On the structure of the neritic suprabenthic communities from the Portuguese continental margin
Autor(a) principal: | |
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Data de Publicação: | 1997 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10773/5048 |
Resumo: | This work presents the investigations made on the neritic suprabenthic communities of the Portuguese margin (continental shelf and upper slope) exposed to seasonal upwelling. These communities were sampled during the AVEIRO-94 cruise at 5 sites located along an E-W bathymetric transect from 21 to 299 m depth using a suprabenthic sled with superposed nets. In the 0 to 100 cm water layer, the total densities ranged from 700.2 to 13591.7 ind. 100m(-2). During daytime, the motile fauna was mainly concentrated within the 0 to 50 cm water layer (76.2 to 97.2% of the total abundance). The night-time sample at the shallower site showed a more even distribution of the fauna in the near-bottom water layers (nocturnal migratory behaviour of some motile species). The Shannon diversity (H') values ranged from 1.84 to 3.54 for the shelf sites and increased at the upper slope site (4.15). Mysids and amphipods were generally dominant except for at the middle part of the shelf where the latter was replaced by euphausiids. The suprabenthic fauna off Aveiro was compared with similar data from the same bathymetric sampling levels off Arcachon (Bay of Biscay). Multivariate analysis showed that differences in faunal composition between the 2 geographic areas were smaller than depth-related variations within geographic areas. The results were discussed in relation to other suprabenthic communities from the northeastern Atlantic. |
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On the structure of the neritic suprabenthic communities from the Portuguese continental marginHyperbenthic mysids crustaceaBoundary-layer macrofaunaWestern english-channelNocturnal pelagic phaseNear-bottomBathymetric distributionVertical zonationSwimming activitySand communityDiel changesSuprabenthosPortuguese continental marginCommunity structureThis work presents the investigations made on the neritic suprabenthic communities of the Portuguese margin (continental shelf and upper slope) exposed to seasonal upwelling. These communities were sampled during the AVEIRO-94 cruise at 5 sites located along an E-W bathymetric transect from 21 to 299 m depth using a suprabenthic sled with superposed nets. In the 0 to 100 cm water layer, the total densities ranged from 700.2 to 13591.7 ind. 100m(-2). During daytime, the motile fauna was mainly concentrated within the 0 to 50 cm water layer (76.2 to 97.2% of the total abundance). The night-time sample at the shallower site showed a more even distribution of the fauna in the near-bottom water layers (nocturnal migratory behaviour of some motile species). The Shannon diversity (H') values ranged from 1.84 to 3.54 for the shelf sites and increased at the upper slope site (4.15). Mysids and amphipods were generally dominant except for at the middle part of the shelf where the latter was replaced by euphausiids. The suprabenthic fauna off Aveiro was compared with similar data from the same bathymetric sampling levels off Arcachon (Bay of Biscay). Multivariate analysis showed that differences in faunal composition between the 2 geographic areas were smaller than depth-related variations within geographic areas. The results were discussed in relation to other suprabenthic communities from the northeastern Atlantic.Inter Research2012-01-11T16:16:24Z1997-01-01T00:00:00Z1997info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/5048eng0171-8630Cunha, M. R.Sorbe, J. C.Bernardes, C.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-22T11:06:49Zoai:ria.ua.pt:10773/5048Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T02:43:01.906670Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
On the structure of the neritic suprabenthic communities from the Portuguese continental margin |
title |
On the structure of the neritic suprabenthic communities from the Portuguese continental margin |
spellingShingle |
On the structure of the neritic suprabenthic communities from the Portuguese continental margin Cunha, M. R. Hyperbenthic mysids crustacea Boundary-layer macrofauna Western english-channel Nocturnal pelagic phase Near-bottom Bathymetric distribution Vertical zonation Swimming activity Sand community Diel changes Suprabenthos Portuguese continental margin Community structure |
title_short |
On the structure of the neritic suprabenthic communities from the Portuguese continental margin |
title_full |
On the structure of the neritic suprabenthic communities from the Portuguese continental margin |
title_fullStr |
On the structure of the neritic suprabenthic communities from the Portuguese continental margin |
title_full_unstemmed |
On the structure of the neritic suprabenthic communities from the Portuguese continental margin |
title_sort |
On the structure of the neritic suprabenthic communities from the Portuguese continental margin |
author |
Cunha, M. R. |
author_facet |
Cunha, M. R. Sorbe, J. C. Bernardes, C. |
author_role |
author |
author2 |
Sorbe, J. C. Bernardes, C. |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Cunha, M. R. Sorbe, J. C. Bernardes, C. |
dc.subject.por.fl_str_mv |
Hyperbenthic mysids crustacea Boundary-layer macrofauna Western english-channel Nocturnal pelagic phase Near-bottom Bathymetric distribution Vertical zonation Swimming activity Sand community Diel changes Suprabenthos Portuguese continental margin Community structure |
topic |
Hyperbenthic mysids crustacea Boundary-layer macrofauna Western english-channel Nocturnal pelagic phase Near-bottom Bathymetric distribution Vertical zonation Swimming activity Sand community Diel changes Suprabenthos Portuguese continental margin Community structure |
description |
This work presents the investigations made on the neritic suprabenthic communities of the Portuguese margin (continental shelf and upper slope) exposed to seasonal upwelling. These communities were sampled during the AVEIRO-94 cruise at 5 sites located along an E-W bathymetric transect from 21 to 299 m depth using a suprabenthic sled with superposed nets. In the 0 to 100 cm water layer, the total densities ranged from 700.2 to 13591.7 ind. 100m(-2). During daytime, the motile fauna was mainly concentrated within the 0 to 50 cm water layer (76.2 to 97.2% of the total abundance). The night-time sample at the shallower site showed a more even distribution of the fauna in the near-bottom water layers (nocturnal migratory behaviour of some motile species). The Shannon diversity (H') values ranged from 1.84 to 3.54 for the shelf sites and increased at the upper slope site (4.15). Mysids and amphipods were generally dominant except for at the middle part of the shelf where the latter was replaced by euphausiids. The suprabenthic fauna off Aveiro was compared with similar data from the same bathymetric sampling levels off Arcachon (Bay of Biscay). Multivariate analysis showed that differences in faunal composition between the 2 geographic areas were smaller than depth-related variations within geographic areas. The results were discussed in relation to other suprabenthic communities from the northeastern Atlantic. |
publishDate |
1997 |
dc.date.none.fl_str_mv |
1997-01-01T00:00:00Z 1997 2012-01-11T16:16:24Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10773/5048 |
url |
http://hdl.handle.net/10773/5048 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0171-8630 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Inter Research |
publisher.none.fl_str_mv |
Inter Research |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799137479082639360 |