Capture and consumption of prey of the otter (Lutra lutra) in Mediterranean freshwater habitats of the Iberian Peninsula

[EN]: The otter feeds almost exclusively on aquatic and semiaquatic species, catching them in watercourses and waterbodies. Foraging and prey consumption studies in freshwater habitats are scarce. Iberian otters caught between 3 and 5 fish/hour of observation in Mediterranean rivers, except during p...

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Detalles Bibliográficos
Autores: Ruiz-Olmo, Jordi, Jiménez, José, Margalida, Antoni
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:1998
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/180330
Acceso en línea:http://hdl.handle.net/10261/180330
Access Level:acceso abierto
Palabra clave:Food
Mediterranean habitats
Otter
Predation
Alimentación
Depredación
Hábitats mediterráneos
Nutria
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spelling Capture and consumption of prey of the otter (Lutra lutra) in Mediterranean freshwater habitats of the Iberian PeninsulaCaptura y consumo de las presas por la nutria (Lutra lutra) en hábitats fluviales mediterráneos de la Península IbéricaRuiz-Olmo, JordiJiménez, JoséMargalida, AntoniFoodMediterranean habitatsOtterPredationAlimentaciónDepredaciónHábitats mediterráneosNutria[EN]: The otter feeds almost exclusively on aquatic and semiaquatic species, catching them in watercourses and waterbodies. Foraging and prey consumption studies in freshwater habitats are scarce. Iberian otters caught between 3 and 5 fish/hour of observation in Mediterranean rivers, except during periods of fish shortage, when dropped to 1 fish/hour or less. On 98.2% of occasions the consumption of prey took place in the water, upon river features such as rocks, islands or stones, or at less than 1.50 m from the water edge. Almost all fish of less than 100 g were eaten whole, but left parts of large fish; gravide fish females; claws, legs and heads of crayfish; and toad skins. A food-limited species like the otter is under pressure to optimise the use if its food resources. The prey or parts of prey are left as a last resort in order to avoid injury, intoxications, because the daily food needs have been met, because disturbance, or because of immature behaviour in the case of cubs. For this reason, densities of fish remains are very low, but crayfish and toad remains densities can be high. Density of remains of prey depends more on the characteristics of the prey than the abundance of otters and prey. Results obtained are of importance when evaluating the biomass of the prey in the studies of diet, because parts of prey which are not consumed systematically.[ES]: La nutria se alimenta casi exclusivamente de especies acuáticas y semiacuáticas, que captura en de cursos y masas de agua. Los estudios sobre la búsqueda, captura y consumo de las presas son escasos. Los ejemplares ibéricos capturaron entre 3 y 4 peces/hora de observación en ríos mediterráneos, excepto durante épocas de escasez de peces, descendiendo entonces a 1 pez/hora o menos. En un 98.2% de las ocasiones, las presas fueron consumidas en el agua, en una roca, piedra, isla o similar, o a menos de 1,50 m de la orilla. La práctica totalidad de los peces de menos de 100 g fueron consumidos por entero, pero abandonaron partes significativas de los peces mayores, de las hembras grávidas de peces, de cangrejos (pinzas, patas y cabezas) y de pieles de sapos. Una especie limitada por la disponibilidad de alimento, como es el caso de la nutria, está bajo presión para optimizar el uso de sus recursos. Las partes de las presas abandonadas son una forma de evitar heridas o intoxicaciones, aunque pueden serlo por también saciedad, molestias o por la conducta de juego de las crías. Por estas razones, las densidades de restos de presas son muy bajas, excepto local o temporalmente para cangrejos o sapos. La densidad de restos depende más de sus características que de la abundancia en el medio de nutrias y de presas. Los resultados obtenidos son de importancia para la evaluación de la biomasa ingerida de cada categoría de presas en los estudios sobre la dieta, ya que algunas partes de las presas son abandonadas sistemáticamentePeer reviewedSociedad Española para la Conservación y Estudio de los Mamíferos201920191998info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/180330reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésNoinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1803302026-05-22T06:33:51Z
dc.title.none.fl_str_mv Capture and consumption of prey of the otter (Lutra lutra) in Mediterranean freshwater habitats of the Iberian Peninsula
Captura y consumo de las presas por la nutria (Lutra lutra) en hábitats fluviales mediterráneos de la Península Ibérica
title Capture and consumption of prey of the otter (Lutra lutra) in Mediterranean freshwater habitats of the Iberian Peninsula
spellingShingle Capture and consumption of prey of the otter (Lutra lutra) in Mediterranean freshwater habitats of the Iberian Peninsula
Ruiz-Olmo, Jordi
Food
Mediterranean habitats
Otter
Predation
Alimentación
Depredación
Hábitats mediterráneos
Nutria
title_short Capture and consumption of prey of the otter (Lutra lutra) in Mediterranean freshwater habitats of the Iberian Peninsula
title_full Capture and consumption of prey of the otter (Lutra lutra) in Mediterranean freshwater habitats of the Iberian Peninsula
title_fullStr Capture and consumption of prey of the otter (Lutra lutra) in Mediterranean freshwater habitats of the Iberian Peninsula
title_full_unstemmed Capture and consumption of prey of the otter (Lutra lutra) in Mediterranean freshwater habitats of the Iberian Peninsula
title_sort Capture and consumption of prey of the otter (Lutra lutra) in Mediterranean freshwater habitats of the Iberian Peninsula
dc.creator.none.fl_str_mv Ruiz-Olmo, Jordi
Jiménez, José
Margalida, Antoni
author Ruiz-Olmo, Jordi
author_facet Ruiz-Olmo, Jordi
Jiménez, José
Margalida, Antoni
author_role author
author2 Jiménez, José
Margalida, Antoni
author2_role author
author
dc.subject.none.fl_str_mv Food
Mediterranean habitats
Otter
Predation
Alimentación
Depredación
Hábitats mediterráneos
Nutria
topic Food
Mediterranean habitats
Otter
Predation
Alimentación
Depredación
Hábitats mediterráneos
Nutria
description [EN]: The otter feeds almost exclusively on aquatic and semiaquatic species, catching them in watercourses and waterbodies. Foraging and prey consumption studies in freshwater habitats are scarce. Iberian otters caught between 3 and 5 fish/hour of observation in Mediterranean rivers, except during periods of fish shortage, when dropped to 1 fish/hour or less. On 98.2% of occasions the consumption of prey took place in the water, upon river features such as rocks, islands or stones, or at less than 1.50 m from the water edge. Almost all fish of less than 100 g were eaten whole, but left parts of large fish; gravide fish females; claws, legs and heads of crayfish; and toad skins. A food-limited species like the otter is under pressure to optimise the use if its food resources. The prey or parts of prey are left as a last resort in order to avoid injury, intoxications, because the daily food needs have been met, because disturbance, or because of immature behaviour in the case of cubs. For this reason, densities of fish remains are very low, but crayfish and toad remains densities can be high. Density of remains of prey depends more on the characteristics of the prey than the abundance of otters and prey. Results obtained are of importance when evaluating the biomass of the prey in the studies of diet, because parts of prey which are not consumed systematically.
publishDate 1998
dc.date.none.fl_str_mv 1998
2019
2019
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/180330
url http://hdl.handle.net/10261/180330
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv No
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Sociedad Española para la Conservación y Estudio de los Mamíferos
publisher.none.fl_str_mv Sociedad Española para la Conservación y Estudio de los Mamíferos
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812429

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