Fish prey of Weddell seals, <i>Leptonychotes weddellii</i>, at Hope Bay, Antarctic Peninsula, during the late summer

The study of the feeding habits of Weddell seals, <i>Leptonychotes weddellii</i>, in the area of west Antarctic Peninsula is essential to understand the role they play in the marine food webs, especially considering that this is one of the regions most affected by climate change. With th...

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Autores principales: Daneri, Gustavo Adolfo, Negri, Agustina, Coria, Néstor Rubén, Negrete, Javier, Libertelli, Marcela M., Corbalán, A.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2018
Materias:
Ciencias Naturales
Leptonychotes
Fish
Diet
Pleuragramma
Antarctic Peninsula
ENSO
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/134062
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-134062
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Leptonychotes
Fish
Diet
Pleuragramma
Antarctic Peninsula
ENSO
spellingShingle Ciencias Naturales
Leptonychotes
Fish
Diet
Pleuragramma
Antarctic Peninsula
ENSO
Daneri, Gustavo Adolfo
Negri, Agustina
Coria, Néstor Rubén
Negrete, Javier
Libertelli, Marcela M.
Corbalán, A.
Fish prey of Weddell seals, <i>Leptonychotes weddellii</i>, at Hope Bay, Antarctic Peninsula, during the late summer
topic_facet Ciencias Naturales
Leptonychotes
Fish
Diet
Pleuragramma
Antarctic Peninsula
ENSO
description The study of the feeding habits of Weddell seals, <i>Leptonychotes weddellii</i>, in the area of west Antarctic Peninsula is essential to understand the role they play in the marine food webs, especially considering that this is one of the regions most affected by climate change. With the aim of detecting temporal changes in the fish predation pattern of seals, a total of 217 scats were collected at Hope Bay, during three consecutive summers (2003, 2004 and 2005). The family Nototheniidae comprised over 80% in numbers of fish preyed by seals. The Antarctic silverfish, <i>Pleuragramma antarctica</i>, was, by far, the most frequent and abundant prey species with a mean percentage frequency of occurrence of 48.7% and representing in average 52.1% in numbers of the fish consumed by seals. Other fish species of lesser importance were the nototheniids <i>Trematomus newnesi</i>, <i>Lepidonotothen larseni</i>, <i>Gobionotothen gibberifrons</i> and the channichthyid <i>Chionodraco rastrospinosus</i>. Temporal variation was observed not only in the relative proportions of the different fish prey taxa but also in the sizes of the dominant prey, <i>P. antarctica</i>. Given the high trophic vulnerability of this species to changes in abiotic factors and food web structure and dynamics, a possible influence of El Nino Southern Oscillation events of 2002–2003 and 2004–2005 should not be discarded. Moreover, special attention should be addressed to its population status, distribution and spatial/temporal availability as prey resource of upper trophic level consumers such as <i>L. weddellii</i> which largely depend on <i>P. antarctica</i>.
format Articulo
Articulo
author Daneri, Gustavo Adolfo
Negri, Agustina
Coria, Néstor Rubén
Negrete, Javier
Libertelli, Marcela M.
Corbalán, A.
author_facet Daneri, Gustavo Adolfo
Negri, Agustina
Coria, Néstor Rubén
Negrete, Javier
Libertelli, Marcela M.
Corbalán, A.
author_sort Daneri, Gustavo Adolfo
title Fish prey of Weddell seals, <i>Leptonychotes weddellii</i>, at Hope Bay, Antarctic Peninsula, during the late summer
title_short Fish prey of Weddell seals, <i>Leptonychotes weddellii</i>, at Hope Bay, Antarctic Peninsula, during the late summer
title_full Fish prey of Weddell seals, <i>Leptonychotes weddellii</i>, at Hope Bay, Antarctic Peninsula, during the late summer
title_fullStr Fish prey of Weddell seals, <i>Leptonychotes weddellii</i>, at Hope Bay, Antarctic Peninsula, during the late summer
title_full_unstemmed Fish prey of Weddell seals, <i>Leptonychotes weddellii</i>, at Hope Bay, Antarctic Peninsula, during the late summer
title_sort fish prey of weddell seals, <i>leptonychotes weddellii</i>, at hope bay, antarctic peninsula, during the late summer
publishDate 2018
url http://sedici.unlp.edu.ar/handle/10915/134062
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