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Deep-sea surface-dwelling enteropneusts from the Mid-Atlantic Ridge: Their ecology, distribution and mode of life

Deep-sea surface-dwelling enteropneusts from the Mid-Atlantic Ridge: Their ecology, distribution and mode of life
Deep-sea surface-dwelling enteropneusts from the Mid-Atlantic Ridge: Their ecology, distribution and mode of life
The ecology, distribution and mode of life of three species of surface-dwelling enteropneusts is described, based on ROV observations and samples on the flanks of the Northern Mid-Atlantic Ridge (MAR) at comparative stations north and south of the Sub-Polar Front. Tergivelum cinnabarinum was most abundant in the north (mean=4.56 ind. 1000 m?2±3.50 s.d.) and occurred at low densities in the south (mean=1.19±1.68 s.d.). Yoda purpurata was dominant in the south (mean=17.00 ind. 1000 m?2±12.32 s.d.) but only one individual was found in the north. The within-station distribution of all enteropneust species encountered was generally random. T. cinnabarinum was larger (mean total length 142 mm) than Y. purpurata (mean total length 70 mm). Size distributions suggested smaller individuals of both species on the western side of the MAR. Size and density of enteropneusts were generally higher in areas with higher carbon flux to the seafloor. A single individual of Allapasus isidis was observed drifting and settling to the seafloor at the SW site. Traces on the seafloor made by T. cinnabarinum covered a much higher percentage of the total seabed area surveyed (mean=0.323%±0.155 s.d.) than those of Y. purpurata (mean=0.034%±0.037 s.d.). Stable isotope values for T. cinnabarinum suggested that it was a typical surficial deposit feeder. Enteropneusts appear to be abundant and an important bioturbator on the sedimented seafloor of the MAR at around 2500 m depth.
Acorn worms, Hemichordates, Tergivelum cinnabarinum, Yoda purpurata, Allapasus isidis, Benthic, Remotely operated vehicle, Mid-Atlantic Ridge, Photograph
0967-0645
374-387
Jones, Daniel O.B.
44fc07b3-5fb7-4bf5-9cec-78c78022613a
Alt, Claudia H.S.
aa8e3324-b74b-4678-b0e0-1cc1b1b80517
Priede, Imants G.
2e513dae-a9dd-45ed-8359-cee7e56e3097
Reid, William D.K.
40d8b78a-635c-4bba-a861-d64d5d4daefe
Wigham, Benjamin D.
01711c28-8b86-4e1d-bade-fba8ede0a633
Billett, David S.M.
aab439e2-c839-4cd2-815c-3d401e0468db
Gebruk, Andrey V.
186856d2-fcda-4b40-905b-a03dc8b88623
Rogacheva, Antonina
243fa2a0-f901-4dce-95aa-41afc762a2d7
Gooday, Andrew J.
d9331d67-d518-4cfb-baed-9df3333b05b9
Jones, Daniel O.B.
44fc07b3-5fb7-4bf5-9cec-78c78022613a
Alt, Claudia H.S.
aa8e3324-b74b-4678-b0e0-1cc1b1b80517
Priede, Imants G.
2e513dae-a9dd-45ed-8359-cee7e56e3097
Reid, William D.K.
40d8b78a-635c-4bba-a861-d64d5d4daefe
Wigham, Benjamin D.
01711c28-8b86-4e1d-bade-fba8ede0a633
Billett, David S.M.
aab439e2-c839-4cd2-815c-3d401e0468db
Gebruk, Andrey V.
186856d2-fcda-4b40-905b-a03dc8b88623
Rogacheva, Antonina
243fa2a0-f901-4dce-95aa-41afc762a2d7
Gooday, Andrew J.
d9331d67-d518-4cfb-baed-9df3333b05b9

Jones, Daniel O.B., Alt, Claudia H.S., Priede, Imants G., Reid, William D.K., Wigham, Benjamin D., Billett, David S.M., Gebruk, Andrey V., Rogacheva, Antonina and Gooday, Andrew J. (2013) Deep-sea surface-dwelling enteropneusts from the Mid-Atlantic Ridge: Their ecology, distribution and mode of life. Deep Sea Research Part II: Topical Studies in Oceanography, 98, 374-387. (doi:10.1016/j.dsr2.2013.05.009).

Record type: Article

Abstract

The ecology, distribution and mode of life of three species of surface-dwelling enteropneusts is described, based on ROV observations and samples on the flanks of the Northern Mid-Atlantic Ridge (MAR) at comparative stations north and south of the Sub-Polar Front. Tergivelum cinnabarinum was most abundant in the north (mean=4.56 ind. 1000 m?2±3.50 s.d.) and occurred at low densities in the south (mean=1.19±1.68 s.d.). Yoda purpurata was dominant in the south (mean=17.00 ind. 1000 m?2±12.32 s.d.) but only one individual was found in the north. The within-station distribution of all enteropneust species encountered was generally random. T. cinnabarinum was larger (mean total length 142 mm) than Y. purpurata (mean total length 70 mm). Size distributions suggested smaller individuals of both species on the western side of the MAR. Size and density of enteropneusts were generally higher in areas with higher carbon flux to the seafloor. A single individual of Allapasus isidis was observed drifting and settling to the seafloor at the SW site. Traces on the seafloor made by T. cinnabarinum covered a much higher percentage of the total seabed area surveyed (mean=0.323%±0.155 s.d.) than those of Y. purpurata (mean=0.034%±0.037 s.d.). Stable isotope values for T. cinnabarinum suggested that it was a typical surficial deposit feeder. Enteropneusts appear to be abundant and an important bioturbator on the sedimented seafloor of the MAR at around 2500 m depth.

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More information

Published date: 15 December 2013
Keywords: Acorn worms, Hemichordates, Tergivelum cinnabarinum, Yoda purpurata, Allapasus isidis, Benthic, Remotely operated vehicle, Mid-Atlantic Ridge, Photograph
Organisations: Ocean and Earth Science, Marine Biogeochemistry

Identifiers

Local EPrints ID: 360975
URI: http://eprints.soton.ac.uk/id/eprint/360975
ISSN: 0967-0645
PURE UUID: 396ddbec-82e0-4c22-a321-bae7a3319669

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Date deposited: 08 Jan 2014 13:49
Last modified: 09 Jan 2022 07:12

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Contributors

Author: Daniel O.B. Jones
Author: Claudia H.S. Alt
Author: Imants G. Priede
Author: William D.K. Reid
Author: Benjamin D. Wigham
Author: David S.M. Billett
Author: Andrey V. Gebruk
Author: Antonina Rogacheva
Author: Andrew J. Gooday

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