Marine Institute
SeaRover Dive Video

D574 Transect PB22 Notable biogenic and geogenic Lophelia reefs. Not Priority. Features: SAC, Mound, Ridge. Water depth: -880 m. TL: 1.7km SOL: 12° 45.772' W 52° 9.556' N

Highlights: Extensive reef of pink & white Lophelia Crab - Paromola cuvieri Sailfin rough shark on Lophelia reef

A steep muddy incline with small cobbles. Scattered Lophelia pertusa reefs become more dense, with up to 50% living. Coral gardens with Stichopathes cf. graviere, Leiopathes sp. and Ceriantharia sp. were observed. Towards the end of the dive the coral reef becomes less common and the echinoid Cidaris cidaris occurs.

START VIDEO [00:00:00]/03:32. ROV stops for sampling two pushcores. [00:15:00] Mud cloud. Steep muddy slope with scattered small cobbles. Cf. Psolus sp. OTU1049. [00:18:00] Mud/gravel/coral gravel/scattered cobbles. [00:25:00] Marine snow. Scattered Lophelia pertusa reefs (50% living, 50% dead). [00:28:00] L. pertusa reefs become dense. Stichopathes cf gravieri OTU198, Leiopathes sp. OTU305 and Ceriantharia OTU1069. [00:48:00] ROV reaches the top of the hill and then soon after descends the hill where coral reefs extend further (both living and dead). [00:52:00] ROVís camera tilts to water column. [00:53:00] Back to the sea floor vision where coral gardens persist. [00:58:00] Now coral reef is scattered. ROV goes down slope where sediments include mud/coral gravel. [01:03:00] [5] ROV goes up on mud/pebbles/cobbles on steep hill. Cidaris cidaris OTU211. [01:08:00] Mud/gravel/cobbles. [01:11:00] Now ROV going up hill. Sediments include coral gravel/mud. [01:12:00] L. pertusa (living/dead) reef is dense and at least 1 m tall. [01:31:00] Mud cloud. ROV stops for sampling L. pertusa coral. END VIDEO [01:37:49]/05:10.

Progression Start Duration Code Name
1[00:00:00]00:26:04M.AtMB.MuAtlantic mid bathyal mud
2[00:26:05]00:02:56M.AtMB.Bi.CorReeAtlantic mid bathyal cold water coral reef (biogenic structure)
3[00:29:02]00:27:40M.AtMB.Bi.CorRee.LopFraMixed coral assemblage on Atlantic mid bathyal Lophelia pertusa reef framework (biogenic structure)
4[00:56:43]00:13:13M.AtMB.Bi.CorReeAtlantic mid bathyal cold water coral reef (biogenic structure)
5[01:09:57]00:27:52M.AtMB.Bi.CorRee.LopFraMixed coral assemblage on Atlantic mid bathyal Lophelia pertusa reef framework (biogenic structure)

Porifera
Aphrocallistes beatrix : 264 : R
Blue Porifera encrusting : 800 : R
Cnidaria
Cerianthidae sp. 1 : 2 : R
Pachycerianthus multiplicatus : 458 : R
Actiniaria sp. 1 : 4 : R
Actiniaria sp. 20 : 605 : R
Phelliactis sp. 1 : 255 : R
Antipathes dichotoma : 1187 : R
Stichopathes cf. gravieri : 283 : R
Leiopathes sp. : 305 : R
Caryophyllia sp. 2 : 6 : R
Lophelia pertusa : 250 : R
Madrepora oculata : 251 : R
Epizoanthus sp. 1 (Paguridae associated) : 317 : R
Alcyonacea sp. 3 : 343 : R

Gorgonacea sp. 7 (pink) cf. Isidella : 307 : R
Hydrozoa (flat branched) : 56 : R
Annelida
Bonellia viridis : 267 : R
Arthropoda
Paromola cuvieri : 304 : R
Paguridae sp. : 205 : R
Caridea (indet.) : 1077 : R
Bathynectes sp. : 235 : R
Echinodermata
Stichastrella rosea : 198 : R
Porania sp. : 263 : R
cf. Echinus (deep pink spine) : 1129 : R
Cidaris cidaris : 211 : R
cf. Psolus sp. : 1049 : R
Benthogone sp. : 432 : R
Parastichopus tremulus : 266 : R

Chordata
Ascidiacea sp. 2 : 20 : R
Galeus melastomus : 1005 : R
Oxynotus paradoxus : 9984 : R
Synaphobranchus kaupii : 440 : R
Beryx decadactylus : 1025 : R
Nezumia aequalis : 1003 : R
Trachyrincus sp. : 446 : R
Macrouridae sp. (cf. Coelorhynchus) : 1172 : R
Lepidion eques : 249 : R
Mora moro : 349 : R
Phycis blennoides : 1020 : R
Helicolenus dactylopterus : 227 : R

Number of species = 41

© Marine Institute, MERC Consultants, Bernard Picton 2022