Marine Institute
SeaRover Dive Video

D539 Transect RB16 Mixed sediment slope with occasional Lophelia/Madrepora reefs on cobble/boulders and anemones/sea urchin on mud. Priority. Features: Escarpment, Straddles SAC. Water depth: -750 m. TL: 4.1 km SOL: 15° 0.381' W 55° 43.261' N

Highlights: Boulder with Lophelia & sponges Antipatharian coral Boulder with sponges & antipatharians

The seafloor is comprised of coral gravel and cobbles with no conspicuous epifauna. Lophelia pertusa/Madrepora oculata co-dominate with encrusted sponges on boulders. On cobbles and boulders with sparse coral gravel/rubble Porifera, Actiniaria, Stichopathes cf. gravieri and Cidaris cidaris are present. Towards end of dive the substrate changes to sand/gravel/sparse pebbles/cobbles/boulders. Porifera, mixed coral and Cirripedia species dominate on hard substrata and sparse C. cidaris as well as Araesoma fenestratum dominate the soft bottom substrate.

START VIDEO [00:00:00]/14:25 Lophelia reefs span across the transect (mainly gravel and rubble). [1] Coral gravel and cobbles with no dominant epifauna. [00:11:00] ROV leaves the bottom and descends slowly again. [00:27:00] [2] Lophelia pertusa/Madrepora oculata co-dominates with encrusted sponges on boulders. Coral gravel is the main substrata type. [00:34:00] [3] Cobbles and boulders with sparse coral gravel/rubble with co-dominant Porifera, Actiniaria, Stichopathes cf. gravieri OTU283 and Cidaris cidaris OTU211. [00:39:00]-[00:45:00] ROV stops for sampling 1 pushcore. [00:49:00]-[00:55:00] ROV stops for imagery and sampling (Aphrocallistes sp. OTU264 with associated Zoanthidea sp. OTU1149). [01:15:00] [4] Now sand/gravel/sparse pebbles/cobbles/boulders. Porifera, mixed coral and Cirripedia species dominate on hard substrata and sparse C. cidaris as well as Araeosoma fenestratum on soft bottom substrata. END VIDEO [01:30:00]/15:56.

Progression Start Duration Code Name
1[00:00:00]01:04:18M.AtMB.Bi.CorRee.LopFraMixed coral assemblage on Atlantic mid bathyal Lophelia pertusa reef framework (biogenic structure)
2[01:04:19]00:01:42M.AtMB.Bi.CorRee.LopFraMixed coral assemblage on Atlantic mid bathyal Lophelia pertusa reef framework (biogenic structure)
3[01:06:02]00:22:09M.AtMB.RoAtlantic mid bathyal rock and other hard substrata
4[01:28:12]00:01:56M.AtMB.Bi.CorReeAtlantic mid bathyal cold water coral reef (biogenic structure)

Porifera
Aphrocallistes beatrix : 264 : R
cf. Phakellia ventilabrum : 202 : R
cf. Polymastia penicillus : 1137 : R
Geodia cf. atlantica (Porifera massive lobose sp. 6) : 83 : R
Porifera cylindrical sp. 2 : 1075 : R
Porifera encrusting sp. 1 (white) : 1 : R
Porifera encrusting sp. 18 (cream) : 105 : R
Porifera encrusting sp. 2 : 7 : R
Cnidaria
Actiniaria sp. 20 : 605 : R
Antipathes dichotoma : 1187 : R
Stichopathes cf. gravieri : 283 : R
Chrysopathes sp. Trissopathes sp. : 540 : R
Leiopathes sp. : 305 : R
Parantipathes sp. : 1042 : R
Stauropathes arctica : 547 : R

Lophelia pertusa : 250 : R
Madrepora oculata : 251 : R
Zoanthidea sp. : 1149 : R
Anthomastus grandiflorus : 278 : R
Acanella arbuscula (firtree) : 991 : R
Lepidisis sp. : 557 : R
Paramuricea sp. : 1050 : R
Callogorgia verticillata : 280 : R
Arthropoda
Chirostylidae sp. 1 (indet.) : 285 : R
Chaceon affinis : 254 : R
Munidopsis sp. : 1126 : R
Cirripedia sp. 1 : 82 : R
Echinodermata
Ophiuroidea (indet.) : 1076 : R
Ceramaster/Peltaster/Plinthaster sp. 1 : 234 : R
Porania sp. : 263 : R

Cidaris cidaris : 211 : R
Araeosoma fenestratum : 188 : R
Parastichopus tremulus : 266 : R
Chordata
Synaphobranchus kaupii : 440 : R
Molva molva : 654 : R
Coryphaenoides rupestris : 566 : R
Macrouridae sp. (cf. Coelorhynchus) : 1172 : R
Lepidion cf. guentheri : 1160 : R
Mora moro : 349 : R
Lophius piscatorius : 273 : R
Cottunculus microps : 128 : R

Number of species = 41

© Marine Institute, MERC Consultants, Bernard Picton 2022