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New insights on coral mound development from groundtruthed high-resolution ROV-mounted multibeam imaging

New insights on coral mound development from groundtruthed high-resolution ROV-mounted multibeam imaging
New insights on coral mound development from groundtruthed high-resolution ROV-mounted multibeam imaging

Currents play a vital role in sustaining and developing deep water benthic habitats by mobilising food and nutrients to otherwise relatively barren parts of the seabed. Where sediment supply is significant, it can have a major influence on the development and morphology of these habitats. This study examines a segment of the Belgica Mound Province, NE Atlantic to better constrain the processes affecting a small-sized cold water coral (CWC) mound habitat and conversely, the hydrodynamic influence of CWC mounds on their own morphological development and surroundings. Here, we utilise ROV-mounted multibeam, ROV-video data, and sediment samples to investigate current processes, mound morphology, density and development. Detailed mapping shows that the area may have the highest density of coral mounds recorded so far, with three distinct mound types defined based on size, morphology and the presence and degree of distinct scour features. A residual current of 36–40 cm s−1 is estimated while large scour features suggest low-frequency, high-magnitude events. These 3 mound types are i) smaller mounds with no scour; ii) mounds with scour in one to two distinct directions and; iii) larger mounds with mound encircling scour. The differing mound types likely had a staggered initiation where younger mounds preferentially developed near clusters of pre-existing mounds. Given the high density of these small CWC mounds, we support the hypothesis that over time, this clustering may eventually lead to these mounds coalescing into larger coral mound features.

Bedforms, Cold water coral mounds, Currents, Habitat mapping, Sediments
0025-3227
225-237
Lim, Aaron
746235ae-9683-41b4-ad35-8d9eee1ef1c5
Huvenne, Veerle A.I.
f22be3e2-708c-491b-b985-a438470fa053
Vertino, Agostina
4f34a45a-ff8e-4ee3-b4d1-95db1c72db8e
Spezzaferri, Silvia
23b9479a-80bc-49c5-9f24-6c7c736f7220
Wheeler, Andrew J.
0f243ba3-3aae-470c-ba4a-46a8c4b9197a
Lim, Aaron
746235ae-9683-41b4-ad35-8d9eee1ef1c5
Huvenne, Veerle A.I.
f22be3e2-708c-491b-b985-a438470fa053
Vertino, Agostina
4f34a45a-ff8e-4ee3-b4d1-95db1c72db8e
Spezzaferri, Silvia
23b9479a-80bc-49c5-9f24-6c7c736f7220
Wheeler, Andrew J.
0f243ba3-3aae-470c-ba4a-46a8c4b9197a

Lim, Aaron, Huvenne, Veerle A.I., Vertino, Agostina, Spezzaferri, Silvia and Wheeler, Andrew J. (2018) New insights on coral mound development from groundtruthed high-resolution ROV-mounted multibeam imaging. Marine Geology, 403, 225-237. (doi:10.1016/j.margeo.2018.06.006).

Record type: Article

Abstract

Currents play a vital role in sustaining and developing deep water benthic habitats by mobilising food and nutrients to otherwise relatively barren parts of the seabed. Where sediment supply is significant, it can have a major influence on the development and morphology of these habitats. This study examines a segment of the Belgica Mound Province, NE Atlantic to better constrain the processes affecting a small-sized cold water coral (CWC) mound habitat and conversely, the hydrodynamic influence of CWC mounds on their own morphological development and surroundings. Here, we utilise ROV-mounted multibeam, ROV-video data, and sediment samples to investigate current processes, mound morphology, density and development. Detailed mapping shows that the area may have the highest density of coral mounds recorded so far, with three distinct mound types defined based on size, morphology and the presence and degree of distinct scour features. A residual current of 36–40 cm s−1 is estimated while large scour features suggest low-frequency, high-magnitude events. These 3 mound types are i) smaller mounds with no scour; ii) mounds with scour in one to two distinct directions and; iii) larger mounds with mound encircling scour. The differing mound types likely had a staggered initiation where younger mounds preferentially developed near clusters of pre-existing mounds. Given the high density of these small CWC mounds, we support the hypothesis that over time, this clustering may eventually lead to these mounds coalescing into larger coral mound features.

Full text not available from this repository.

More information

Accepted/In Press date: 15 June 2018
e-pub ahead of print date: 19 June 2018
Published date: 1 September 2018
Keywords: Bedforms, Cold water coral mounds, Currents, Habitat mapping, Sediments

Identifiers

Local EPrints ID: 421875
URI: http://eprints.soton.ac.uk/id/eprint/421875
ISSN: 0025-3227
PURE UUID: 9a541e8a-075b-4ca1-a0c7-ea714736ab9b
ORCID for Veerle A.I. Huvenne: ORCID iD orcid.org/0000-0001-7135-6360

Catalogue record

Date deposited: 05 Jul 2018 16:30
Last modified: 07 Oct 2020 01:49

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