Incidental catch of dolphins in trawling fisheries off Patagonia, Argentina: can populations persist?

Autores
Dans, Silvana Laura; Koen Alonso, Mariano; Pedraza, Susana Noemi; Crespo, Enrique Alberto
Año de publicación
2003
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The incidental mortality of dusky dolphins (Lagenorhynchus obscurus) in the Patagonian trawling fishery is a well‐known problem, especially in mid‐water trawl fisheries for shrimp and anchovy. Therefore, it is necessary to determine if recent levels of dolphin bycatch are compatible with the persistence of the dusky dolphin population. This was assessed by comparing annual bycatch rates with a sequence of critical values. These values were based on the maximum rate of increase (rmax) = λ − 1, where λ is the finite rate of increase. The finite rate of increase was estimated from a Leslie matrix where Monte Carlo procedures were employed to incorporate parameter uncertainties (age at first reproduction, survival rates, and fertility). Model life tables were used for survival, and reproductive parameters were estimated from available data on calving interval and age at sexual maturity. Uncertainties associated with annual bycatch rates were also included in the analysis through another randomization procedure that incorporated the variability in dolphin catch per unit effort, nominal fishing effort, and population size. This modeling approach rendered frequency distributions for the parameters of interest. Considering the critical values for incidental mortality rate as (1/2)R = (1/2)rmax and (1/4)R = (1/4)rmax, and a 2‐yr calving interval scenario, the probability that recent dolphin bycatch rates exceed the maximum annual removal rates were higher than 0.3. These results suggest that incidental mortality due to fishing could be, or may become, a threat for the dusky dolphin population off Patagonia. Therefore, a more accurate and intense monitoring program is needed to avoid the decline of this population. Also, this issue should be included in the fishery management strategies to be implemented in the near future.
Fil: Dans, Silvana Laura. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: Koen Alonso, Mariano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: Pedraza, Susana Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina
Fil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina
Materia
ATLANTIC OCEAN
SOUTH
BYCATCH
DUSKY DOLPHINS
LAGENORHYNCHUS OBSCURUS
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/103655
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Incidental catch of dolphins in trawling fisheries off Patagonia, Argentina: can populations persist?Dans, Silvana LauraKoen Alonso, MarianoPedraza, Susana NoemiCrespo, Enrique AlbertoATLANTIC OCEANSOUTHBYCATCHDUSKY DOLPHINSLAGENORHYNCHUS OBSCURUShttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1The incidental mortality of dusky dolphins (Lagenorhynchus obscurus) in the Patagonian trawling fishery is a well‐known problem, especially in mid‐water trawl fisheries for shrimp and anchovy. Therefore, it is necessary to determine if recent levels of dolphin bycatch are compatible with the persistence of the dusky dolphin population. This was assessed by comparing annual bycatch rates with a sequence of critical values. These values were based on the maximum rate of increase (rmax) = λ − 1, where λ is the finite rate of increase. The finite rate of increase was estimated from a Leslie matrix where Monte Carlo procedures were employed to incorporate parameter uncertainties (age at first reproduction, survival rates, and fertility). Model life tables were used for survival, and reproductive parameters were estimated from available data on calving interval and age at sexual maturity. Uncertainties associated with annual bycatch rates were also included in the analysis through another randomization procedure that incorporated the variability in dolphin catch per unit effort, nominal fishing effort, and population size. This modeling approach rendered frequency distributions for the parameters of interest. Considering the critical values for incidental mortality rate as (1/2)R = (1/2)rmax and (1/4)R = (1/4)rmax, and a 2‐yr calving interval scenario, the probability that recent dolphin bycatch rates exceed the maximum annual removal rates were higher than 0.3. These results suggest that incidental mortality due to fishing could be, or may become, a threat for the dusky dolphin population off Patagonia. Therefore, a more accurate and intense monitoring program is needed to avoid the decline of this population. Also, this issue should be included in the fishery management strategies to be implemented in the near future.Fil: Dans, Silvana Laura. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; ArgentinaFil: Koen Alonso, Mariano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; ArgentinaFil: Pedraza, Susana Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; ArgentinaFil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; ArgentinaEcological Society of America2003-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/103655Dans, Silvana Laura; Koen Alonso, Mariano; Pedraza, Susana Noemi; Crespo, Enrique Alberto; Incidental catch of dolphins in trawling fisheries off Patagonia, Argentina: can populations persist?; Ecological Society of America; Ecological Applications; 13; 3; 6-2003; 754-7621051-07611939-5582CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1890/1051-0761(2003)013[0754:ICODIT]2.0.CO;2info:eu-repo/semantics/altIdentifier/url/https://esajournals.onlinelibrary.wiley.com/doi/abs/10.1890/1051-0761%282003%29013%5B0754%3AICODIT%5D2.0.CO%3B2info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:16:37Zoai:ri.conicet.gov.ar:11336/103655instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-10 13:16:37.708CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Incidental catch of dolphins in trawling fisheries off Patagonia, Argentina: can populations persist?
title Incidental catch of dolphins in trawling fisheries off Patagonia, Argentina: can populations persist?
spellingShingle Incidental catch of dolphins in trawling fisheries off Patagonia, Argentina: can populations persist?
Dans, Silvana Laura
ATLANTIC OCEAN
SOUTH
BYCATCH
DUSKY DOLPHINS
LAGENORHYNCHUS OBSCURUS
title_short Incidental catch of dolphins in trawling fisheries off Patagonia, Argentina: can populations persist?
title_full Incidental catch of dolphins in trawling fisheries off Patagonia, Argentina: can populations persist?
title_fullStr Incidental catch of dolphins in trawling fisheries off Patagonia, Argentina: can populations persist?
title_full_unstemmed Incidental catch of dolphins in trawling fisheries off Patagonia, Argentina: can populations persist?
title_sort Incidental catch of dolphins in trawling fisheries off Patagonia, Argentina: can populations persist?
dc.creator.none.fl_str_mv Dans, Silvana Laura
Koen Alonso, Mariano
Pedraza, Susana Noemi
Crespo, Enrique Alberto
author Dans, Silvana Laura
author_facet Dans, Silvana Laura
Koen Alonso, Mariano
Pedraza, Susana Noemi
Crespo, Enrique Alberto
author_role author
author2 Koen Alonso, Mariano
Pedraza, Susana Noemi
Crespo, Enrique Alberto
author2_role author
author
author
dc.subject.none.fl_str_mv ATLANTIC OCEAN
SOUTH
BYCATCH
DUSKY DOLPHINS
LAGENORHYNCHUS OBSCURUS
topic ATLANTIC OCEAN
SOUTH
BYCATCH
DUSKY DOLPHINS
LAGENORHYNCHUS OBSCURUS
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The incidental mortality of dusky dolphins (Lagenorhynchus obscurus) in the Patagonian trawling fishery is a well‐known problem, especially in mid‐water trawl fisheries for shrimp and anchovy. Therefore, it is necessary to determine if recent levels of dolphin bycatch are compatible with the persistence of the dusky dolphin population. This was assessed by comparing annual bycatch rates with a sequence of critical values. These values were based on the maximum rate of increase (rmax) = λ − 1, where λ is the finite rate of increase. The finite rate of increase was estimated from a Leslie matrix where Monte Carlo procedures were employed to incorporate parameter uncertainties (age at first reproduction, survival rates, and fertility). Model life tables were used for survival, and reproductive parameters were estimated from available data on calving interval and age at sexual maturity. Uncertainties associated with annual bycatch rates were also included in the analysis through another randomization procedure that incorporated the variability in dolphin catch per unit effort, nominal fishing effort, and population size. This modeling approach rendered frequency distributions for the parameters of interest. Considering the critical values for incidental mortality rate as (1/2)R = (1/2)rmax and (1/4)R = (1/4)rmax, and a 2‐yr calving interval scenario, the probability that recent dolphin bycatch rates exceed the maximum annual removal rates were higher than 0.3. These results suggest that incidental mortality due to fishing could be, or may become, a threat for the dusky dolphin population off Patagonia. Therefore, a more accurate and intense monitoring program is needed to avoid the decline of this population. Also, this issue should be included in the fishery management strategies to be implemented in the near future.
Fil: Dans, Silvana Laura. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: Koen Alonso, Mariano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: Pedraza, Susana Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina
Fil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina
description The incidental mortality of dusky dolphins (Lagenorhynchus obscurus) in the Patagonian trawling fishery is a well‐known problem, especially in mid‐water trawl fisheries for shrimp and anchovy. Therefore, it is necessary to determine if recent levels of dolphin bycatch are compatible with the persistence of the dusky dolphin population. This was assessed by comparing annual bycatch rates with a sequence of critical values. These values were based on the maximum rate of increase (rmax) = λ − 1, where λ is the finite rate of increase. The finite rate of increase was estimated from a Leslie matrix where Monte Carlo procedures were employed to incorporate parameter uncertainties (age at first reproduction, survival rates, and fertility). Model life tables were used for survival, and reproductive parameters were estimated from available data on calving interval and age at sexual maturity. Uncertainties associated with annual bycatch rates were also included in the analysis through another randomization procedure that incorporated the variability in dolphin catch per unit effort, nominal fishing effort, and population size. This modeling approach rendered frequency distributions for the parameters of interest. Considering the critical values for incidental mortality rate as (1/2)R = (1/2)rmax and (1/4)R = (1/4)rmax, and a 2‐yr calving interval scenario, the probability that recent dolphin bycatch rates exceed the maximum annual removal rates were higher than 0.3. These results suggest that incidental mortality due to fishing could be, or may become, a threat for the dusky dolphin population off Patagonia. Therefore, a more accurate and intense monitoring program is needed to avoid the decline of this population. Also, this issue should be included in the fishery management strategies to be implemented in the near future.
publishDate 2003
dc.date.none.fl_str_mv 2003-06
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/103655
Dans, Silvana Laura; Koen Alonso, Mariano; Pedraza, Susana Noemi; Crespo, Enrique Alberto; Incidental catch of dolphins in trawling fisheries off Patagonia, Argentina: can populations persist?; Ecological Society of America; Ecological Applications; 13; 3; 6-2003; 754-762
1051-0761
1939-5582
CONICET Digital
CONICET
url http://hdl.handle.net/11336/103655
identifier_str_mv Dans, Silvana Laura; Koen Alonso, Mariano; Pedraza, Susana Noemi; Crespo, Enrique Alberto; Incidental catch of dolphins in trawling fisheries off Patagonia, Argentina: can populations persist?; Ecological Society of America; Ecological Applications; 13; 3; 6-2003; 754-762
1051-0761
1939-5582
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1890/1051-0761(2003)013[0754:ICODIT]2.0.CO;2
info:eu-repo/semantics/altIdentifier/url/https://esajournals.onlinelibrary.wiley.com/doi/abs/10.1890/1051-0761%282003%29013%5B0754%3AICODIT%5D2.0.CO%3B2
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Ecological Society of America
publisher.none.fl_str_mv Ecological Society of America
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 12.993085

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