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Table 1 Results of the randomization tests for the independent contributions of separate predictor variables in hierarchical partitioning to explain variation in the richness, abundance and phylogenetic diversity of tree communities in central Western Ghats, India (Results are expressed as Z-scores. *p < 0.05)

From: Functional trait and community phylogenetic analyses reveal environmental filtering as the major determinant of assembly of tropical forest tree communities in the Western Ghats biodiversity hotspot in India

Variable

NRI

NTI

Abundance evergreen

Abundance deciduous

Richness evergreen

Richness deciduous

Obs. I (%)

Z-score

Obs. I (%)

Z-score

Obs. I (%)

Z-score

Obs. I (%)

Z-score

Obs. I (%)

Z-score

Obs. I (%)

Z-score

Bio2

6.752

3.55*

5.767

−0.12

6.317

11.2*

6.161

9.41*

5.461

8.37*

4.623

6.99*

Bio3

8.828

4.66*

6.728

0

4.947

7.48*

4.911

7.00*

5.187

7.38*

4.317

6.09*

Bio4

9.451

5.33*

7.118

0.05

7.025

10.72*

6.945

10.87*

6.823

10.84*

5.251

7.5*

Bio5

4.270

1.67*

5.416

−0.27

7.527

12.03*

7.581

12.55*

6.631

9.13*

8.268

13.71*

Bio7

8.228

4.48*

6.002

−0.15

6.378

10.77*

6.251

9.12*

5.937

9.24*

4.893

6.6*

Bio12

11.364

6.62*

9.750

0.45

11.070

18.81*

11.132

16.63*

11.616

18.69*

11.392

18.76*

Bio13

11.354

6.32*

11.460

0.74

11.412

19.63*

11.576

17.14*

12.134

19.98*

11.109

18.58*

Bio15

8.050

4.22*

15.661

1.61*

5.209

7.91*

5.321

7.67*

6.224

9.05*

4.617

6.6*

Bio16

11.365

6.19*

9.484

0.45

11.304

18.71*

11.379

18.11*

11.961

18.18*

11.037

16.57*

Bio19

7.075

3.31*

9.336

0.34

10.662

17.58*

10.667

13.15*

11.933

17.43*

16.570

21.91*

PET

4.658

1.71*

5.562

−0.18

7.861

11.98*

7.778

10.23*

6.422

9.21*

7.115

9.17*

GAI

8.607

3.97*

7.718

0.18

10.288

15.2*

10.298

13.35*

9.672

12.71*

10.807

13.88

  1. Z-scores are calculated as (observed – mean (randomizations))/SD (randomizations), and statistical significance (*) is based on upper 0.95 confidence limit (Z ≥ 1.65). The variables which contributed the most and retained for further multiple linear regression (MLR) analysis using generalized linear models (GLMs) is given in bold. NRI Net relatedness index; NTI Nearest taxon index; Refer Additional file 1: Table S1 for details of predictor variables abbreviation