Assessing the atmospheric oscillations effects on the biology of the bullet tuna (Auxis rochei) and its possible linkage with global warming

Detalhes bibliográficos
Autor(a) principal: Nuñoz Expósito, Pedro
Data de Publicação: 2015
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.1/7958
Resumo: Dissertação de mestrado, Biologia Marinha, Faculdade de Ciências e Tecnologia, Universidade do Algarve; Instituto Español de Oceanografia; 2015
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spelling Assessing the atmospheric oscillations effects on the biology of the bullet tuna (Auxis rochei) and its possible linkage with global warmingBiologia marinhaAuxis rocheiJudeuPescasCiênciaCondições atmosféricasMar MediterrâneoDomínio/Área Científica::Ciências Naturais::Ciências BiológicasDissertação de mestrado, Biologia Marinha, Faculdade de Ciências e Tecnologia, Universidade do Algarve; Instituto Español de Oceanografia; 2015This study aims to explore a possible effect of the atmospheric oscillations on the physical condition and the variability in landings of the bullet tuna (Auxis rochei), as well as to provide further information about the biology of this highly migratory species, which is under an increasing commercial pressure. In order to accomplish to accomplish these objectives a total of 2381 individuals of A. rochei were collected all over the Spanish Mediterranean coast. Each individual was measured, weight, sexed and aged. The fitness condition indexes (Kmean and LeCren) were posteriorly obtained individually after the representation of the length-weight relationships. Additionally, fisheries and atmospheric oscillations data were also obtained. A non-parametric Spearman test (α=0.01) was used to correlate the atmospheric oscillation indexes with both physical condition indexes and annual landings data. Finally, a Mann-Whitney test (α=0.05) was used to test significant differences between the physical condition of males and females for both the pre-spawning and post-spawning individuals. The results obtained reflect that the atmospheric oscillations, indexed by the North Atlantic Oscillation (NAO) and the Arctic Oscillation (AO), associated to a time lag (between six months and one year) between the prevalence of the atmospheric conditions and the biological responses in the individuals. Generally, positive phases of the NAO index (negative AO) enhance the migration towards the Mediterranean Sea (higher Kmean), and positive phases of AO (negative NAO) favor the exit towards the Atlantic Ocean (higher LeCren index). These results are explained by the modification of the predominant winds that could favor the migration, as well the nutrients availability after the spawning period. It was also observed that the condition factor in females is significantly larger than in males, which suggests a higher energetic investment in reproduction carried out by females. Finally, a change in growth for older post-spawning individuals was detected, that suggests a higher reproductive investment by older individuals. Nevertheless, despite these findings, further research in this field is needed, since several aspects of the biology of A. rochei remain unclear.Erzini, KarimSapientiaNuñoz Expósito, Pedro2016-04-08T10:19:08Z2015-11-2720152015-11-27T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10400.1/7958TID:201192268enginfo: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:RCAAP2023-07-24T10:19:09Zoai:sapientia.ualg.pt:10400.1/7958Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:00:12.500672Repositório 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 Assessing the atmospheric oscillations effects on the biology of the bullet tuna (Auxis rochei) and its possible linkage with global warming
title Assessing the atmospheric oscillations effects on the biology of the bullet tuna (Auxis rochei) and its possible linkage with global warming
spellingShingle Assessing the atmospheric oscillations effects on the biology of the bullet tuna (Auxis rochei) and its possible linkage with global warming
Nuñoz Expósito, Pedro
Biologia marinha
Auxis rochei
Judeu
Pescas
Ciência
Condições atmosféricas
Mar Mediterrâneo
Domínio/Área Científica::Ciências Naturais::Ciências Biológicas
title_short Assessing the atmospheric oscillations effects on the biology of the bullet tuna (Auxis rochei) and its possible linkage with global warming
title_full Assessing the atmospheric oscillations effects on the biology of the bullet tuna (Auxis rochei) and its possible linkage with global warming
title_fullStr Assessing the atmospheric oscillations effects on the biology of the bullet tuna (Auxis rochei) and its possible linkage with global warming
title_full_unstemmed Assessing the atmospheric oscillations effects on the biology of the bullet tuna (Auxis rochei) and its possible linkage with global warming
title_sort Assessing the atmospheric oscillations effects on the biology of the bullet tuna (Auxis rochei) and its possible linkage with global warming
author Nuñoz Expósito, Pedro
author_facet Nuñoz Expósito, Pedro
author_role author
dc.contributor.none.fl_str_mv Erzini, Karim
Sapientia
dc.contributor.author.fl_str_mv Nuñoz Expósito, Pedro
dc.subject.por.fl_str_mv Biologia marinha
Auxis rochei
Judeu
Pescas
Ciência
Condições atmosféricas
Mar Mediterrâneo
Domínio/Área Científica::Ciências Naturais::Ciências Biológicas
topic Biologia marinha
Auxis rochei
Judeu
Pescas
Ciência
Condições atmosféricas
Mar Mediterrâneo
Domínio/Área Científica::Ciências Naturais::Ciências Biológicas
description Dissertação de mestrado, Biologia Marinha, Faculdade de Ciências e Tecnologia, Universidade do Algarve; Instituto Español de Oceanografia; 2015
publishDate 2015
dc.date.none.fl_str_mv 2015-11-27
2015
2015-11-27T00:00:00Z
2016-04-08T10:19:08Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.1/7958
TID:201192268
url http://hdl.handle.net/10400.1/7958
identifier_str_mv TID:201192268
dc.language.iso.fl_str_mv eng
language eng
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.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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