Table 1.
NRI and NTI for globally distributed bacterial communities
| Sequence analysis | Cluster analysis | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| N | NRI | RGR | NTI | RGR | N | NRI | RGR | NTI | RGR | |
| Arctic Ocean | 286 | 0.92 | 813 | 3.41** | 999 | 143 | 0.35 | 620 | 4.54** | 999 |
| Baffin Bay | 253 | 29.03** | 999 | 7.33** | 999 | 62 | 6.52** | 999 | 5.34** | 999 |
| Cape Town | 211 | 1.09 | 863 | 2.73** | 996 | 135 | −0.11 | 457 | 3.64** | 999 |
| Conception, Chile | 677 | −2.34** | 8 | 6.02** | 999 | 248 | 2.18** | 987 | 5.19** | 999 |
| Fiji | 542 | 6.52** | 999 | 1.32 | 913 | 272 | 2.00* | 965 | 2.01** | 974 |
| Hawaii | 402 | 4.48** | 999 | 1.67* | 954 | 232 | 1.13 | 873 | 4.12** | 999 |
| San Diego | 438 | −4.70** | 0 | 5.42** | 999 | 142 | −4.01** | 0 | 3.43** | 998 |
| Sargasso Sea | 507 | 13.31** | 999 | 3.87** | 998 | 257 | 5.89** | 999 | 5.50** | 999 |
| Sidney | 301 | 2.62** | 991 | 0.86 | 803 | 197 | 0.17 | 575 | 3.49** | 999 |
NRI net relatedness index, NTI nearest taxa index, N number of taxa in community, RGR number of runs where the observed NRI/NTI values are greater than in the randomly drawn null community, left results from sequence-level analysis, right results from cluster-level analysis
Stars indicate statistically significant (* - P < 0.01; ** - P < 0.05) community structuring