Demography of a deep-sea lantern shark (Etmopterus spinax) caught in trawl fisheries of the northeastern Atlantic: Application of Leslie matrices with incorporated uncertainties

Detalhes bibliográficos
Autor(a) principal: Coelho, R.
Data de Publicação: 2015
Outros Autores: Alpizar-Jara, R., Erzini, K.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10174/17205
https://doi.org/10.1016/j.dsr2.2014.01.012
Resumo: The deep-sea lantern shark Etmopterus spinax occurs in the northeast Atlantic on or near the bottoms of the outer continental shelves and slopes, and is regularly captured as bycatch in deep-water commercial fisheries. Given the lack of knowledge on the impacts of fisheries on this species, a demographic analysis using age-based Leslie matrices was carried out. Given the uncertainties in the mortality estimates and in the available life history parameters, several different scenarios, some incorporating stochasticity in the life history parameters (using Monte Carlo simulation), were analyzed. If only natural mortality were considered, even af ter introducing uncertainties in all parameters, the estimated population growth rate ( λ) suggested an increasing population. However, iffishing mortality from trawlfi sheries is considered, the estimates of λ either indicated increasing or declining populations. In these latter cases, the uncertainties in the species reproductive cycle seemed to be particularly relevant, as a 2-year reproductive cycle indicated a stable population, while a longer (3-year cycle) indicated a declining population. The estimated matrix elasticities were in general higher for the survivorship parameters of the younger age classes and tended to decrease for the older ages. This highlights the susceptibility of this deep-sea squaloid to increasingfi shing mortality, emphasizing that even though this is a small-sized species, it shows population dynamics patterns more typical of the larger-sized and in general more vulnerable species.
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spelling Demography of a deep-sea lantern shark (Etmopterus spinax) caught in trawl fisheries of the northeastern Atlantic: Application of Leslie matrices with incorporated uncertaintiesBottom trawlingDeep sea sharksDeep sea fisheriesDemographic analysisFishing mortalityPopulation dynamicsThe deep-sea lantern shark Etmopterus spinax occurs in the northeast Atlantic on or near the bottoms of the outer continental shelves and slopes, and is regularly captured as bycatch in deep-water commercial fisheries. Given the lack of knowledge on the impacts of fisheries on this species, a demographic analysis using age-based Leslie matrices was carried out. Given the uncertainties in the mortality estimates and in the available life history parameters, several different scenarios, some incorporating stochasticity in the life history parameters (using Monte Carlo simulation), were analyzed. If only natural mortality were considered, even af ter introducing uncertainties in all parameters, the estimated population growth rate ( λ) suggested an increasing population. However, iffishing mortality from trawlfi sheries is considered, the estimates of λ either indicated increasing or declining populations. In these latter cases, the uncertainties in the species reproductive cycle seemed to be particularly relevant, as a 2-year reproductive cycle indicated a stable population, while a longer (3-year cycle) indicated a declining population. The estimated matrix elasticities were in general higher for the survivorship parameters of the younger age classes and tended to decrease for the older ages. This highlights the susceptibility of this deep-sea squaloid to increasingfi shing mortality, emphasizing that even though this is a small-sized species, it shows population dynamics patterns more typical of the larger-sized and in general more vulnerable species.Elsevier2016-02-02T11:30:55Z2016-02-022015-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10174/17205http://hdl.handle.net/10174/17205https://doi.org/10.1016/j.dsr2.2014.01.012engCoelho, R.; Alpizar-Jara, R. & Erzini, K. (2015). Demography of a deep-sea lantern shark (Etmopterus spinax) caught in trawl fisheries of the northeastern Atlantic: Application of Leslie matrices with incorporated uncertainties. Deep-Sea Research Part II: Topical Studies in Oceanography. Volume 115, p. 64-72. DOI: 10.1016/j.dsr2.2014.01.012.64-720967-0645http://www.sciencedirect.com/science/article/pii/S0967064514000265http://www.journals.elsevier.com/deep-sea-research-part-ii-topical-studies-in-oceanography115ndalpizar@uevora.ptnd336Coelho, R.Alpizar-Jara, R.Erzini, K.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:RCAAP2024-01-03T19:04:33Zoai:dspace.uevora.pt:10174/17205Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:09:25.633085Repositório 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 Demography of a deep-sea lantern shark (Etmopterus spinax) caught in trawl fisheries of the northeastern Atlantic: Application of Leslie matrices with incorporated uncertainties
title Demography of a deep-sea lantern shark (Etmopterus spinax) caught in trawl fisheries of the northeastern Atlantic: Application of Leslie matrices with incorporated uncertainties
spellingShingle Demography of a deep-sea lantern shark (Etmopterus spinax) caught in trawl fisheries of the northeastern Atlantic: Application of Leslie matrices with incorporated uncertainties
Coelho, R.
Bottom trawling
Deep sea sharks
Deep sea fisheries
Demographic analysis
Fishing mortality
Population dynamics
title_short Demography of a deep-sea lantern shark (Etmopterus spinax) caught in trawl fisheries of the northeastern Atlantic: Application of Leslie matrices with incorporated uncertainties
title_full Demography of a deep-sea lantern shark (Etmopterus spinax) caught in trawl fisheries of the northeastern Atlantic: Application of Leslie matrices with incorporated uncertainties
title_fullStr Demography of a deep-sea lantern shark (Etmopterus spinax) caught in trawl fisheries of the northeastern Atlantic: Application of Leslie matrices with incorporated uncertainties
title_full_unstemmed Demography of a deep-sea lantern shark (Etmopterus spinax) caught in trawl fisheries of the northeastern Atlantic: Application of Leslie matrices with incorporated uncertainties
title_sort Demography of a deep-sea lantern shark (Etmopterus spinax) caught in trawl fisheries of the northeastern Atlantic: Application of Leslie matrices with incorporated uncertainties
author Coelho, R.
author_facet Coelho, R.
Alpizar-Jara, R.
Erzini, K.
author_role author
author2 Alpizar-Jara, R.
Erzini, K.
author2_role author
author
dc.contributor.author.fl_str_mv Coelho, R.
Alpizar-Jara, R.
Erzini, K.
dc.subject.por.fl_str_mv Bottom trawling
Deep sea sharks
Deep sea fisheries
Demographic analysis
Fishing mortality
Population dynamics
topic Bottom trawling
Deep sea sharks
Deep sea fisheries
Demographic analysis
Fishing mortality
Population dynamics
description The deep-sea lantern shark Etmopterus spinax occurs in the northeast Atlantic on or near the bottoms of the outer continental shelves and slopes, and is regularly captured as bycatch in deep-water commercial fisheries. Given the lack of knowledge on the impacts of fisheries on this species, a demographic analysis using age-based Leslie matrices was carried out. Given the uncertainties in the mortality estimates and in the available life history parameters, several different scenarios, some incorporating stochasticity in the life history parameters (using Monte Carlo simulation), were analyzed. If only natural mortality were considered, even af ter introducing uncertainties in all parameters, the estimated population growth rate ( λ) suggested an increasing population. However, iffishing mortality from trawlfi sheries is considered, the estimates of λ either indicated increasing or declining populations. In these latter cases, the uncertainties in the species reproductive cycle seemed to be particularly relevant, as a 2-year reproductive cycle indicated a stable population, while a longer (3-year cycle) indicated a declining population. The estimated matrix elasticities were in general higher for the survivorship parameters of the younger age classes and tended to decrease for the older ages. This highlights the susceptibility of this deep-sea squaloid to increasingfi shing mortality, emphasizing that even though this is a small-sized species, it shows population dynamics patterns more typical of the larger-sized and in general more vulnerable species.
publishDate 2015
dc.date.none.fl_str_mv 2015-01-01T00:00:00Z
2016-02-02T11:30:55Z
2016-02-02
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/10174/17205
http://hdl.handle.net/10174/17205
https://doi.org/10.1016/j.dsr2.2014.01.012
url http://hdl.handle.net/10174/17205
https://doi.org/10.1016/j.dsr2.2014.01.012
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Coelho, R.; Alpizar-Jara, R. & Erzini, K. (2015). Demography of a deep-sea lantern shark (Etmopterus spinax) caught in trawl fisheries of the northeastern Atlantic: Application of Leslie matrices with incorporated uncertainties. Deep-Sea Research Part II: Topical Studies in Oceanography. Volume 115, p. 64-72. DOI: 10.1016/j.dsr2.2014.01.012.
64-72
0967-0645
http://www.sciencedirect.com/science/article/pii/S0967064514000265
http://www.journals.elsevier.com/deep-sea-research-part-ii-topical-studies-in-oceanography
115
nd
alpizar@uevora.pt
nd
336
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
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
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collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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