Figure 1.
Distribution of geo-referenced records for tree species in China.
Included are 461122 records of the 707 tree species occurring in the four marked plots (red dots). Units on the axes are 1000 kilometers.
Table 1.
Size, geographic location, number of species, and endemics to China for the four census plots, plus the geo-referenced record number for those species.
Figure 2.
Illustrations of Gaussian distributions estimated with the Bayesian likelihood approach.
Red points give locations of the plots in which each species was observed. Straight lines join each plot and the range centers. Ten probability contours evenly spaced from zero to are shown in gray.
Figure 3.
Relationship between estimated range size and sample size of geo-referenced records.
Panel A is for real species, and Panel B for random draws from the entire pool of geo-referenced records. In panel A, solid points indicate species from Gutianshan; open circles are for species endemic to China (any of the plots). The green solid line (lower) is a trend curve through the Gutianshan points, and the solid red (upper) line through the endemics. The dotted curve is the lower 95% confidence limit of random ranges (from Panel B). Panel B is a test for bias in estimated range size caused by sample size. The solid, central curve is the mean range size from 1000 draws at each value of N (sample number of geo-referenced records), and two dotted curves are 95% confidence intervals (the central 95 percentiles of 1000 draws). Samples were done at N = 3, 5, 10, 15, 20, 25, 30, 40, 50, 60, 70, 80, 90, 100, 150, 200, 400, 600, 800, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 5500, 6000, 6500, 7000.
Figure 4.
Histogram of species’ range sizes.
Panel A is for all species in the study, panel B for all endemics, and Panel C for all species from the Gutianshan plot. In each case, only species with ≥20 geo-referenced records were included.
Figure 5.
Relationship between range size and local abundance.
Panel A shows all species from the Gutianshan plot, and the other panels endemics from Gutianshan (B), Dinghushan (C), and Xishuangbanna (D). The axes were both log2-transformed. In each case, only species with ≥20 geo-referenced records were included.
Figure 6.
Correlation between differences in species’ abundances (ΔA) and differences in distances from their range centers.
Panel A uses relative distances from species’ range centers (ΔDrcp), and panel B absolute distances (ΔDcp).
Figure 7.
Correlation in local abundances of species between plots.
Panel A is for Gutianshan (GT) vs. Dinghushan (DH). Panel B is for Xishuangbanna (BN) vs. Dinghushan. The axes are both log2-transformed. Lines are linear regressions and statistics from the Pearson correlation coefficients.