Table 1 Predictors of establishment richness of traded alien vertebrates across countries with upper middle income or high income

Taxa	Mammals		Birds		Reptiles		Amphibians
Predictors	Estimate	Pr(>\|z \| )	Estimate	Pr(>\|z \| )	Estimate	Pr(>\|z \| )	Estimate	Pr(>\|z \| )
Intercept	0.174	0.707	−2.763	0.000	−0.276	0.647	−0.822	0.460
Area	0.006	0.911	0.248	0.000	0.112	0.229	0.171	0.007
Population density	0.063	0.227	0.305	0.000	0.129	0.190	0.215	0.015
GDPpc	0.104	0.169	0.432	0.000	0.161	0.195	0.221	0.022
Colonization pressure	0.358	0.000	0.210	0.012	0.330	0.000	0.219	0.001
Insularity	0.234	0.032	0.285	0.000	0.236	0.002	0.194	0.012
Mean temperature	−0.028	0.000	0.005	0.153	0.014	0.009	0.000	0.999
Mean precipitation	0.090	0.275	−0.088	0.174	0.167	0.125	0.141	0.119
Congeneric richness	0.276	0.071	−0.098	0.379	−0.051	0.243	0.104	0.184
Sampling effort	0.545	0.004	0.124	0.434	0.364	0.078	0.226	0.213

The table summarizes the standard estimates and probabilities of regression coefficients based on conditional averaging (2⁹ = 512 models) for linear mixed models with the relationship between the number of established traded alien species in a country as the response variable and combinations of 9 factors as predictors (fixed effects) across 100 countries (n = 100). Biogeographical realm was included as a random effect. Significant results are marked in bold type.

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