Table 2.
Description of sites10,11,13,17,33,40. Levels of hydrothermal activity are given here as relative terms.
| Site | Depth (m) | Hydrothermally active? | Approximate Temp. (°C) | Chemosynthetic macrofauna? | Chemosynthetic substrates |
|---|---|---|---|---|---|
| Off-Vent (BOV) | 1150 | No | −1 | Siboglinum sp. | CH4 [up to 7 μmol l−1] |
| Hook Ridge 1 (HR1) | 1174 | Yes, low activity 9 cm yr−1 fluid advection10 | 24 | Sclerolinum contortum | H2S [up to 6 μmol l−1], CH4 [up to 10 μmol l−1] |
| Hook Ridge 2 (HR2) | 1054 | Yes, high activity 34 cm yr−1 fluid advection | 48 | No | H2S [up to 160 μmol l−1], CH4 [up to 26 μmol l−1] |