Marine Institute
SeaRover Dive Video

D471 Transect 37 Mud or mud veneered cobbled/boulders, rare corals, mostly urchins and holothurians, another juvenile holothurian aggregation. Features of Interest: canyon, escarpments Water Depth: 1979-1742 m

Highlights: Pink holothurian

No description.

START VIDEO [00:00:00]/04:57 [1] Transect starts on mud, view immediately obscured by disturbed sediment. [00:02:00] vision clears, an aggregation of juvenile holothurians (possibly Amperima sp.) dominates. [00:09:00] [2]: boulders/cobbles with mud veneer with Ophiomusa lymani [00:09:00] [3]: Mud with sparse cobbles, co dominance between juvenile holothurians and O. lymani. [00:10:00] [4]: patchy boulders/cobbles with mud veneer mosaicked with mud with Ophiomusa lymani. Rarely corals are also present. [00:13:00] [5]: mud with sparse white echinoids. [00:14:00] [6]: cobbles/boulders with mud veneer and O. lymani [00:17:00] [7]: mud rare boulders patchy echinoids, sometimes no dominant epifauna. [00:28:00] an aggregation of juvenile/small jellyfish in the water column (appear black, like marine snow, but are red and do not settle on the seabed) continues for a few mins. [00:30:00] [8]: mud veneered boulders with O. lymani. [00:31:00] [9]: boulders with mud veneer, then mud, both with echinoids dominating. [00:33:00] [10] boulders/cobbles, then mud, with O. lymani and sparse corals. [00:35:00] [11] much with echinoids displaying patchy dominance, sometimes no dominant epifauna . [00:50:00] [12] cobbles/boulders and heavy mud veneer with O. lymani and sparse corals. [00:51:00] [13] mud with O. lymani, sometimes sparse epifauna. [00:52:00] [14] echinoids again, sometimes rare cobbles sometimes no dominant fauna. [01:05:00] Change from Echinidae sp . to Phormosoma placenta as the dominant echinoids. [01:06:00] Frequent Zoroaster fulgens (slender arm morph). [01:25:00] [15] patchy cobbles on mud with O. lymani and sparse mixed corals (especially Paramuricea sp.). [01:32:00] [16] P. placenta on mud. [01:32:00] [17] cf. Amperima sp . (adults) on mud. [01:36:00] [18] Echinidae sp. again dominate (aggregation), mud continues. [01:37:00] [19] more holothurians. [01:40:00] [20] another Echnidae sp. aggregation. [01:43:00] [21] holothurians on mud. [01:53:00] [22] Echinidae sp. on mud. [01:53:00] [23] holothurians with rare mixed corals on sparse boulders. END VIDEO [01:56:00]/06:54.

Progression Start Duration Code Name
1[00:00:00]00:09:15M.AtUA.Mu.HolComHolothurian dominated community on Atlantic upper abyssal mud
2[00:09:15]00:00:22M.AtLB.Mx.SurOph.OphCerOphiomusa lymani and cerianthid anemone assemblage on Atlantic lower bathyal mixed sediment
3[00:09:38]00:00:40M.AtUA.Mu.HolComHolothurian dominated community on Atlantic upper abyssal mud
4[00:10:19]00:03:23M.AtLB.Mx.SurOph.OphCerOphiomusa lymani and cerianthid anemone assemblage on Atlantic lower bathyal mixed sediment
5[00:13:43]00:00:34M.AtLB.Mu.UrcComUrchin dominated community on Atlantic lower bathyal mud
6[00:14:18]00:03:20M.AtLB.Mx.SurOph.OphCerOphiomusa lymani and cerianthid anemone assemblage on Atlantic lower bathyal mixed sediment
7[00:17:39]00:13:04M.AtLB.Mu.UrcComUrchin dominated community on Atlantic lower bathyal mud
8[00:30:44]00:00:46M.AtLB.Mx.SurOph.OphCerOphiomusa lymani and cerianthid anemone assemblage on Atlantic lower bathyal mixed sediment
9[00:31:31]00:02:00M.AtLB.Mu.UrcComUrchin dominated community on Atlantic lower bathyal mud
10[00:33:32]00:02:19M.AtLB.Mx.SurOph.OphCerOphiomusa lymani and cerianthid anemone assemblage on Atlantic lower bathyal mixed sediment
11[00:35:52]00:14:24M.AtLB.Mu.UrcComUrchin dominated community on Atlantic lower bathyal mud
12[00:50:17]00:01:13M.AtLB.Mx.SurOph.OphCerOphiomusa lymani and cerianthid anemone assemblage on Atlantic lower bathyal mixed sediment
13[00:51:31]00:01:21M.AtLB.Mx.SurOph.OphCerOphiomusa lymani and cerianthid anemone assemblage on Atlantic lower bathyal mixed sediment
14[00:52:53]00:32:15M.AtLB.Mu.UrcComUrchin dominated community on Atlantic lower bathyal mud
15[01:25:09]00:01:01M.AtLB.Mx.SurOph.OphCerOphiomusa lymani and cerianthid anemone assemblage on Atlantic lower bathyal mixed sediment
16[01:26:11]00:06:14M.AtLB.Mu.UrcComUrchin dominated community on Atlantic lower bathyal mud
17[01:32:26]00:03:49M.AtUA.Mu.HolComHolothurian dominated community on Atlantic upper abyssal mud
18[01:36:16]00:00:41M.AtLB.Mu.UrcComUrchin dominated community on Atlantic lower bathyal mud
19[01:36:58]00:03:57M.AtUA.Mu.HolComHolothurian dominated community on Atlantic upper abyssal mud
20[01:40:56]00:02:38M.AtLB.Mu.UrcComUrchin dominated community on Atlantic lower bathyal mud
21[01:43:35]00:09:31M.AtUA.Mu.HolComHolothurian dominated community on Atlantic upper abyssal mud
22[01:53:07]00:00:33M.AtLB.Mu.UrcComUrchin dominated community on Atlantic lower bathyal mud
23[01:53:41]00:03:17M.AtUA.Mu.HolComHolothurian dominated community on Atlantic upper abyssal mud

Porifera
Porifera lamellate sp. 10 : 1010 : O
Blue Porifera encrusting : 800 : R
Cnidaria
Cerianthidae sp. 1 : 2 : R
Actiniaria sp. 20 : 605 : R
cf. Halcampoididae sp. : 984 : R
Actinernus michaelsarsi : 554 : R
Phelliactis sp. 1 : 255 : R
Stauropathes arctica : 547 : R
Caryophyllia sp. 2 : 6 : R
Flabellum sp. : 1056 : R
Anthomastus grandiflorus : 278 : R
Paramuricea sp. : 1050 : R
Pennatulacea (indet.) : 1114 : O
Anthoptilum grandiflorum : 594 : R
Pennatula aculeata : 1046 : O
Umbellula sp. : 581 : R

Branchiocerianthus norvegicus : 1069 : R
Annelida
Serpulidae sp. 1 : 106 : R
Arthropoda
Caridea (indet.) : 1077 : R
Munnopsidae sp. : 1102 : R
Mollusca
Colus sp. : 113 : R
Echinodermata
Asteronyx loveni : 471 : R
Ophiomusa lymani : 551 : F
Brisingidae sp. : 274 : O
Zoroaster fulgens : 988 : F
Pseudarchaster sp. 1 : 433 : R
Echinidae sp. (white) : 559 : F
Hygrosoma sp. : 1125 : O
Phormosoma placenta : 555 : O
cf. Amperima sp. : 628 : F

Benthothuria sp. : 1124 : O
Chordata
Hydrolagus cf. affinis : 1039 : O
Synaphobranchus kaupii : 440 : O
Coryphaenoides guentheri : 577 : O
Coryphaenoides rupestris : 566 : R
Trachyrincus sp. : 446 : O
Mora moro : 349 : O
Halosauridae sp. : 1113 : O
Polyacanthonotus rissoanus : 552 : R
Notacanthiformes (indet.) : 1034 : R
cf. Rouleina attrita : 1074 : O
Zoarcidae sp. 2 : 291 : R
Actinopterygii sp. 3 : 930 : R

Number of species = 43

© Marine Institute, MERC Consultants, Bernard Picton 2022