Table 1.
Community metrics for the 4 land uses: 6 indices of bacterial diversity and 7 indices of bacterial network. Different letters indicate a significant statistical difference between land uses, based on a parametric variance analysis followed by a Tukey HSD post-hoc comparison (n = 100 for each land use).
| Community metrics | Forest | Grassland | Crop system | Vineyards | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean | sd | Diff. | Mean | sd | Diff. | Mean | sd | Diff. | Mean | sd | Differences | ||
| Diversity | Richness in OTUs | 1,083.3 | 224.0 | c | 1,238.1 | 157.1 | b | 1,305.9 | 167.9 | a | 1,342.8 | 152.3 | a |
| Shannon’s index for OTUs | 5.27 | 0.39 | c | 5.41 | 0.32 | b | 5.50 | 0.31 | a | 5.57 | 0.23 | a | |
| Eveness for OTUs | 0.18 | 0.04 | ns | 0.18 | 0.04 | ns | 0.19 | 0.04 | ns | 0.19 | 0.03 | ns | |
| Richness in genera | 284.6 | 54.1 | c | 333.4 | 32.0 | b | 360.2 | 28.4 | a | 359.5 | 24.6 | a | |
| Shannon’s index for genera | 4.04 | 0.31 | c | 4.19 | 0.21 | b | 4.25 | 0.2 | a | 4.26 | 0.12 | ab | |
| Eveness for genera | 0.21 | 0.03 | ns | 0.2 | 0.03 | ns | 0.2 | 0.03 | ns | 0.2 | 0.02 | ns | |
| Co-occurrence network | Number of links | 16,430.8 | 3,109.3 | a | 5,846.4 | 2,208.0 | b | 4,122.6 | 1,138.8 | c | 2,046.7 | 281.3 | d |
| Number of positive links | 12,042.4 | 2174.9 | a | 4,539.5 | 1,917.4 | b | 3,101.2 | 697.3 | c | 1,794.0 | 172.2 | d | |
| Number of negative links | 4,388.4 | 1,123.6 | a | 1,306.8 | 486.5 | b | 1,021.4 | 475.8 | c | 342.7 | 115.3 | d | |
| Positive:Negative links | 2.9 | 0.7 | c | 3.7 | 1.8 | b | 3.5 | 1.2 | b | 5.5 | 1.7 | a | |
| Connectance | 0.008 | 0.002 | a | 0.003 | 0.001 | b | 0.002 | 0.0005 | c | 0.001 | 0.0001 | d | |
| Average path length | 0.139 | 0.007 | a | 0.129 | 0.019 | b | 0.116 | 0.016 | c | 0.080 | 0.009 | d | |
| Average degree | 16.2 | 3.1 | a | 5.8 | 2.2 | b | 4.1 | 1.1 | c | 1.0 | 0.3 | d | |
Letters indicate differences of values between land uses. They are provided by Tukey-HSD pairwise comparison.