Habitat use, seasonality and demography of an apex predator: Sevengill shark Notorynchus cepedianus in Northern Patagonia

Autores
Irigoyen, Alejo Joaquin; de Wysiecki, Agustín María; Trobbiani, Gastón Andres; Bovcon, Nelson Darío; Awruch, Cynthia Andrea; Argemi, Federico; Jaureguizar, Andrés Javier
Año de publicación
2018
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Gaining insight on how species relate to their environment and other members of the trophic community is critical for their management. We investigated habitat use, seasonal patterns of abundance and population structure of the broadnose sevengill shark Notorynchus cepedianus in the marine temperate environment of a Northern Patagonian bay (Argentina). We expected N. cepedianus to exhibit strong seasonality in the bay driven by the seasonal occurrence of important marine mammal prey. However, an alternative or complementary hypothesis arose from the possibility that N. cepedianus uses the area seasonally as mating grounds. To explore these hypotheses, a suite of baited remote underwater video stations and catch per unit effort data indices were used to estimate the seasonal relative abundance of the species inside the bay. Reproductive hormone levels were measured to determine reproductive status and maturity stages of the population. Results indicated that N. cepedianus uses the bay year-round, showing a peak abundance during spring when individuals aggregate, likely for feeding and mating purposes. Male and female total lengths at maturity were 170 and 190 cm, respectively. Contrary to other studies in the Southwest Atlantic, population composition remained similar throughout the seasons, with adults dominating over juveniles, and adult females prevailing in the population at all times. Considering the historical abundance decline recently reported for the species, protection and enforcement within protected areas across the Southwest Atlantic must remain of high priority in government initiatives.
Fil: Irigoyen, Alejo Joaquin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
Fil: de Wysiecki, Agustín María. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
Fil: Trobbiani, Gastón Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
Fil: Bovcon, Nelson Darío. Provincia del Chubut. Secretaría de Pesca; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Awruch, Cynthia Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina. University of Tasmania; Australia
Fil: Argemi, Federico. Fundación Temaiken; Argentina
Fil: Jaureguizar, Andrés Javier. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas; Argentina. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Materia
BAITED REMOTE UNDERWATER VIDEO STATION
BRUVS
CALETA VALDÉS
CATCH PER UNIT EFFORT
CPUE
REPRODUCTIVE HORMONES
SEASONAL OCCURRENCE
SOUTHWEST ATLANTIC
Nivel de accesibilidad
acceso embargado
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:11336/88337
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/88337
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Habitat use, seasonality and demography of an apex predator: Sevengill shark Notorynchus cepedianus in Northern PatagoniaIrigoyen, Alejo Joaquinde Wysiecki, Agustín MaríaTrobbiani, Gastón AndresBovcon, Nelson DaríoAwruch, Cynthia AndreaArgemi, FedericoJaureguizar, Andrés JavierBAITED REMOTE UNDERWATER VIDEO STATIONBRUVSCALETA VALDÉSCATCH PER UNIT EFFORTCPUEREPRODUCTIVE HORMONESSEASONAL OCCURRENCESOUTHWEST ATLANTIChttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Gaining insight on how species relate to their environment and other members of the trophic community is critical for their management. We investigated habitat use, seasonal patterns of abundance and population structure of the broadnose sevengill shark Notorynchus cepedianus in the marine temperate environment of a Northern Patagonian bay (Argentina). We expected N. cepedianus to exhibit strong seasonality in the bay driven by the seasonal occurrence of important marine mammal prey. However, an alternative or complementary hypothesis arose from the possibility that N. cepedianus uses the area seasonally as mating grounds. To explore these hypotheses, a suite of baited remote underwater video stations and catch per unit effort data indices were used to estimate the seasonal relative abundance of the species inside the bay. Reproductive hormone levels were measured to determine reproductive status and maturity stages of the population. Results indicated that N. cepedianus uses the bay year-round, showing a peak abundance during spring when individuals aggregate, likely for feeding and mating purposes. Male and female total lengths at maturity were 170 and 190 cm, respectively. Contrary to other studies in the Southwest Atlantic, population composition remained similar throughout the seasons, with adults dominating over juveniles, and adult females prevailing in the population at all times. Considering the historical abundance decline recently reported for the species, protection and enforcement within protected areas across the Southwest Atlantic must remain of high priority in government initiatives.Fil: Irigoyen, Alejo Joaquin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; ArgentinaFil: de Wysiecki, Agustín María. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; ArgentinaFil: Trobbiani, Gastón Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; ArgentinaFil: Bovcon, Nelson Darío. Provincia del Chubut. Secretaría de Pesca; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Awruch, Cynthia Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina. University of Tasmania; AustraliaFil: Argemi, Federico. Fundación Temaiken; ArgentinaFil: Jaureguizar, Andrés Javier. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas; Argentina. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaInter-Research2018-09info:eu-repo/date/embargoEnd/2023-11-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/88337Irigoyen, Alejo Joaquin; de Wysiecki, Agustín María; Trobbiani, Gastón Andres; Bovcon, Nelson Darío; Awruch, Cynthia Andrea; et al.; Habitat use, seasonality and demography of an apex predator: Sevengill shark Notorynchus cepedianus in Northern Patagonia; Inter-Research; Marine Ecology Progress Series; 603; 9-2018; 147-1600171-8630CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.3354/meps12715info:eu-repo/semantics/altIdentifier/url/https://www.int-res.com/abstracts/meps/v603/p147-160/info:eu-repo/semantics/embargoedAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:11:46Zoai:ri.conicet.gov.ar:11336/88337instacron: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 13:11:46.589CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Habitat use, seasonality and demography of an apex predator: Sevengill shark Notorynchus cepedianus in Northern Patagonia
title Habitat use, seasonality and demography of an apex predator: Sevengill shark Notorynchus cepedianus in Northern Patagonia
spellingShingle Habitat use, seasonality and demography of an apex predator: Sevengill shark Notorynchus cepedianus in Northern Patagonia
Irigoyen, Alejo Joaquin
BAITED REMOTE UNDERWATER VIDEO STATION
BRUVS
CALETA VALDÉS
CATCH PER UNIT EFFORT
CPUE
REPRODUCTIVE HORMONES
SEASONAL OCCURRENCE
SOUTHWEST ATLANTIC
title_short Habitat use, seasonality and demography of an apex predator: Sevengill shark Notorynchus cepedianus in Northern Patagonia
title_full Habitat use, seasonality and demography of an apex predator: Sevengill shark Notorynchus cepedianus in Northern Patagonia
title_fullStr Habitat use, seasonality and demography of an apex predator: Sevengill shark Notorynchus cepedianus in Northern Patagonia
title_full_unstemmed Habitat use, seasonality and demography of an apex predator: Sevengill shark Notorynchus cepedianus in Northern Patagonia
title_sort Habitat use, seasonality and demography of an apex predator: Sevengill shark Notorynchus cepedianus in Northern Patagonia
dc.creator.none.fl_str_mv Irigoyen, Alejo Joaquin
de Wysiecki, Agustín María
Trobbiani, Gastón Andres
Bovcon, Nelson Darío
Awruch, Cynthia Andrea
Argemi, Federico
Jaureguizar, Andrés Javier
author Irigoyen, Alejo Joaquin
author_facet Irigoyen, Alejo Joaquin
de Wysiecki, Agustín María
Trobbiani, Gastón Andres
Bovcon, Nelson Darío
Awruch, Cynthia Andrea
Argemi, Federico
Jaureguizar, Andrés Javier
author_role author
author2 de Wysiecki, Agustín María
Trobbiani, Gastón Andres
Bovcon, Nelson Darío
Awruch, Cynthia Andrea
Argemi, Federico
Jaureguizar, Andrés Javier
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv BAITED REMOTE UNDERWATER VIDEO STATION
BRUVS
CALETA VALDÉS
CATCH PER UNIT EFFORT
CPUE
REPRODUCTIVE HORMONES
SEASONAL OCCURRENCE
SOUTHWEST ATLANTIC
topic BAITED REMOTE UNDERWATER VIDEO STATION
BRUVS
CALETA VALDÉS
CATCH PER UNIT EFFORT
CPUE
REPRODUCTIVE HORMONES
SEASONAL OCCURRENCE
SOUTHWEST ATLANTIC
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Gaining insight on how species relate to their environment and other members of the trophic community is critical for their management. We investigated habitat use, seasonal patterns of abundance and population structure of the broadnose sevengill shark Notorynchus cepedianus in the marine temperate environment of a Northern Patagonian bay (Argentina). We expected N. cepedianus to exhibit strong seasonality in the bay driven by the seasonal occurrence of important marine mammal prey. However, an alternative or complementary hypothesis arose from the possibility that N. cepedianus uses the area seasonally as mating grounds. To explore these hypotheses, a suite of baited remote underwater video stations and catch per unit effort data indices were used to estimate the seasonal relative abundance of the species inside the bay. Reproductive hormone levels were measured to determine reproductive status and maturity stages of the population. Results indicated that N. cepedianus uses the bay year-round, showing a peak abundance during spring when individuals aggregate, likely for feeding and mating purposes. Male and female total lengths at maturity were 170 and 190 cm, respectively. Contrary to other studies in the Southwest Atlantic, population composition remained similar throughout the seasons, with adults dominating over juveniles, and adult females prevailing in the population at all times. Considering the historical abundance decline recently reported for the species, protection and enforcement within protected areas across the Southwest Atlantic must remain of high priority in government initiatives.
Fil: Irigoyen, Alejo Joaquin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
Fil: de Wysiecki, Agustín María. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
Fil: Trobbiani, Gastón Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
Fil: Bovcon, Nelson Darío. Provincia del Chubut. Secretaría de Pesca; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Awruch, Cynthia Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina. University of Tasmania; Australia
Fil: Argemi, Federico. Fundación Temaiken; Argentina
Fil: Jaureguizar, Andrés Javier. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas; Argentina. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
description Gaining insight on how species relate to their environment and other members of the trophic community is critical for their management. We investigated habitat use, seasonal patterns of abundance and population structure of the broadnose sevengill shark Notorynchus cepedianus in the marine temperate environment of a Northern Patagonian bay (Argentina). We expected N. cepedianus to exhibit strong seasonality in the bay driven by the seasonal occurrence of important marine mammal prey. However, an alternative or complementary hypothesis arose from the possibility that N. cepedianus uses the area seasonally as mating grounds. To explore these hypotheses, a suite of baited remote underwater video stations and catch per unit effort data indices were used to estimate the seasonal relative abundance of the species inside the bay. Reproductive hormone levels were measured to determine reproductive status and maturity stages of the population. Results indicated that N. cepedianus uses the bay year-round, showing a peak abundance during spring when individuals aggregate, likely for feeding and mating purposes. Male and female total lengths at maturity were 170 and 190 cm, respectively. Contrary to other studies in the Southwest Atlantic, population composition remained similar throughout the seasons, with adults dominating over juveniles, and adult females prevailing in the population at all times. Considering the historical abundance decline recently reported for the species, protection and enforcement within protected areas across the Southwest Atlantic must remain of high priority in government initiatives.
publishDate 2018
dc.date.none.fl_str_mv 2018-09
info:eu-repo/date/embargoEnd/2023-11-01
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/11336/88337
Irigoyen, Alejo Joaquin; de Wysiecki, Agustín María; Trobbiani, Gastón Andres; Bovcon, Nelson Darío; Awruch, Cynthia Andrea; et al.; Habitat use, seasonality and demography of an apex predator: Sevengill shark Notorynchus cepedianus in Northern Patagonia; Inter-Research; Marine Ecology Progress Series; 603; 9-2018; 147-160
0171-8630
CONICET Digital
CONICET
url http://hdl.handle.net/11336/88337
identifier_str_mv Irigoyen, Alejo Joaquin; de Wysiecki, Agustín María; Trobbiani, Gastón Andres; Bovcon, Nelson Darío; Awruch, Cynthia Andrea; et al.; Habitat use, seasonality and demography of an apex predator: Sevengill shark Notorynchus cepedianus in Northern Patagonia; Inter-Research; Marine Ecology Progress Series; 603; 9-2018; 147-160
0171-8630
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.3354/meps12715
info:eu-repo/semantics/altIdentifier/url/https://www.int-res.com/abstracts/meps/v603/p147-160/
dc.rights.none.fl_str_mv info:eu-repo/semantics/embargoedAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv embargoedAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
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dc.publisher.none.fl_str_mv Inter-Research
publisher.none.fl_str_mv Inter-Research
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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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