Visual evidence of reduced seafloor conditions and indications of a cold-seep ecosystem from the Hatton–Rockall basin (NE Atlantic)

Neat, Francis C.; Jamieson, Alan J.; Stewart, Heather A.; Narayanaswamy, Bhavani E.; Collie, Neil; Stewart, Michael; Linley, Thomas D.. 2019 Visual evidence of reduced seafloor conditions and indications of a cold-seep ecosystem from the Hatton–Rockall basin (NE Atlantic). Journal of the Marine Biological Association of the United Kingdom, 99 (2). 271-277. https://doi.org/10.1017/S0025315418000115

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Abstract/Summary

High definition video from a towed camera system was used to describe the deep-sea benthic habitats within an elongate depression located at the western margin of Rockall Bank in the Hatton–Rockall Basin. At depths greater than 1190 m, an extensive area (10 km long by 1.5 km wide) of what appeared to be reduced sediments, bacterial mats and flocculent matter indicated possible cold-seep habitat. Plumes of sediment-rich fluid were observed alongside raised elongate features that gave topographic relief to the otherwise flat seafloor. In the deepest section of the depression (1215 m) dense flocculent matter was observed suspended in the water column, in places obscuring the seabed. Away from the bacterial mats, the habitat changed rapidly to sediments dominated by tube-dwelling polychaete worms and then to deep-sea sedimentary habitats more typical for the water depth (sponges and burrowing megafauna in areas of gentle slopes, and coral gardens on steeper slopes).

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1017/S0025315418000115
ISSN:	0025-3154
Date made live:	01 Feb 2019 16:22 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/522152

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