First records of dense aggregations of suspension-feeder brittle-stars in Northwest Africa: Could they be directly linked to upwelling phenomena?
Echinoderms are one of the main benthic invertebrate groups, especially in deep waters. Particularly, ophiuroids constitute a common component of megabenthic communities, widely distributed worldwide, from intertidal zone to hadal depths. Within this group, dense aggregations of different species, m...
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ftieo:oai:repositorio.ieo.es:10508/9796 2023-05-15T16:18:27+02:00 First records of dense aggregations of suspension-feeder brittle-stars in Northwest Africa: Could they be directly linked to upwelling phenomena? Calero, B. (Belén) Ramil, F. (Francisco) Ramos, A. (Ana) Atlantic Ocean Central Atlantic Eastern Central Atlantic Sahara waters http://hdl.handle.net/10508/9796 eng eng Centro Oceanográfico de Vigo EcoAfrik http://hdl.handle.net/10508/9796 14th Deep-Sea Biology Symposium. (31/08/2015 - 04/09/2015. Aveiro (Portugal)). today. conferenceObject. En: , . Attribution-NonCommercial-NoDerivs 3.0 Spain http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess CC-BY-NC-ND Biodiversity Brittle-stars suspension-feeders aggregations First record Northwest Africa conferenceObject ftieo 2022-07-26T23:48:49Z Echinoderms are one of the main benthic invertebrate groups, especially in deep waters. Particularly, ophiuroids constitute a common component of megabenthic communities, widely distributed worldwide, from intertidal zone to hadal depths. Within this group, dense aggregations of different species, mostly belonging to suspension-feeder families such as Ophiothrichidae, Ophiactidae, Amphiuridae, Ophiocomidae and Ophiacanthidae, were described worldwide, both in shallow and deep waters and over different sea-bottom types. These aggregations were related with their social behavior, but also with favorable environmental conditions and sometimes were described associated with other suspension-feeders like deep-waters corals. During ten Spanish and Norwegian surveys carried out in Northwest Africa between 2002 and 2012 on board of R/V Vizconde de Eza and R/V Dr. Fridtjof Nansen, an intensive sampling program focused on the study of benthic communities was accomplished in the framework of EcoAfrik and FAO EAF-Nansen projects. In this work, we described, for first time in this area, the existence of ophiuroid sea-beds, mainly concentrated along the Saharan and Mauritanian slope The most impressive sea-beds, estimated in more than 3,700,000 individuals of Ophiacantha abyssicola by km2, was recorded off Western Sahara between 410 and 520 m depth on muddy-bottoms. In addition, dense aggregations of Ophiotrix maculata were described for first time for this species at 410 m in the Saharan slope on living Lophelia pertusa, and also between 197-240 m depth on rocky bottom in the seamount off Mauritania. The particular oceanographic conditions in the Saharan-Mauritanian coast linked to the permanence of the upwelling conditions throughout the year, probably enhance the development of suspension-feeders communities and also of these ophiuroids sea-beds. Conference Object Fridtjof Nansen Lophelia pertusa Instituto Español de Oceanografía: e-IEO Fridtjof ENVELOPE(-56.717,-56.717,-63.567,-63.567) |
institution |
Open Polar |
collection |
Instituto Español de Oceanografía: e-IEO |
op_collection_id |
ftieo |
language |
English |
topic |
Biodiversity Brittle-stars suspension-feeders aggregations First record Northwest Africa |
spellingShingle |
Biodiversity Brittle-stars suspension-feeders aggregations First record Northwest Africa Calero, B. (Belén) First records of dense aggregations of suspension-feeder brittle-stars in Northwest Africa: Could they be directly linked to upwelling phenomena? |
topic_facet |
Biodiversity Brittle-stars suspension-feeders aggregations First record Northwest Africa |
description |
Echinoderms are one of the main benthic invertebrate groups, especially in deep waters. Particularly, ophiuroids constitute a common component of megabenthic communities, widely distributed worldwide, from intertidal zone to hadal depths. Within this group, dense aggregations of different species, mostly belonging to suspension-feeder families such as Ophiothrichidae, Ophiactidae, Amphiuridae, Ophiocomidae and Ophiacanthidae, were described worldwide, both in shallow and deep waters and over different sea-bottom types. These aggregations were related with their social behavior, but also with favorable environmental conditions and sometimes were described associated with other suspension-feeders like deep-waters corals. During ten Spanish and Norwegian surveys carried out in Northwest Africa between 2002 and 2012 on board of R/V Vizconde de Eza and R/V Dr. Fridtjof Nansen, an intensive sampling program focused on the study of benthic communities was accomplished in the framework of EcoAfrik and FAO EAF-Nansen projects. In this work, we described, for first time in this area, the existence of ophiuroid sea-beds, mainly concentrated along the Saharan and Mauritanian slope The most impressive sea-beds, estimated in more than 3,700,000 individuals of Ophiacantha abyssicola by km2, was recorded off Western Sahara between 410 and 520 m depth on muddy-bottoms. In addition, dense aggregations of Ophiotrix maculata were described for first time for this species at 410 m in the Saharan slope on living Lophelia pertusa, and also between 197-240 m depth on rocky bottom in the seamount off Mauritania. The particular oceanographic conditions in the Saharan-Mauritanian coast linked to the permanence of the upwelling conditions throughout the year, probably enhance the development of suspension-feeders communities and also of these ophiuroids sea-beds. |
author2 |
Ramil, F. (Francisco) Ramos, A. (Ana) |
format |
Conference Object |
author |
Calero, B. (Belén) |
author_facet |
Calero, B. (Belén) |
author_sort |
Calero, B. (Belén) |
title |
First records of dense aggregations of suspension-feeder brittle-stars in Northwest Africa: Could they be directly linked to upwelling phenomena? |
title_short |
First records of dense aggregations of suspension-feeder brittle-stars in Northwest Africa: Could they be directly linked to upwelling phenomena? |
title_full |
First records of dense aggregations of suspension-feeder brittle-stars in Northwest Africa: Could they be directly linked to upwelling phenomena? |
title_fullStr |
First records of dense aggregations of suspension-feeder brittle-stars in Northwest Africa: Could they be directly linked to upwelling phenomena? |
title_full_unstemmed |
First records of dense aggregations of suspension-feeder brittle-stars in Northwest Africa: Could they be directly linked to upwelling phenomena? |
title_sort |
first records of dense aggregations of suspension-feeder brittle-stars in northwest africa: could they be directly linked to upwelling phenomena? |
publisher |
Centro Oceanográfico de Vigo |
url |
http://hdl.handle.net/10508/9796 |
op_coverage |
Atlantic Ocean Central Atlantic Eastern Central Atlantic Sahara waters |
long_lat |
ENVELOPE(-56.717,-56.717,-63.567,-63.567) |
geographic |
Fridtjof |
geographic_facet |
Fridtjof |
genre |
Fridtjof Nansen Lophelia pertusa |
genre_facet |
Fridtjof Nansen Lophelia pertusa |
op_relation |
EcoAfrik http://hdl.handle.net/10508/9796 14th Deep-Sea Biology Symposium. (31/08/2015 - 04/09/2015. Aveiro (Portugal)). today. conferenceObject. En: , . |
op_rights |
Attribution-NonCommercial-NoDerivs 3.0 Spain http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess |
op_rightsnorm |
CC-BY-NC-ND |
_version_ |
1766004627502792704 |