Are sardine larvae caught off northern Portugal in winter starving? An approach examining nutritional conditions

Detalhes bibliográficos
Autor(a) principal: Chicharo, Maria Alexandra
Data de Publicação: 2003
Outros Autores: Esteves, E., Santos, A. Miguel P., Santos, Antonina dos, Peliz, A., Re, P.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.1/201
Resumo: Recently, winter upwelling events off western Iberia have become more frequent. This may affect the production and survival of sardines egss and larvae through increased offshore transport. By analysis of RNA: DNA ratios, we investigated the impact of winter upwelling events on the larval conditions of Sardina pilchardus larvaeas a function of oceanographic conditions and food availability. Larvae were collected on a research cruise off northern Portugal in February 2000. Environmental parameters such as wind, water temperature, salinity microzooplankton biomass and daily egg production of the calanoid copepod Calanus helgolandicus also measured. The mean RNA:DNA ratios wererelatively high, indicating that almost all larvae collected were good condition. This was in agreement with the high microzooplankton biomass and high daily egg production of the copepod C. helgolandicus recorded during the same period. No adverse effects of upwelling causing offshore transport of larvae into poor feeding areas could be demonstrated because of the presence of a stratified warm plume with consequent high food production.
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spelling Are sardine larvae caught off northern Portugal in winter starving? An approach examining nutritional conditionsPeixeSardinhaHidrobiologia da pescaRNAFish larvaeDaily egg productionRNA:DNA ratiosSardina pilchardusMicrozooplankton biomassRecently, winter upwelling events off western Iberia have become more frequent. This may affect the production and survival of sardines egss and larvae through increased offshore transport. By analysis of RNA: DNA ratios, we investigated the impact of winter upwelling events on the larval conditions of Sardina pilchardus larvaeas a function of oceanographic conditions and food availability. Larvae were collected on a research cruise off northern Portugal in February 2000. Environmental parameters such as wind, water temperature, salinity microzooplankton biomass and daily egg production of the calanoid copepod Calanus helgolandicus also measured. The mean RNA:DNA ratios wererelatively high, indicating that almost all larvae collected were good condition. This was in agreement with the high microzooplankton biomass and high daily egg production of the copepod C. helgolandicus recorded during the same period. No adverse effects of upwelling causing offshore transport of larvae into poor feeding areas could be demonstrated because of the presence of a stratified warm plume with consequent high food production.This research was funded by the project ‘Assessing the Impact of Hydrodynamic Forcing on the Survival of Small Pelagic Fish Early Life Stages of Western Iberia (SURVIVAL)’ (FCT-PRAXIS/P/CTE/11282/1998). SURVIVAL is a project affiliated with GLOBEC. Thanks are due to Marcelo de Vasconcelos, the crew of the RV ‘Noruega’, the PELAGICOS programme (FCT-IPIMAR), and to all persons who provided data or participated in the cruises. We would like to thank Xavier Irigoien for providing assistance with the egg and copepod production techniques.Inter ResearchSapientiaChicharo, Maria AlexandraEsteves, E.Santos, A. Miguel P.Santos, Antonina dosPeliz, A.Re, P.2010-04-21T11:00:25Z20032003-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.1/201engMarine Ecology Progress Series0171-8630AUT: MCH00377; EES01759;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:RCAAP2023-07-24T10:10:55Zoai:sapientia.ualg.pt:10400.1/201Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:54:36.157390Repositório 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 Are sardine larvae caught off northern Portugal in winter starving? An approach examining nutritional conditions
title Are sardine larvae caught off northern Portugal in winter starving? An approach examining nutritional conditions
spellingShingle Are sardine larvae caught off northern Portugal in winter starving? An approach examining nutritional conditions
Chicharo, Maria Alexandra
Peixe
Sardinha
Hidrobiologia da pesca
RNA
Fish larvae
Daily egg production
RNA:DNA ratios
Sardina pilchardus
Microzooplankton biomass
title_short Are sardine larvae caught off northern Portugal in winter starving? An approach examining nutritional conditions
title_full Are sardine larvae caught off northern Portugal in winter starving? An approach examining nutritional conditions
title_fullStr Are sardine larvae caught off northern Portugal in winter starving? An approach examining nutritional conditions
title_full_unstemmed Are sardine larvae caught off northern Portugal in winter starving? An approach examining nutritional conditions
title_sort Are sardine larvae caught off northern Portugal in winter starving? An approach examining nutritional conditions
author Chicharo, Maria Alexandra
author_facet Chicharo, Maria Alexandra
Esteves, E.
Santos, A. Miguel P.
Santos, Antonina dos
Peliz, A.
Re, P.
author_role author
author2 Esteves, E.
Santos, A. Miguel P.
Santos, Antonina dos
Peliz, A.
Re, P.
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Sapientia
dc.contributor.author.fl_str_mv Chicharo, Maria Alexandra
Esteves, E.
Santos, A. Miguel P.
Santos, Antonina dos
Peliz, A.
Re, P.
dc.subject.por.fl_str_mv Peixe
Sardinha
Hidrobiologia da pesca
RNA
Fish larvae
Daily egg production
RNA:DNA ratios
Sardina pilchardus
Microzooplankton biomass
topic Peixe
Sardinha
Hidrobiologia da pesca
RNA
Fish larvae
Daily egg production
RNA:DNA ratios
Sardina pilchardus
Microzooplankton biomass
description Recently, winter upwelling events off western Iberia have become more frequent. This may affect the production and survival of sardines egss and larvae through increased offshore transport. By analysis of RNA: DNA ratios, we investigated the impact of winter upwelling events on the larval conditions of Sardina pilchardus larvaeas a function of oceanographic conditions and food availability. Larvae were collected on a research cruise off northern Portugal in February 2000. Environmental parameters such as wind, water temperature, salinity microzooplankton biomass and daily egg production of the calanoid copepod Calanus helgolandicus also measured. The mean RNA:DNA ratios wererelatively high, indicating that almost all larvae collected were good condition. This was in agreement with the high microzooplankton biomass and high daily egg production of the copepod C. helgolandicus recorded during the same period. No adverse effects of upwelling causing offshore transport of larvae into poor feeding areas could be demonstrated because of the presence of a stratified warm plume with consequent high food production.
publishDate 2003
dc.date.none.fl_str_mv 2003
2003-01-01T00:00:00Z
2010-04-21T11:00:25Z
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/10400.1/201
url http://hdl.handle.net/10400.1/201
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Marine Ecology Progress Series
0171-8630
AUT: MCH00377; EES01759;
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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