Size structure of Antarctic krill inferred from samples of Pygoscelid penguin diets and those collected by the commercial krill fishery

In the Antarctic Peninsula, during the chick-rearing period Adelie (Pygoscelis adeliae) and gentoo (P. papua) penguins feed primarily on Antarctic krill (Euphausia superba), which is also exploited by the commercial fishery. Krill length and proportion of juvenile krill consumed by these predators t...

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Detalhes bibliográficos
Autores: Juáres, Mariana Alejandra, Grech, Marta Gladys, Casaux, Ricardo Jorge, Negrete, Javier, Fógel, Jazmín, Coria, Néstor Rubén, Santos, María Mercedes
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2021
País:Argentina
Recursos:Universidad Nacional de La Plata
Repositorio:SEDICI (UNLP)
Idioma:inglés
OAI Identifier:oai:sedici.unlp.edu.ar:10915/132482
Acesso em linha:http://sedici.unlp.edu.ar/handle/10915/132482
Access Level:acceso abierto
Palavra-chave:Biología
Pygoscelis adeliae
Pygoscelis papua
SISO database
Euphausia superba
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spelling Size structure of Antarctic krill inferred from samples of Pygoscelid penguin diets and those collected by the commercial krill fisheryJuáres, Mariana AlejandraGrech, Marta GladysCasaux, Ricardo JorgeNegrete, JavierFógel, JazmínCoria, Néstor RubénSantos, María MercedesBiologíaPygoscelis adeliaePygoscelis papuaSISO databaseEuphausia superbaIn the Antarctic Peninsula, during the chick-rearing period Adelie (Pygoscelis adeliae) and gentoo (P. papua) penguins feed primarily on Antarctic krill (Euphausia superba), which is also exploited by the commercial fishery. Krill length and proportion of juvenile krill consumed by these predators that breed at Stranger Point, South Shetland Islands (from 2007/2008 to 2015/2016), and those collected by the krill fishery in the Mar de la Flota/Bransfield Strait (from 2009/2010 to 2015/2016) were compared to evaluate the potential of each data source as an indicator of changes in the size composition and so, in the demographic structure of the krill population. Overall, the mean krill size taken by gentoo penguins was larger than that ingested by Adelie penguins, which consumed higher proportions of juvenile (≤ 35 mm) and one-year-old (≤ 25 mm) krill. Although the krill size caught by the fishery was statistically similar to that taken by both penguin species, there were differences in the frequency distributions of krill size among the three databases. Furthermore, when only adult krill (> 35 mm) was considered, the three sources of krill data showed a similar inter-annual variation in the availability of adult krill cohorts. Our findings suggest that each database analysed here can potentially provide different information (although complementary) about krill size composition. In addition, inter-annual fluctuations in the smaller size classes of krill likely reflect their first year of recruitment and, therefore, may be used as an indicator of shifts in local krill availability.Facultad de Ciencias Naturales y MuseoFacultad de Ciencias Exactas2021info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/132482enginfo:eu-repo/semantics/altIdentifier/issn/0025-3162info:eu-repo/semantics/altIdentifier/issn/1432-1793info:eu-repo/semantics/altIdentifier/doi/10.1007/s00227-021-03831-0info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2024-05-08T13:10:37Zoai:sedici.unlp.edu.ar:10915/132482Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292024-05-08 13:10:37.91SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Size structure of Antarctic krill inferred from samples of Pygoscelid penguin diets and those collected by the commercial krill fishery
title Size structure of Antarctic krill inferred from samples of Pygoscelid penguin diets and those collected by the commercial krill fishery
spellingShingle Size structure of Antarctic krill inferred from samples of Pygoscelid penguin diets and those collected by the commercial krill fishery
Juáres, Mariana Alejandra
Biología
Pygoscelis adeliae
Pygoscelis papua
SISO database
Euphausia superba
title_short Size structure of Antarctic krill inferred from samples of Pygoscelid penguin diets and those collected by the commercial krill fishery
title_full Size structure of Antarctic krill inferred from samples of Pygoscelid penguin diets and those collected by the commercial krill fishery
title_fullStr Size structure of Antarctic krill inferred from samples of Pygoscelid penguin diets and those collected by the commercial krill fishery
title_full_unstemmed Size structure of Antarctic krill inferred from samples of Pygoscelid penguin diets and those collected by the commercial krill fishery
title_sort Size structure of Antarctic krill inferred from samples of Pygoscelid penguin diets and those collected by the commercial krill fishery
dc.creator.none.fl_str_mv Juáres, Mariana Alejandra
Grech, Marta Gladys
Casaux, Ricardo Jorge
Negrete, Javier
Fógel, Jazmín
Coria, Néstor Rubén
Santos, María Mercedes
author Juáres, Mariana Alejandra
author_facet Juáres, Mariana Alejandra
Grech, Marta Gladys
Casaux, Ricardo Jorge
Negrete, Javier
Fógel, Jazmín
Coria, Néstor Rubén
Santos, María Mercedes
author_role author
author2 Grech, Marta Gladys
Casaux, Ricardo Jorge
Negrete, Javier
Fógel, Jazmín
Coria, Néstor Rubén
Santos, María Mercedes
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Biología
Pygoscelis adeliae
Pygoscelis papua
SISO database
Euphausia superba
topic Biología
Pygoscelis adeliae
Pygoscelis papua
SISO database
Euphausia superba
description In the Antarctic Peninsula, during the chick-rearing period Adelie (Pygoscelis adeliae) and gentoo (P. papua) penguins feed primarily on Antarctic krill (Euphausia superba), which is also exploited by the commercial fishery. Krill length and proportion of juvenile krill consumed by these predators that breed at Stranger Point, South Shetland Islands (from 2007/2008 to 2015/2016), and those collected by the krill fishery in the Mar de la Flota/Bransfield Strait (from 2009/2010 to 2015/2016) were compared to evaluate the potential of each data source as an indicator of changes in the size composition and so, in the demographic structure of the krill population. Overall, the mean krill size taken by gentoo penguins was larger than that ingested by Adelie penguins, which consumed higher proportions of juvenile (≤ 35 mm) and one-year-old (≤ 25 mm) krill. Although the krill size caught by the fishery was statistically similar to that taken by both penguin species, there were differences in the frequency distributions of krill size among the three databases. Furthermore, when only adult krill (> 35 mm) was considered, the three sources of krill data showed a similar inter-annual variation in the availability of adult krill cohorts. Our findings suggest that each database analysed here can potentially provide different information (although complementary) about krill size composition. In addition, inter-annual fluctuations in the smaller size classes of krill likely reflect their first year of recruitment and, therefore, may be used as an indicator of shifts in local krill availability.
publishDate 2021
dc.date.none.fl_str_mv 2021
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
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://sedici.unlp.edu.ar/handle/10915/132482
url http://sedici.unlp.edu.ar/handle/10915/132482
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0025-3162
info:eu-repo/semantics/altIdentifier/issn/1432-1793
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00227-021-03831-0
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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