Fish prey of Weddell seals, Leptonychotes weddellii , at Hope Bay, Antarctic Peninsula, during the late summer
The study of the feeding habits of Weddell seals, Leptonychotes weddellii , 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...
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ftunivlaplata:oai:sedici.unlp.edu.ar:10915/134062 2023-05-15T14:01:55+02:00 Fish prey of Weddell seals, Leptonychotes weddellii , at Hope Bay, Antarctic Peninsula, during the late summer Daneri, Gustavo Adolfo Negri, Agustina Coria, Néstor Rubén Negrete, Javier Libertelli, Marcela M. Corbalán, A. 2018-05 application/pdf 1027-1031 http://sedici.unlp.edu.ar/handle/10915/134062 en eng http://sedici.unlp.edu.ar/handle/10915/134062 issn:0722-4060 issn:1432-2056 http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) CC-BY Ciencias Naturales Leptonychotes Fish Diet Pleuragramma Antarctic Peninsula ENSO Articulo 2018 ftunivlaplata 2022-04-10T00:04:38Z The study of the feeding habits of Weddell seals, Leptonychotes weddellii , 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, Pleuragramma antarctica , 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 Trematomus newnesi , Lepidonotothen larseni , Gobionotothen gibberifrons and the channichthyid Chionodraco rastrospinosus . 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, P. antarctica . 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 L. weddellii which largely depend on P. antarctica . Facultad de Ciencias Naturales y Museo Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctic silverfish Antarctica Weddell Seals Universidad Nacional de La Plata (UNLP): SeDiCI (Servicio de Difusión de la Creación Intelectual) Antarctic Antarctic Peninsula Hope Bay ENVELOPE(-57.038,-57.038,-63.403,-63.403) The Antarctic Weddell |
institution |
Open Polar |
collection |
Universidad Nacional de La Plata (UNLP): SeDiCI (Servicio de Difusión de la Creación Intelectual) |
op_collection_id |
ftunivlaplata |
language |
English |
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, Leptonychotes weddellii , 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, Leptonychotes weddellii , 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, Pleuragramma antarctica , 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 Trematomus newnesi , Lepidonotothen larseni , Gobionotothen gibberifrons and the channichthyid Chionodraco rastrospinosus . 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, P. antarctica . 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 L. weddellii which largely depend on P. antarctica . Facultad de Ciencias Naturales y Museo |
format |
Article in Journal/Newspaper |
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, Leptonychotes weddellii , at Hope Bay, Antarctic Peninsula, during the late summer |
title_short |
Fish prey of Weddell seals, Leptonychotes weddellii , at Hope Bay, Antarctic Peninsula, during the late summer |
title_full |
Fish prey of Weddell seals, Leptonychotes weddellii , at Hope Bay, Antarctic Peninsula, during the late summer |
title_fullStr |
Fish prey of Weddell seals, Leptonychotes weddellii , at Hope Bay, Antarctic Peninsula, during the late summer |
title_full_unstemmed |
Fish prey of Weddell seals, Leptonychotes weddellii , at Hope Bay, Antarctic Peninsula, during the late summer |
title_sort |
fish prey of weddell seals, leptonychotes weddellii , at hope bay, antarctic peninsula, during the late summer |
publishDate |
2018 |
url |
http://sedici.unlp.edu.ar/handle/10915/134062 |
long_lat |
ENVELOPE(-57.038,-57.038,-63.403,-63.403) |
geographic |
Antarctic Antarctic Peninsula Hope Bay The Antarctic Weddell |
geographic_facet |
Antarctic Antarctic Peninsula Hope Bay The Antarctic Weddell |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctic silverfish Antarctica Weddell Seals |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctic silverfish Antarctica Weddell Seals |
op_relation |
http://sedici.unlp.edu.ar/handle/10915/134062 issn:0722-4060 issn:1432-2056 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) |
op_rightsnorm |
CC-BY |
_version_ |
1766271991518593024 |