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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Detalles Bibliográficos
Autores principales: Juáres, Mariana Alejandra, Grech, Marta Gladys, Casaux, Ricardo Jorge, Negrete, Javier, Fógel, Jazmín, Coria, Néstor Rubén, Santos, María Mercedes
Formato: Articulo
Lenguaje:Inglés
Publicado: 2021
Materias:
Biología
Pygoscelis adeliae
Pygoscelis papua
SISO database
Euphausia superba
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/132482
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-132482
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Biología
Pygoscelis adeliae
Pygoscelis papua
SISO database
Euphausia superba
spellingShingle Biología
Pygoscelis adeliae
Pygoscelis papua
SISO database
Euphausia superba
Juáres, Mariana Alejandra
Grech, Marta Gladys
Casaux, Ricardo Jorge
Negrete, Javier
Fógel, Jazmín
Coria, Néstor Rubén
Santos, María Mercedes
Size structure of Antarctic krill inferred from samples of Pygoscelid penguin diets and those collected by the commercial krill fishery
topic_facet 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.
format Articulo
Articulo
author Juáres, Mariana Alejandra
Grech, Marta Gladys
Casaux, Ricardo Jorge
Negrete, Javier
Fógel, Jazmín
Coria, Néstor Rubén
Santos, María Mercedes
author_facet Juáres, Mariana Alejandra
Grech, Marta Gladys
Casaux, Ricardo Jorge
Negrete, Javier
Fógel, Jazmín
Coria, Néstor Rubén
Santos, María Mercedes
author_sort Juáres, Mariana Alejandra
title Size structure of Antarctic krill inferred from samples of Pygoscelid penguin diets and those collected by the commercial krill fishery
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
publishDate 2021
url http://sedici.unlp.edu.ar/handle/10915/132482
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