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Depth-related distribution and abundance of seastars (Echinodermata: Asteroidea) in the Porcupine Seabight and Porcupine Abyssal Plain, N.E. Atlantic

Depth-related distribution and abundance of seastars (Echinodermata: Asteroidea) in the Porcupine Seabight and Porcupine Abyssal Plain, N.E. Atlantic
Depth-related distribution and abundance of seastars (Echinodermata: Asteroidea) in the Porcupine Seabight and Porcupine Abyssal Plain, N.E. Atlantic
The depth-related distribution of seastar (Echinodermata: Asteroidea) species between 150 and 4950 m in the Porcupine Seabight and Porcupine Abyssal Plain is described. 47 species of asteroid were identified from ~14,000 individuals collected. The bathymetric range of each species is recorded. What are considered quantitative data, from an acoustically monitored epibenthic sledge and supplementary data from otter trawls, are used to display the relative abundance of individuals within their bathymetric range. Asteroid species are found to have very narrow centres of distribution in which they are abundant, despite much wider total adult depth ranges. Centres of distribution may be skewed. This might result from competition for resources or be related to the occurrence of favourable habitats at particular depths. The bathymetric distributions of the juveniles of some species extend outside the adult depth ranges. There is a distinct pattern of zonation with two major regions of faunal change and six distinct zones. An upper slope zone ranges from 150 to ~700 m depth, an upper bathyal zone between 700 and 1100 m, a mid-bathyal zone from 1100 to1700 m and a lower bathyal zone between 1700 and 2500 m. Below 2500 m the lower continental slope and continental rise have a characteristic asteroid fauna. The abyssal zone starts at about 2800 m. Regions of major faunal change are identified at the boundaries of both upper and mid-bathyal zones and at the transition of bathyal to abyssal fauna. Diversity is greatest at ~1800 m, decreasing with depth to ~2600 m before increasing again to high levels at ~4700 m.
asteroidea, ecological zonation, vertical distribution, abyssal plain, continental slope, n.e. atlantic
0967-0637
1901-1920
Howell, Kerry L.
ed24ce04-6261-4350-b55a-e8c7bdfc7dc2
Billett, David S.M.
aab439e2-c839-4cd2-815c-3d401e0468db
Tyler, Paul A.
d1965388-38cc-4c1d-9217-d59dba4dd7f8
Howell, Kerry L.
ed24ce04-6261-4350-b55a-e8c7bdfc7dc2
Billett, David S.M.
aab439e2-c839-4cd2-815c-3d401e0468db
Tyler, Paul A.
d1965388-38cc-4c1d-9217-d59dba4dd7f8

Howell, Kerry L., Billett, David S.M. and Tyler, Paul A. (2002) Depth-related distribution and abundance of seastars (Echinodermata: Asteroidea) in the Porcupine Seabight and Porcupine Abyssal Plain, N.E. Atlantic. Deep Sea Research Part I: Oceanographic Research Papers, 49 (10), 1901-1920. (doi:10.1016/S0967-0637(02)00090-0).

Record type: Article

Abstract

The depth-related distribution of seastar (Echinodermata: Asteroidea) species between 150 and 4950 m in the Porcupine Seabight and Porcupine Abyssal Plain is described. 47 species of asteroid were identified from ~14,000 individuals collected. The bathymetric range of each species is recorded. What are considered quantitative data, from an acoustically monitored epibenthic sledge and supplementary data from otter trawls, are used to display the relative abundance of individuals within their bathymetric range. Asteroid species are found to have very narrow centres of distribution in which they are abundant, despite much wider total adult depth ranges. Centres of distribution may be skewed. This might result from competition for resources or be related to the occurrence of favourable habitats at particular depths. The bathymetric distributions of the juveniles of some species extend outside the adult depth ranges. There is a distinct pattern of zonation with two major regions of faunal change and six distinct zones. An upper slope zone ranges from 150 to ~700 m depth, an upper bathyal zone between 700 and 1100 m, a mid-bathyal zone from 1100 to1700 m and a lower bathyal zone between 1700 and 2500 m. Below 2500 m the lower continental slope and continental rise have a characteristic asteroid fauna. The abyssal zone starts at about 2800 m. Regions of major faunal change are identified at the boundaries of both upper and mid-bathyal zones and at the transition of bathyal to abyssal fauna. Diversity is greatest at ~1800 m, decreasing with depth to ~2600 m before increasing again to high levels at ~4700 m.

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More information

Published date: October 2002
Keywords: asteroidea, ecological zonation, vertical distribution, abyssal plain, continental slope, n.e. atlantic

Identifiers

Local EPrints ID: 5973
URI: http://eprints.soton.ac.uk/id/eprint/5973
ISSN: 0967-0637
PURE UUID: 5d28d599-df62-4d6f-95c9-5a0f60846c49

Catalogue record

Date deposited: 07 Jun 2004
Last modified: 09 Nov 2021 06:06

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Contributors

Author: Kerry L. Howell
Author: David S.M. Billett
Author: Paul A. Tyler

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