 | |||||
|
|||||
| About | Mapping | Dive list | Listed species | Pressures | Species - OTUs |
D532 Transect RB07 Deep sea sponge aggregations on hard substrata with patches of Solenosmilia. Priority. Features: Escarpment, Ridge, SAC. Water depth: -1450 m. TL: 3.1 km. SOL: 14° 14.944' W 56° 11.158' N
Highlights: Yellow & white sponges Antipatharian coral Shark Hexactinellid sponge - Pheronema
Xenophyophore fields on soft sediment with sponge aggregations (lamellate, encrusting and lobose) are common throughout.The sponge Pheronema carpenteri occurs occasionally (approximately 10 throughout the dive). Solenosmilia reef occurs on top of a small carbonate mound. Corals included Paramuricea sp. were observed, with several large Eknomisis sp. and Leiopathes sp. present towards the end of the dive on carbonate sediment with mud overlay.
START VIDEO [1] [00:00:00]/20:37 Transect starts on a moderate slope of muddy sediment with occasional cobbles and boulders and many juvenile Coryphaenoides rupestris and Synaphobranchus kaupii being encountered. Encrusted sponges with patches of dead Solenosmilia variabilis reefs predominantly cover boulders. [2] [00:19:00] The boulders become more abundant and prevail on muddy sediment. Porifera lamellate (hexactinosida) dominate the site. At [00:20:00] the ROV zooms on the muddy sediment, which reveals a small sea pen field (poss Distichoptilum gracile) (<5x5m). [3] [00:35:00] Porifera (poss Pheronema carpenteri) dominates the muddy and pebble substrate for a short distance [4] [00:41:00] Here colonies of Solenosmilia reefs. Muddy sediment with occasional boulders become more abundant again, where porifera lamellate (hexactinosida) dominates. [5] [00:49:00] The ROV reaches a carbonate summit wtih a small patch of Solenosmilia variabilis framework. [6] [00:52:00] The ROV descends the summit, travelling down on a moderate muddy slope with abundant boulders where, again, porifera lamellate (hexactinosida) dominates. [7] [00:56:00] The muddy sediment is substituted with pebbles, while boulders persist. Towards the end of the video, deep sea sponge aggregations –including encrusting- are widely spread on hard substrata. END VIDEO 22:13.
| Progression | Start | Duration | Code | Name |
|---|---|---|---|---|
| 1 | [00:00:02] | 00:28:21 | M.AtLB.Mu | Atlantic lower bathyal mud |
| 2 | [00:28:24] | 00:16:56 | M.AtLB.Ro.DeeSpo | Deep sponge aggregations on Atlantic lower bathyal rock and other hard substrata |
| 3 | [00:45:21] | 00:04:51 | M.AtLB.Mu | Atlantic lower bathyal mud |
| 4 | [00:50:13] | 00:05:27 | M.AtLB.Bi.CorRee | Atlantic lower bathyal cold water coral reef (biogenic structure) |
| 5 | [00:55:41] | 00:05:32 | M.AtLB.Ro.DeeSpo | Deep sponge aggregations on Atlantic lower bathyal rock and other hard substrata |
| 6 | [01:01:14] | 00:11:49 | M.AtLB.Mu | Atlantic lower bathyal mud |
| 7 | [01:13:04] | 00:22:35 | M.AtLB.Ro.DeeSpo | Deep sponge aggregations on Atlantic lower bathyal rock and other hard substrata |
Porifera
Hyalonema sp. 1 : 917 : R
Pheronema carpenteri : 347 : R
cf. Phakellia ventilabrum : 202 : R
Mycale lingua : 171 : R
Porifera encrusting (blue) : 532 : R
Porifera encrusting sp. 1 (white) : 1 : R
Porifera encrusting sp. 18 (cream) : 105 : R
Porifera lamellate (Hexactinosida) : 1151 : R
Porifera lamellate sp. 10 (Yellow Solenosmilia assoc.) : 623 : R
Porifera lamellate sp. 9 : 606 : R
Porifera massive globose sp. 13 : 648 : R
Porifera massive lobose sp. 18 (cf. Farrea sp. ) : 576 : R
Porifera massive lobose sp. 22 (yellow cf. Hertwigia sp. ) : 616 : R
Porifera massive lobose sp. 30 : 982 : R
Porifera massive lobose sp. 32 : 1090 : R
Cnidaria
Cerianthidae sp. 1 : 2 : R
Actiniaria sp. 13 (pink/purple) : 478 : R
Actiniaria sp. 20 : 605 : R
Actiniidae sp. (sand Bolocera) : 41 : R
Adamsia sp. : 1066 : R
Phelliactis sp. 1 : 255 : R
Stichopathes sp. : 560 : R
Leiopathes sp. : 305 : R
Parantipathes sp. : 1042 : R
Stauropathes arctica : 547 : R
Caryophyllia sp. 2 : 6 : R
Caryophyllia sp. 5 (bullseye) : 584 : R
Lophelia pertusa : 250 : R
Anthomastus grandiflorus : 278 : R
Anthothela grandiflora : 311 : R
Acanella arbuscula : 585 : R
Eknomisis sp. : 649 : R
Paragorgia (twiggy) (poss. Swiftia) : 1065 : R
Anthoptilum sp. : 1107 : R
Pennatula aculeata : 1046 : R
Distichoptilum gracile : 1108 : R
Rhodaliidae sp. 1 : 950 : R
Annelida
Aphroditidae sp. 1 : 146 : R
Arthropoda
Chirostylidae sp. 1 (indet.) : 285 : R
Munida tenuimana : 339 : R
Paguridae sp. : 205 : R
Colossendeis sp. 1 : 1059 : R
Cirripedia sp. 1 : 82 : R
Eucarida sp. (red deep) : 1138 : O
Mollusca
Colus sp. : 113 : R
Graneledone verrucosa : 973 : R
Echinodermata
Pentametrocrinus atlanticus : 436 : R
Crinoidea sp. : 1072 : R
Crinoidea sp. 1 : 131 : R
Euryalida sp. : 1307 : R
Ophiomusa lymani : 551 : R
Brisingidae sp. : 274 : R
Pseudarchaster sp. 1 : 433 : R
Henricia sanguinolenta : 208 : R
Ceramaster/Peltaster/Plinthaster sp. 1 : 234 : R
Solasteridae sp. (7 arm) : 1061 : R
Solasteridae sp. (white) : 9977 : R
Echinus sp. (deep, white/pink) : 1052 : R
Cidaris cidaris : 211 : R
Phormosoma placenta : 555 : R
cf. Amperima sp. : 628 : R
Benthogone sp. : 432 : R
Chordata
Apristurus profundorum : 1082 : R
Rajiformes sp. 1 (Neoraja caerulea?) : 652 : R
Chimaera opalescens : 653 : R
Synaphobranchus kaupii : 440 : O
Ipnopidae sp. : 1078 : R
Coryphaenoides guentheri : 577 : O
Coryphaenoides rupestris : 566 : R
Trachyrincus sp. : 446 : R
Lepidion eques : 249 : R
Neocyttus helgae : 563 : R
Actinopterygii sp. 3 : 930 : R
Number of species = 73
© Marine Institute, MERC Consultants, Bernard Picton 2022