Table 2.
Results of one-tailed t-tests ascertaining whether mean NRI and NTI values of assemblages in different habitats (defined by substrate and vegetation physiognomy) differed significantly from zero.
| Habitat | Count | mean | SD | SE | df | t stat | p-value | ||
|---|---|---|---|---|---|---|---|---|---|
| Forest on canga (FC) | NRI | 5 | 0.92 | 2.06 | 0.92 | 4 | 0.99696 | 0.18760 | NS |
| NTI | 5 | 0.83697 | 1.35 | 0.60 | 4 | 1.39046 | 0.11838 | NS | |
| Forest on quartzite (FQ) | NRI | 9 | 1.37 | 1.67 | 0.56 | 8 | 2.45424 | 0.01984 | ∗ |
| NTI | 9 | 0.35 | 1.16 | 0.39 | 8 | 0.89474 | 0.19852 | NS | |
| Open vegetation on canga (OC) | NRI | 11 | 1.49 | 1.73 | 0.52 | 10 | 2.86135 | 0.00846 | ∗∗ |
| NTI | 11 | 1.68 | 1.22 | 0.37 | 10 | 4.54967 | 0.00053 | ∗∗∗ | |
| Open vegetation on quartzite (OQ) | NRI | 22 | 3.28 | 2.85 | 0.61 | 21 | 5.41118 | 0.00001 | ∗∗∗ |
| NTI | 22 | 1.87 | 1.94 | 0.41 | 21 | 4.51751 | 0.00009 | ∗∗∗ |
∗p < 0.05, ∗∗p < 0.01, ∗∗∗p < 0.001.