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...
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ftconicet:oai:ri.conicet.gov.ar:11336/42284 2023-10-09T21:45:44+02:00 Linking population trends of Antarctic Shag (Phalacrocorax bransfieldensis) and fish at Nelson Island, South Shetland Islands (Antarctica) Casaux, Ricardo Jorge Barrera Oro, Esteban application/pdf http://hdl.handle.net/11336/42284 eng eng Springer 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 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 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ Antarctic Shag Inshore Fish Notothenioids Population Trends https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1007/s00300-015-1850-5 2023-09-24T19:06:13Z 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. 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; Argentina Fil: ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Dirección Nacional del Antártico Instituto Antártico Argentino Nelson Island Notothenia rossii Polar Biology South Shetland Islands CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Antarctic Antarctic Peninsula Patagonia San Juan South Shetland Islands Argentino Argentina Ricardo ENVELOPE(-63.033,-63.033,-64.867,-64.867) Danco ENVELOPE(-61.033,-61.033,-64.717,-64.717) Danco Coast ENVELOPE(-62.000,-62.000,-64.700,-64.700) Nelson Island ENVELOPE(-59.050,-59.050,-62.300,-62.300) Polar Biology 39 8 1491 1497 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
Antarctic Shag Inshore Fish Notothenioids Population Trends https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
spellingShingle |
Antarctic Shag Inshore Fish Notothenioids Population Trends https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 Casaux, Ricardo Jorge Barrera Oro, Esteban Linking population trends of Antarctic Shag (Phalacrocorax bransfieldensis) and fish at Nelson Island, South Shetland Islands (Antarctica) |
topic_facet |
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. 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; Argentina Fil: ... |
format |
Article in Journal/Newspaper |
author |
Casaux, Ricardo Jorge Barrera Oro, Esteban |
author_facet |
Casaux, Ricardo Jorge Barrera Oro, Esteban |
author_sort |
Casaux, Ricardo Jorge |
title |
Linking population trends of Antarctic Shag (Phalacrocorax bransfieldensis) and fish at Nelson Island, South Shetland Islands (Antarctica) |
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) |
publisher |
Springer |
url |
http://hdl.handle.net/11336/42284 |
long_lat |
ENVELOPE(-63.033,-63.033,-64.867,-64.867) ENVELOPE(-61.033,-61.033,-64.717,-64.717) ENVELOPE(-62.000,-62.000,-64.700,-64.700) ENVELOPE(-59.050,-59.050,-62.300,-62.300) |
geographic |
Antarctic Antarctic Peninsula Patagonia San Juan South Shetland Islands Argentino Argentina Ricardo Danco Danco Coast Nelson Island |
geographic_facet |
Antarctic Antarctic Peninsula Patagonia San Juan South Shetland Islands Argentino Argentina Ricardo Danco Danco Coast Nelson Island |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Dirección Nacional del Antártico Instituto Antártico Argentino Nelson Island Notothenia rossii Polar Biology South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Dirección Nacional del Antártico Instituto Antártico Argentino Nelson Island Notothenia rossii Polar Biology South Shetland Islands |
op_relation |
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 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 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1007/s00300-015-1850-5 |
container_title |
Polar Biology |
container_volume |
39 |
container_issue |
8 |
container_start_page |
1491 |
op_container_end_page |
1497 |
_version_ |
1779321391786491904 |