Table 2 Life history predictors of US live wildlife trade probability and frequency in mammals from hurdle models

From: Human activities favour prolific life histories in both traded and introduced vertebrates

  

Posterior mean

l-95% CI

u-95% CI

% crossing 0

VIF

Binary

Gestation period

−0.74

−3.21

1.50

26.12

4.34

 

Weaning age

0.97

−0.43

2.61

10.02

2.82

 

Litter size

5.27

3.02

7.51

0.00

2.78

 

Litters per year

2.43

0.38

4.42

0.80

2.62

 

Reproductive lifespan

6.38

4.19

8.49

0.00

3.28

 

Body mass

0.72

0.14

1.37

0.84

3.29

Frequency

Gestation period

−0.76

−1.89

0.46

10.30

4.34

 

Weaning age

0.86

0.11

1.60

1.18

2.82

 

Litter size

2.37

1.18

3.48

0.00

2.78

 

Litters per year

1.02

0.01

2.07

2.64

2.62

 

Reproductive lifespan

2.28

1.00

3.46

0.02

3.28

 

Body mass

0.17

−0.15

0.47

12.30

3.29

  1. Full parameters for hurdle model predicting US live wildlife trade probability and frequency in mammals, after iteratively removing variables with the highest VIFs until none were >5 (neonatal body mass and age at first birth, N = 518, H2 for binary component = 0.50 [0.25, 0.71], H2 for Poisson component = 0.16 [0.00, 0.53]). Post. mean = mean β coefficient from posterior distributions, l-95% CI and u-95% CI = lower and upper 95% credible intervals from posterior distributions respectively, % crossing zero = percentage of estimates in the posterior distribution that overlap with zero in the direction opposite to the majority of the distribution, VIF variance inflation factors. For ease of interpretation, effects from the binary component of the model are reversed in sign (so that they represent effects on the probability that the outcome variable is 1 or more, rather than 0).
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