and third quantiles. The whiskers of the boxplot extend to the last data points within 1.5 times the range from first quantile to third quantile (interquartile range of the box).
