Table 1 Ranking of covariates determined by forward selection for the multivariate general additive model (GAM).

From: A hierarchy of environmental covariates control the global biogeography of soil bacterial richness

Step

Selected

ΔAIC a

p-valueb

1

Climatic water content

−104.64

<0.0005

2

Soil pH

−19.43

<0.0005

3

Mean annual temperature

−16.82

<0.0005

4

Silt fraction

−7.18

0.0083

5

Consecutive dry days

−1.59

0.0385

6

Cation exchange capacity

−0.08

0.1497

  1. aChange of Akaike information criterion (ΔAIC) when the variable was added to a model that already contained the covariates listed above the current step.
  2. bLikelihood ratio test of nested models.
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