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

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

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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.

Item Type: Publication - Article
Digital Object Identifier (DOI):
ISSN: 09670645
Additional Keywords: Acorn worms; Hemichordates; Tergivelum cinnabarinum; Yoda purpurata; Allapasus isidis; Benthic; Remotely operated vehicle; Mid-Atlantic Ridge; Photograph
Date made live: 08 Jan 2014 13:57 +0 (UTC)

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