Linking population trends of Antarctic Shag (Phalacrocorax bransfieldensis) and fish at Nelson Island, South Shetland Islands (Antarctica)

This study aims to provide consistent information to explain the steady declining trend in the number of breeding pairs of Antarctic shag Phalacrocorax bransfieldensis in two colonies on Nelson Island, South Shetland Islands, southern Atlantic sector of Antarctica, which was observed during the 1990...

Full description

Bibliographic Details
Authors: Casaux, Ricardo Jorge, Barrera Oro, Esteban
Format: article
Status:Published version
Publication Date:2015
Country:Argentina
Institution:Consejo Nacional de Investigaciones Científicas y Técnicas
Repository:CONICET Digital (CONICET)
Language:English
OAI Identifier:oai:ri.conicet.gov.ar:11336/42284
Online Access:http://hdl.handle.net/11336/42284
Access Level:Open access
Keyword:Antarctic Shag
Inshore Fish
Notothenioids
Population Trends
https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
id AR_964b9ae9cd8db69704b90f275daa00aa
oai_identifier_str oai:ri.conicet.gov.ar:11336/42284
network_acronym_str AR
network_name_str Argentina
repository_id_str
spelling Linking population trends of Antarctic Shag (Phalacrocorax bransfieldensis) and fish at Nelson Island, South Shetland Islands (Antarctica)Casaux, Ricardo JorgeBarrera Oro, EstebanAntarctic ShagInshore FishNotothenioidsPopulation Trendshttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1This study aims to provide consistent information to explain the steady declining trend in the number of breeding pairs of Antarctic shag Phalacrocorax bransfieldensis in two colonies on Nelson Island, South Shetland Islands, southern Atlantic sector of Antarctica, which was observed during the 1990s up to the mid 2000s over an overall monitoring period of over two decades. It addresses correspondence between long-term population trends of inshore demersal fish and inshore-feeding Antarctic shags of this area, where an intensive commercial fishery for shag prey once operated. The analysis also includes comparable information on diet (by examination of regurgitated pellets), foraging patterns, and breeding output of shags from the Danco Coast, western Antarctic Peninsula, an area where no commercial finfish fishery has ever existed. Integral study of these parameters there showed that, in Antarctic shags, low breeding success and high foraging effort might imply low recruitment and high adult mortality, respectively, with both factors adversely affecting the population trends of this bird. In line with these premises, the declining trend observed in shag colonies on the South Shetland Islands appears to have been influenced by the concomitant decrease in abundance of two of their main prey, the nototheniids Notothenia rossii and Gobionotothen gibberifrons, due to intensive industrial fishing in the area in the late 1970s. In comparison, no such pattern occurred for the Danco Coast colonies.Fil: Casaux, Ricardo Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Centro de Investigación Esquel de Montaña y Estepa Patagóica. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Esquel. Centro de Investigación Esquel de Montaña y Estepa Patagónica; Argentina. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; ArgentinaFil: Barrera Oro, Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; ArgentinaSpringer2015-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/42284Casaux, Ricardo Jorge; Barrera Oro, Esteban; Linking population trends of Antarctic Shag (Phalacrocorax bransfieldensis) and fish at Nelson Island, South Shetland Islands (Antarctica); Springer; Polar Biology; 39; 8; 8-2015; 1491-14970722-40601432-2056CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1007/s00300-015-1850-5info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs00300-015-1850-5info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2024-05-08T13:49:40Zoai:ri.conicet.gov.ar:11336/42284instacron: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:34982024-05-08 13:49:40.601CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Linking population trends of Antarctic Shag (Phalacrocorax bransfieldensis) and fish at Nelson Island, South Shetland Islands (Antarctica)
title Linking population trends of Antarctic Shag (Phalacrocorax bransfieldensis) and fish at Nelson Island, South Shetland Islands (Antarctica)
spellingShingle Linking population trends of Antarctic Shag (Phalacrocorax bransfieldensis) and fish at Nelson Island, South Shetland Islands (Antarctica)
Casaux, Ricardo Jorge
Antarctic Shag
Inshore Fish
Notothenioids
Population Trends
https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
title_short Linking population trends of Antarctic Shag (Phalacrocorax bransfieldensis) and fish at Nelson Island, South Shetland Islands (Antarctica)
title_full Linking population trends of Antarctic Shag (Phalacrocorax bransfieldensis) and fish at Nelson Island, South Shetland Islands (Antarctica)
title_fullStr Linking population trends of Antarctic Shag (Phalacrocorax bransfieldensis) and fish at Nelson Island, South Shetland Islands (Antarctica)
title_full_unstemmed Linking population trends of Antarctic Shag (Phalacrocorax bransfieldensis) and fish at Nelson Island, South Shetland Islands (Antarctica)
title_sort Linking population trends of Antarctic Shag (Phalacrocorax bransfieldensis) and fish at Nelson Island, South Shetland Islands (Antarctica)
dc.creator.none.fl_str_mv Casaux, Ricardo Jorge
Barrera Oro, Esteban
author Casaux, Ricardo Jorge
author_facet Casaux, Ricardo Jorge
Barrera Oro, Esteban
author_role author
author2 Barrera Oro, Esteban
author2_role author
dc.subject.none.fl_str_mv Antarctic Shag
Inshore Fish
Notothenioids
Population Trends
https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
topic Antarctic Shag
Inshore Fish
Notothenioids
Population Trends
https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
description This study aims to provide consistent information to explain the steady declining trend in the number of breeding pairs of Antarctic shag Phalacrocorax bransfieldensis in two colonies on Nelson Island, South Shetland Islands, southern Atlantic sector of Antarctica, which was observed during the 1990s up to the mid 2000s over an overall monitoring period of over two decades. It addresses correspondence between long-term population trends of inshore demersal fish and inshore-feeding Antarctic shags of this area, where an intensive commercial fishery for shag prey once operated. The analysis also includes comparable information on diet (by examination of regurgitated pellets), foraging patterns, and breeding output of shags from the Danco Coast, western Antarctic Peninsula, an area where no commercial finfish fishery has ever existed. Integral study of these parameters there showed that, in Antarctic shags, low breeding success and high foraging effort might imply low recruitment and high adult mortality, respectively, with both factors adversely affecting the population trends of this bird. In line with these premises, the declining trend observed in shag colonies on the South Shetland Islands appears to have been influenced by the concomitant decrease in abundance of two of their main prey, the nototheniids Notothenia rossii and Gobionotothen gibberifrons, due to intensive industrial fishing in the area in the late 1970s. In comparison, no such pattern occurred for the Danco Coast colonies.
publishDate 2015
dc.date.none.fl_str_mv 2015-08
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/11336/42284
Casaux, Ricardo Jorge; Barrera Oro, Esteban; Linking population trends of Antarctic Shag (Phalacrocorax bransfieldensis) and fish at Nelson Island, South Shetland Islands (Antarctica); Springer; Polar Biology; 39; 8; 8-2015; 1491-1497
0722-4060
1432-2056
CONICET Digital
CONICET
url http://hdl.handle.net/11336/42284
identifier_str_mv Casaux, Ricardo Jorge; Barrera Oro, Esteban; Linking population trends of Antarctic Shag (Phalacrocorax bransfieldensis) and fish at Nelson Island, South Shetland Islands (Antarctica); Springer; Polar Biology; 39; 8; 8-2015; 1491-1497
0722-4060
1432-2056
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1007/s00300-015-1850-5
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs00300-015-1850-5
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 Springer
publisher.none.fl_str_mv Springer
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
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
_version_ 1799195345209524224
score 15,812455

Similar Items