The diet of the South Georgia shag Phalacrocorax georgianus at South Orkney Islands in five consecutive years

The diet of the South Georgia shag Phalacrocorax georgianus at Laurie Island, South Orkney Islands, was studied by the analysis of 420 pellets (regurgitated casts) collected from the 1995 to 1999 breeding seasons. Demersal-benthic fish were by far the main prey, followed by molluscs (mainly octopods...

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Published in:Polar Biology
Main Authors: Casaux, Ricardo Jorge, Ramon, Analia Ines
Format: Article in Journal/Newspaper
Language:English
Published: Springer
Subjects:
FOOD AVAILABILITY
BIVALVE
ALTERNATIVE EXPLANATION
BREEDING SEASON
https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
Argentino
Argentina
South Orkney Islands
Laurie
Ricardo
Antarc*
antarcticus
Dirección Nacional del Antártico
Instituto Antártico Argentino
Laurie Island
Polar Biology
Online Access:http://hdl.handle.net/11336/97289
id ftconicet:oai:ri.conicet.gov.ar:11336/97289
record_format openpolar
spelling ftconicet:oai:ri.conicet.gov.ar:11336/97289 2023-10-09T21:45:54+02:00 The diet of the South Georgia shag Phalacrocorax georgianus at South Orkney Islands in five consecutive years Casaux, Ricardo Jorge Ramon, Analia Ines application/pdf http://hdl.handle.net/11336/97289 eng eng Springer info:eu-repo/semantics/altIdentifier/doi/10.1007/s00300-002-0389-4 info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs00300-002-0389-4 http://hdl.handle.net/11336/97289 Casaux, Ricardo Jorge; Ramon, Analia Ines; The diet of the South Georgia shag Phalacrocorax georgianus at South Orkney Islands in five consecutive years; Springer; Polar Biology; 25; 4-2002; 557-561 0722-4060 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ FOOD AVAILABILITY BIVALVE ALTERNATIVE EXPLANATION BREEDING SEASON 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/s00300-002-0389-4 2023-09-24T18:58:27Z The diet of the South Georgia shag Phalacrocorax georgianus at Laurie Island, South Orkney Islands, was studied by the analysis of 420 pellets (regurgitated casts) collected from the 1995 to 1999 breeding seasons. Demersal-benthic fish were by far the main prey, followed by molluscs (mainly octopods and bivalves) and polychaetes. Harpagifer antarcticus (in 1995, 1998, 1999) and Lepidonotothen nudifrons (1996, 1997) were the most frequent prey, followed by Gobionotothen gibberifrons or Trematomus newnesi. Harpagifer antarcticus, followed by L. nudifrons or T. newnesi, was the most numerous prey in all of the seasons and predominated in mass in 1995 and 1996, followed by Notothenia coriiceps and L. nudifrons. In 1997 and 1999, G. gibberifrons and N. coriiceps were the species that most contributed to the diet whereas N. coriiceps and H. antarcticus contributed most in 1998. Our results differ from those reported for the South Orkney Islands in previous studies. These differences could be due to the use of different diet-analysis methods and to shags-related and/or fisheries-related changes in the food availability around the colonies. These alternative explanations are analysed and discussed. Fil: Casaux, Ricardo Jorge. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Ramon, Analia Ines. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina Article in Journal/Newspaper Antarc* antarcticus Dirección Nacional del Antártico Instituto Antártico Argentino Laurie Island Polar Biology South Orkney Islands CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Argentino Argentina South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) Laurie ENVELOPE(-44.616,-44.616,-60.733,-60.733) Ricardo ENVELOPE(-63.033,-63.033,-64.867,-64.867) Polar Biology 25 8 557 561
institution Open Polar
collection CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
op_collection_id ftconicet
language English
topic FOOD AVAILABILITY
BIVALVE
ALTERNATIVE EXPLANATION
BREEDING SEASON
https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
spellingShingle FOOD AVAILABILITY
BIVALVE
ALTERNATIVE EXPLANATION
BREEDING SEASON
https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
Casaux, Ricardo Jorge
Ramon, Analia Ines
The diet of the South Georgia shag Phalacrocorax georgianus at South Orkney Islands in five consecutive years
topic_facet FOOD AVAILABILITY
BIVALVE
ALTERNATIVE EXPLANATION
BREEDING SEASON
https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
description The diet of the South Georgia shag Phalacrocorax georgianus at Laurie Island, South Orkney Islands, was studied by the analysis of 420 pellets (regurgitated casts) collected from the 1995 to 1999 breeding seasons. Demersal-benthic fish were by far the main prey, followed by molluscs (mainly octopods and bivalves) and polychaetes. Harpagifer antarcticus (in 1995, 1998, 1999) and Lepidonotothen nudifrons (1996, 1997) were the most frequent prey, followed by Gobionotothen gibberifrons or Trematomus newnesi. Harpagifer antarcticus, followed by L. nudifrons or T. newnesi, was the most numerous prey in all of the seasons and predominated in mass in 1995 and 1996, followed by Notothenia coriiceps and L. nudifrons. In 1997 and 1999, G. gibberifrons and N. coriiceps were the species that most contributed to the diet whereas N. coriiceps and H. antarcticus contributed most in 1998. Our results differ from those reported for the South Orkney Islands in previous studies. These differences could be due to the use of different diet-analysis methods and to shags-related and/or fisheries-related changes in the food availability around the colonies. These alternative explanations are analysed and discussed. Fil: Casaux, Ricardo Jorge. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Ramon, Analia Ines. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina
format Article in Journal/Newspaper
author Casaux, Ricardo Jorge
Ramon, Analia Ines
author_facet Casaux, Ricardo Jorge
Ramon, Analia Ines
author_sort Casaux, Ricardo Jorge
title The diet of the South Georgia shag Phalacrocorax georgianus at South Orkney Islands in five consecutive years
title_short The diet of the South Georgia shag Phalacrocorax georgianus at South Orkney Islands in five consecutive years
title_full The diet of the South Georgia shag Phalacrocorax georgianus at South Orkney Islands in five consecutive years
title_fullStr The diet of the South Georgia shag Phalacrocorax georgianus at South Orkney Islands in five consecutive years
title_full_unstemmed The diet of the South Georgia shag Phalacrocorax georgianus at South Orkney Islands in five consecutive years
title_sort diet of the south georgia shag phalacrocorax georgianus at south orkney islands in five consecutive years
publisher Springer
url http://hdl.handle.net/11336/97289
long_lat ENVELOPE(-45.500,-45.500,-60.583,-60.583)
ENVELOPE(-44.616,-44.616,-60.733,-60.733)
ENVELOPE(-63.033,-63.033,-64.867,-64.867)
geographic Argentino
Argentina
South Orkney Islands
Laurie
Ricardo
geographic_facet Argentino
Argentina
South Orkney Islands
Laurie
Ricardo
genre Antarc*
antarcticus
Dirección Nacional del Antártico
Instituto Antártico Argentino
Laurie Island
Polar Biology
South Orkney Islands
genre_facet Antarc*
antarcticus
Dirección Nacional del Antártico
Instituto Antártico Argentino
Laurie Island
Polar Biology
South Orkney Islands
op_relation info:eu-repo/semantics/altIdentifier/doi/10.1007/s00300-002-0389-4
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs00300-002-0389-4
http://hdl.handle.net/11336/97289
Casaux, Ricardo Jorge; Ramon, Analia Ines; The diet of the South Georgia shag Phalacrocorax georgianus at South Orkney Islands in five consecutive years; Springer; Polar Biology; 25; 4-2002; 557-561
0722-4060
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/s00300-002-0389-4
container_title Polar Biology
container_volume 25
container_issue 8
container_start_page 557
op_container_end_page 561
_version_ 1779321568947601408

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