Extended Data Table 3 Loadings for rotated principal components of predictors of regional naturalization success measured for biogeographic syndromes (‘BGReg’ for biogeographic syndrome by region analysis)

	PC1_BGReg	PC2_BGReg	PC3_BGReg	PC4_BGReg
γ-Diversity	0.17	0.33	0.91	−0.12
Max α-Diversity	0.76	0.32	0.46	0.1
Mean α-Diversity	0.97	0.04	0.01	0.13
Log(γ- Phy. Diversity)	0.24	0.32	0.88	−0.14
Max α-Phy. Diversity	0.88	0.13	0.42	0.07
Mean α- Phy. Diversity	0.97	0.02	−0.05	0.07
log(Geographic area)	−0.29	0.28	0.88	−0.15
Temperature variability	−0.78	0.23	0.3	0.36
log(Precipitation variability)	−0.35	−0.1	0.34	−0.78
Glaciation	−0.64	0.2	0.12	0.65
log(Population Prehistoric)	0.03	0.5	0.74	0.13
log(Population Ancient)	−0.01	0.9	0.39	0.04
log(Population Post-Classical)	0.1	0.93	0.32	0.07
log(Population Early Modern)	−0.02	0.97	0.15	0.01
log(Population Late Modern)	0.03	0.94	0.31	0.09
% Economic Species	0.09	0.5	0.54	−0.48
Cumulative variance	0.29	0.56	0.83	0.93

Climate suitability and territorial links are not included because they were measured for every biogeographic syndrome by region pair. Loadings with an absolute value greater than 0.50 are in bold; less than 0.10 are in grey.

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