Table 2 Overview of the estimates of the two-part hurdle models for the 10 native regions

From: Many plants naturalized as aliens abroad have also become more common within their native regions

 

Austria

Czech Republic

Denmark (southeast)

Flanders (Belgium)

Germany

Great Britain

Ireland

Netherlands

Switzerland

Thiérache (northern France)

Bernoulli part

          

Early occupancy (EO)

0.76***

1.16***

0.86***

1.59***

1.35***

1.28***

1.02***

1.12***

0.75***

1.17***

Occupancy change (OC)

0.15**

0.21**

0.67***

0.60**

0.16*

0.11

0.04

0.72***

0.27***

0.23

EO × OC

−0.09

0.40***

−0.007

0.17

0.14

0.06

−0.08

0.40*

0.45***

0.22

Zero-truncated count part

          

Early occupancy (EO)

0.36***

0.57***

0.49***

0.53***

0.66***

0.53***

0.53***

0.53***

0.38***

0.35***

Occupancy change (OC)

0.15***

0.09*

0.27***

0.26***

0.17***

0.23***

0.18*

0.45***

0.24***

0.02

EO × OC

−0.05

0.08

0.04

−0.03

−0.06

0.01

−0.003

0.21**

0.27***

0.02

  1. The Bernoulli part considers whether a species has become naturalized, and the zero-truncated count part considers the number of regions where a naturalized species has become naturalized. These models relate the two components of global naturalization success (naturalization incidence and extent) to occupancy in the early period (EO), the occupancy-change index (OC) and their interaction. To increase comparability, early occupancy was scaled to mean of zero and standard deviation of one. ***: P < 0.001, **: P < 0.01, *: P < 0.05. All p-values are two-sided, and no adjustments for multiple comparisons were applied. The detailed results of the hurdle models with the exact p-values for each region are provided in Tables S12–S21. Source data are provided as a Source Data file.
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