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Bathyal benthic megafauna from the Mid‐Atlantic Ridge in the region of the Charlie-Gibbs fracture zone based on remotely operated vehicle observations

Bathyal benthic megafauna from the Mid‐Atlantic Ridge in the region of the Charlie-Gibbs fracture zone based on remotely operated vehicle observations
Bathyal benthic megafauna from the Mid‐Atlantic Ridge in the region of the Charlie-Gibbs fracture zone based on remotely operated vehicle observations

Mid-ocean ridges are important geological features that cover around 33% of the global ocean floor, increase environmental heterogeneity on a regional scale and influence benthic community ecology. Benthic communities at the Mid-Atlantic Ridge (MAR) were studied at four contrasting sites, located east and west of the ridge, which were further separated into northern (54°N) and southern (48°N) sites by the Charlie-Gibbs Fracture Zone (CGFZ) and the Sub-Polar Front (SPF). The MAR in the CCFZ region area had flat areas surrounded by gentle slopes between rocky cliffs. A total of 32 remotely operated vehicle video transects (32,000 m2 of seafloor) were surveyed on the flat areas and sedimented slopes (10°). In total, 154 distinct taxonomic units were identified (from 9 phyla) across all sites. The sediments of the flat and sloping sites were generally similar, but differences were seen in the community composition and faunal abundance (~ 4 times higher in the flat sites, except at the northwestern site). Significant differences in abundance were observed between sites (highest in the northern sites). The two northern sites had distinct community compositions, while the two southern sites were similar. This suggests that the MAR acts as a stronger barrier between communities north of the CGFZ than it does to the south. There was high heterogeneity between transects and it was not possible to identify general drivers for the benthic megafauna at the MAR. Our results emphasize the limited knowledge of this vast system with its unique benthic megafauna.

Biogeography, Community ecology, Deep-sea, Imagery, Isolation, Mid-ocean ridge, Slope habitats
0967-0637
Alt, Claudia H.S.
b69734b9-ec6d-4d9e-b4c5-58de0473868b
Kremenetskaia (Rogacheva), Antonina
0010e866-962c-414c-bb4a-a5af51f3d456
Gebruk, Andrey V.
186856d2-fcda-4b40-905b-a03dc8b88623
Gooday, Andrew J.
d9331d67-d518-4cfb-baed-9df3333b05b9
Jones, Daniel O.B.
44fc07b3-5fb7-4bf5-9cec-78c78022613a
Alt, Claudia H.S.
b69734b9-ec6d-4d9e-b4c5-58de0473868b
Kremenetskaia (Rogacheva), Antonina
0010e866-962c-414c-bb4a-a5af51f3d456
Gebruk, Andrey V.
186856d2-fcda-4b40-905b-a03dc8b88623
Gooday, Andrew J.
d9331d67-d518-4cfb-baed-9df3333b05b9
Jones, Daniel O.B.
44fc07b3-5fb7-4bf5-9cec-78c78022613a

Alt, Claudia H.S., Kremenetskaia (Rogacheva), Antonina, Gebruk, Andrey V., Gooday, Andrew J. and Jones, Daniel O.B. (2018) Bathyal benthic megafauna from the Mid‐Atlantic Ridge in the region of the Charlie-Gibbs fracture zone based on remotely operated vehicle observations. Deep Sea Research Part I: Oceanographic Research Papers. (doi:10.1016/j.dsr.2018.12.006).

Record type: Article

Abstract

Mid-ocean ridges are important geological features that cover around 33% of the global ocean floor, increase environmental heterogeneity on a regional scale and influence benthic community ecology. Benthic communities at the Mid-Atlantic Ridge (MAR) were studied at four contrasting sites, located east and west of the ridge, which were further separated into northern (54°N) and southern (48°N) sites by the Charlie-Gibbs Fracture Zone (CGFZ) and the Sub-Polar Front (SPF). The MAR in the CCFZ region area had flat areas surrounded by gentle slopes between rocky cliffs. A total of 32 remotely operated vehicle video transects (32,000 m2 of seafloor) were surveyed on the flat areas and sedimented slopes (10°). In total, 154 distinct taxonomic units were identified (from 9 phyla) across all sites. The sediments of the flat and sloping sites were generally similar, but differences were seen in the community composition and faunal abundance (~ 4 times higher in the flat sites, except at the northwestern site). Significant differences in abundance were observed between sites (highest in the northern sites). The two northern sites had distinct community compositions, while the two southern sites were similar. This suggests that the MAR acts as a stronger barrier between communities north of the CGFZ than it does to the south. There was high heterogeneity between transects and it was not possible to identify general drivers for the benthic megafauna at the MAR. Our results emphasize the limited knowledge of this vast system with its unique benthic megafauna.

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More information

Accepted/In Press date: 24 December 2018
e-pub ahead of print date: 27 December 2018
Keywords: Biogeography, Community ecology, Deep-sea, Imagery, Isolation, Mid-ocean ridge, Slope habitats

Identifiers

Local EPrints ID: 427913
URI: http://eprints.soton.ac.uk/id/eprint/427913
ISSN: 0967-0637
PURE UUID: dada4be5-c5e8-4f8f-ab18-e7376223612a

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Date deposited: 04 Feb 2019 17:30
Last modified: 04 Feb 2019 17:30

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Contributors

Author: Claudia H.S. Alt
Author: Antonina Kremenetskaia (Rogacheva)
Author: Andrey V. Gebruk
Author: Andrew J. Gooday
Author: Daniel O.B. Jones

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