Marine Institute
SeaRover Dive Video

D540 Transect RB17 Epifaunally diverse with abundant Antipathes and sponges. Dense colony of Lophelia/Madrepora reefs. Not Priority. Features: Escarpment, Mound. Water depth: -840 m. TL: 3 km SOL: 15° 9.296' W 55° 40.713' N

Highlights: Demosponge - Oceanapia sp. Bamboo coral Hexactinellid sponge - Euplectella

The site is characterised by coral rubble and reef throughout although live coral is rarely above 25%. A steep incline extends from 870 m to 750 m and associated fauna include Bathypathes sp., Acanella sp., Stichopathes sp., stalked crinoids, cup corals, sponges, the Venus flower basket Euplectella aspergillum and a small gorgonian. Leiopathes sp.is frequent throughout. The squat lobster Munida sp. and ophiuroids are common among the rubble as are grenadiers and codfish.

START VIDEO [00:00:00]/18:34 [1] The transect starts on an epifaunally diverse moderate pebble /gravel/coral gravel /cobbles/ boulders slope. Abundant/dominant Leiopathes sp. OTU305 and Phakellia ventilabrum OTU202 on cobbles. Bed of Ophiuroidea sp. (indet) OTU1076. [00:08:00] [2] Sediment changes now predominantly into coral rubble and coral gravel, with sparse/rare boulders. [18:46:00] ROV stops for imagery and sampling of a sponge. Bed of ophiuroids continues until [00:38:00] [3] Now substrate changes into coral framework (mostrly dead) with frequent sights of crinoids Koehlermetra porrecta OTU315 and Acanella arbuscula (firtree) OTU991. [19:08:00] [00:40:00] ROV stops for imagery and sampling of A. arbuscula (firtree). [00:42:00] ROV stops for imagery. [00:44:00] [4] ROV swims on the edge of continental slope covered in dense Lophelia pertusa/Madrepora oculata reef on soft bottom. Here the geomorphology features (predominantly ridges) intersperse erratically, from steep up ridge to moderate down ridge. The ROV surveys the transect along and across the ridges. [00:45:00] Leiopathes sp., A. arbuscula (firtree) and Cidaris cidaris OTU211 are frequent in this part of the transect. [19:38:00] Here dense L. pertusa/M. oculata reefs (dead and living) with mixed coral and K. porrecta living on them. [01:13:00]-[01:16:00] ROV stops for sampling (sampling aborted). [01:26:00] [5] Mosaic substrata (coral rubble/coral framework/coral garden/sparse cobbles) with abundant K. porrecta and mixed corals. ROV surveys the site across the ridges. [01:44:00] [01:48:00] ROV stops for imagery and sampling of euplectellid sponge (1) with associated shrimps (2). END VIDEO [01:55:00]/20:29

Progression Start Duration Code Name
1[00:00:00]00:40:02M.AtMB.Ro.MixCorMixed cold water coral community on Atlantic mid bathyal rock and other hard substrata
2[00:40:03]01:15:10M.AtMB.Bi.CorRee.LopFraMixed coral assemblage on Atlantic mid bathyal Lophelia pertusa reef framework (biogenic structure)

Porifera
Euplectella suberea : 1198 : R
Aphrocallistes beatrix : 264 : R
cf. Phakellia ventilabrum : 202 : R
cf. Polymastia penicillus : 1137 : R
Porifera encrusting globose (pale) : 75 : R
Porifera encrusting sp. 15 (yellow) : 58 : R
Porifera encrusting sp. 15 (yellow) : 58 : R
Porifera encrusting sp. 2 : 7 : R
Porifera lamellate sp. 10 : 1010 : R
Cnidaria
Actiniaria sp. 20 : 605 : R
Phelliactis sp. 1 : 255 : R
Antipathes dichotoma : 1187 : R
Stichopathes cf. gravieri : 283 : R
Stichopathes sp. : 560 : R
Phanopathes sp. 1 : 330 : R
Chrysopathes sp. Trissopathes sp. : 540 : R
Leiopathes sp. : 305 : R
Bathypathes sp. (brown) : 284 : R
Bathypathes sp. 1 : 328 : R
Parantipathes sp. : 1042 : R
Stauropathes arctica : 547 : R
Corallimorphidae sp. 2 : 43 : R

Caryophyllia sp. 2 : 6 : R
Lophelia pertusa : 250 : R
Madrepora oculata : 251 : R
Anthomastus grandiflorus : 278 : R
Anthothela grandiflora : 311 : R
cf. Clavulariidae sp. : 289 : R
Acanella arbuscula : 585 : R
Acanella arbuscula (firtree) : 991 : R
Gersemia sp. 3 : 1022 : R
Gorgonacea sp. 7 (pink) cf. Isidella : 307 : R
Arthropoda
Chirostylidae sp. 1 (indet.) : 285 : R
Chaceon affinis : 254 : R
Munida tenuimana : 339 : R
Caridea (indet.) : 1077 : R
Bathynectes sp. : 235 : R
Munidopsis sp. : 1126 : R
Mollusca
Muusoctopus johnsonianus : 1194 : R
Echinodermata
Koehlermetra porrecta : 315 : R
Crinoidea sp. 1 : 131 : R
Gorgonocephalus sp. 1 : 214 : R
Ophiuroidea (indet.) : 1076 : R

Ophiuroidea sp. 7 - yellow : 340 : R
Brisingidae sp. : 274 : R
cf. Henricia sp. (deep) : 1154 : R
Ceramaster/Peltaster/Plinthaster sp. 1 : 234 : R
Porania sp. : 263 : R
Pterasteridae sp. : 299 : R
Echinidae sp. (pink) : 194 : R
Cidaris cidaris : 211 : R
Araeosoma fenestratum : 188 : R
cf. Psolus sp. : 1049 : R
Parastichopus tremulus : 266 : R
Chordata
Synaphobranchus kaupii : 440 : R
Macrouridae sp. (cf. Coelorhynchus) : 1172 : R
Lepidion cf. guentheri : 1160 : R
Lepidion eques : 249 : R
Mora moro : 349 : R
Phycis blennoides : 1020 : R
Lophius piscatorius : 273 : R
Helicolenus dactylopterus : 227 : R

Number of species = 62

© Marine Institute, MERC Consultants, Bernard Picton 2022