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D695 Transect 12 Interspersed geogenic and biogenic reefs across the dive featuring Solenosmilia variabilis reefs and deep-sea sponge aggregations on hard substrata and sparse coral rubble on soft sediment. P1. Water depth: 1646 -1500m. Feature: Interesting bathymetric data
Highlights: Lamellate sponge Hexactinellid sponge Antipatharian coral - Stichopathes Soft coral - Anthomastus Soft coral - Paramuricea Large white sponge Yellow sea fan Sponges & sea fan Epizoanthus pagurophilus Blue encrusting sponge Starfish
Of Note: Solenosmilia coral garden.
Followed planned transect (~50 m) before turning west up-slope. A seafloor of pebble/cobble substrate and occasional rocks transitioning to fine sediment coral rubble upslope. A diverse coral garden is observed, with Solenosmilia variabilis, Paramuricea sp. and sponges (various morphotypes). Hermit crabs with zooanthids are common throughout the dive. Some litter encountered.
START VIDEO [00:00:00]/05:08. Interspersed geogenic and biogenic reefs across the dive featuring Solenosmilia variabilis reefs and deep-sea sponge aggregations on hard substrata and sparse coral rubble on soft sediment. [1] The dive starts on soft sediment on steep slope with boulder/pebbles and aggregation of corals and sponges. [00:02:00] ROV stops for sampling two push cores. [00:10:00] [2] Geogenic reef with lamellate sponges, Paramuricea sp. and Stichopathes sp. living on rock and mud. [00:13:00] Mud cloud/ obscured vision for a few seconds. [00:25:00] [3] Massive lobose sponges, encrusting sponges, Solenosmilia colonies and Acanthogorgia armata living on mud and cobbles. [00:42:00] [4] Here sediment changes into coarse sediment with sparse epifauna including Epizoanthus sp. 1 and Ceriantharia. [00:48:00] [5] Geogenic reefs recorded on frequent boulders with Solenosmilia colonies, solitary scleractinians, Paguridae and Epizoanthus sp. 1. [00:58:00] Obscured vision. [01:02:00] [6] Coral rubble starts to be consistent and uniform on moderate coarse sediment slope. A few lamellate sponges and encrusted species present on cobbles and boulders. [01:16:00] Mud cloud/obscured vision. END VIDEO [01:18:00]/06:20.
| Progression | Start | Duration | Code | Name |
|---|
Porifera
cf. Phakellia ventilabrum : 202 : O
Porifera cup 2 : 535 : R
Porifera encrusting sp. 1 (white) : 1 : R
Porifera encrusting sp. 15 (yellow) : 58 : R
Porifera lamellate (bubbles) : 1156 : R
Porifera lamellate sp. 9 : 606 : F
Porifera massive lobose sp. 32 : 1090 : R
Blue Porifera encrusting : 800 : R
Cnidaria
Cerianthidae sp. 1 : 2 : R
Actiniaria sp. 18 : 582 : R
Actiniaria sp. 20 : 605 : R
Actinernus michaelsarsi : 554 : R
Stichopathes cf. gravieri : 283 : F
Bathypathes sp. 2 : 561 : R
Corallimorphidae sp. 1 : 39 : R
Caryophyllia sp. 2 : 6 : R
Solenosmilia variabilis : 700 : R
Epizoanthus sp. 1 (Paguridae associated) : 317 : R
Acanthogorgia cf. armata : 608 : R
Pseudoanthomastus sp. : 1080 : R
Anthothela grandiflora : 311 : R
Anthothela grandiflora : 311 : R
Chrysogorgidae sp. 1 : 1008 : R
Acanella arbuscula : 585 : R
Eknomisis sp. : 649 : R
Lepidisis sp. : 557 : R
Paragorgia (twiggy) (poss. Swiftia) : 1065 : F
Paramuricea sp. : 1050 : F
Plexauridae sp. (deep) : 1192 : R
Halipteris cf. finmarchica : 622 : R
Kophobelemnon stelliferum : 442 : R
Pennatula aculeata : 1046 : R
Annelida
Aphroditidae sp. 1 : 146 : R
Arthropoda
Neolithodes grimaldii : 1063 : R
Paguridae sp. : 205 : R
Caridea (indet.) : 1077 : R
Brachiopoda
Brachiopoda sp. 1 : 34 : R
Mollusca
Hypsogastropoda sp. : 621 : R
Echinodermata
Koehlermetra porrecta : 315 : R
Euryalida sp. : 1307 : R
Ophiomusa lymani : 551 : R
Zoroaster fulgens : 988 : R
Pseudarchaster sp. 1 : 433 : R
Porania sp. : 263 : R
Solaster endeca : 573 : R
Velatida sp. 1 : 199 : R
Echinus sp. : 445 : R
cf. Benthogone sp. (white) : 574 : R
Benthogone sp. : 432 : R
Mesothuria intestinalis : 536 : R
Holothuroidea sp. (pink deep) : 1179 : R
Chordata
Ascidiacea sp. 2 : 20 : R
Galeus sp. : 1305 : R
Squaliformes sp. : 569 : R
Chimaera monstrosa : 265 : R
Chimaera opalescens : 653 : R
Synaphobranchus kaupii : 440 : R
Ipnopidae sp. : 1078 : R
Hoplostethus atlantica : 651 : R
Coryphaenoides rupestris : 566 : R
Trachyrincus sp. : 446 : R
Antimora sp. : 1301 : R
Polyacanthonotus rissoanus : 552 : R
cf. Rouleina attrita : 1074 : R
Cottunculus microps : 128 : R
Neocyttus helgae : 563 : R
Actinopterygii sp. 3 : 930 : R
Number of species = 67
© Marine Institute, MERC Consultants, Bernard Picton 2022