Table 2. Chao estimates of sample completeness for hydrothermal vent ecosystems in eight biogeographic provinces.
| Biogeographic Province | T | Q1 | Q2 | t | Fobs | g | 1.0 | 0.99 | 0.9 | 0.8 |
|---|---|---|---|---|---|---|---|---|---|---|
| Indian Ocean | 76 | 16 | 7 | 7 | 33 | 0.68 | 43 | 26 | 9 | 4 |
| Mid-Atlantic Ridge | 223 | 20 | 12 | 28 | 53 | 0.77 | 127 | 73 | 20 | 4 |
| Mid-Cayman Spreading Center | 32 | 6 | 6 | 5 | 15 | 0.86 | 11 | 7 | 1 | – |
| Northeast Pacific (Juan de Fuca Ridge) | 56 | 8 | 1 | 14 | 16 | 0.35 | 315 | 220 | 99 | 62 |
| Northern East-Pacific Rise | 102 | 12 | 5 | 8 | 36 | 0.74 | 49 | 29 | 9 | 3 |
| Southern Ocean | 28 | 20 | 2 | 5 | 23 | 0.22 | 150 | 90 | 43 | 28 |
| Northwest Pacific | 461 | 60 | 10 | 40 | 105 | 0.37 | 943 | 487 | 216 | 134 |
| Southwest Pacific | 117 | 36 | 7 | 16 | 54 | 0.38 | 286 | 162 | 71 | 44 |
Note:
T is the total number of presence records, Q1 is the number of observed singletons, Q2 is the number of observed doubletons, t is the total number of samples, Fobs is the observed number of families, g is the proportion of completeness. 1.0, 0.99, 0.9, and 0.8 are the relative completeness proportions from which the number of additional samples needed was inferred (as these values represent potential research cruises, they are rounded up to the nearest whole number).