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D684 Transect 53 Gentle/moderate muddy slope with mainly sea urchins, starfish and ophiuroids. P1. Water depth: 2511-2487m. Feature: Canyon, escarpment
Highlights: Soft coral - Anthomastus and brittlestar Ophiomusa Close-up of brittlestar Ophiomusa Rusty barrel Birdbeak dogfish - Deania calcea
Of Note: Cup corals and soft coral Anthomastus, strong currents.
Primarily soft sediment. Fauna includes the cup coral Flabellum, the soft coral Anthomastus, starfish, echinoids, ophiuroids and occasional burrows. A discarded, corroded oil drum is observed. Dive aborted after 50 minutes with a suspected umbilical problem.
START VIDEO [00:00:00]/19:41. The entire dive is set on gentle/moderate muddy slope with mainly sea urchins, starfish and ophiuroids . [1] [00:01:00] ROV stops for sampling two pushcores. [00:13:00] Here ROV zooms in and shows some fluffy organic matter and pteropod hash on moderate muddy slope. [00:14:00] [2] Echinus sp. on mud dominates for the rest of the transect. [00:34:00] Rusted large barrel (< 1 m in length). END VIDEO [00:52:00]/20:26.
| Progression | Start | Duration | Code | Name |
|---|---|---|---|---|
| 1 | [00:00:00] | 00:13:48 | M.AtUA.Mu | Atlantic upper abyssal mud |
| 2 | [00:13:49] | 00:38:12 | M.AtUA.Mu.UrcCom | Urchin dominated community on Atlantic upper abyssal mud |
Cnidaria
Cerianthidae sp. 1 : 2 : R
Caryophyllia sp. 2 : 6 : F
Flabellum sp. : 1056 : R
Anthomastus grandiflorus : 278 : F
Distichoptilum gracile : 1108 : R
Arthropoda
Caridea (indet.) : 1077 : R
Bathynectes sp. : 235 : R
© Marine Institute, MERC Consultants, Bernard Picton 2022