Does size matter? Relating consumed prey sizes and diet composition of otters in South Iberian coastal streams

We analysed seasonal changes in the sizes of prey [grey mullets (Mugilidae), flatfish (Soleidae), eelAnguilla anguilla and crayfishProcambarus clarkii] consumed by ottersLutra lutra Linnaeus, 1758 in a Mediterranean-climate coastal area and relate them to the frequencies of occurrence of each prey s...

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Detalles Bibliográficos
Autores: Clavero, Miguel, Prenda, José, Delibes, M.
Tipo de recurso: artículo
Fecha de publicación:2007
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/39703
Acceso en línea:http://hdl.handle.net/10261/39703
Access Level:acceso abierto
Palabra clave:Lutra lutra
Predation
Prey selection
Estuaries
Mediterranean streams
Fish
Human disturbance
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spelling Does size matter? Relating consumed prey sizes and diet composition of otters in South Iberian coastal streamsClavero, MiguelPrenda, JoséDelibes, M.Lutra lutraPredationPrey selectionEstuariesMediterranean streamsFishHuman disturbanceWe analysed seasonal changes in the sizes of prey [grey mullets (Mugilidae), flatfish (Soleidae), eelAnguilla anguilla and crayfishProcambarus clarkii] consumed by ottersLutra lutra Linnaeus, 1758 in a Mediterranean-climate coastal area and relate them to the frequencies of occurrence of each prey species in otter diet. The sizes of over 1500 otter prey were estimated from measurements of key pieces found in 814 otter spraints, which were collected in lower stream stretches in a sandy coastal area. Clear relationships between mean prey size and frequency of occurrence were observed for the four prey types. These relationships were positive for grey mullets, flatfish and crayfish (ie they occurred more in otter diet when more large individuals were predated), but was negative in the case of eels. Results suggest that these patterns could be related to seasonal changes in habitat use. Previous works in the study area showed that otter concentrate its predation efforts in freshwater stream stretches during spring and summer, when more and larger crayfish are available. Freshwater stretches have neither grey mullets nor flatfish, while eels are larger and scarcer there than near streams’ mouths, where crayfish is absent.Peer reviewedSpringer Nature201120112007info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/39703reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésHttp://dx.doi.org/10.1007/BF03194197info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/397032026-05-22T06:33:51Z
dc.title.none.fl_str_mv Does size matter? Relating consumed prey sizes and diet composition of otters in South Iberian coastal streams
title Does size matter? Relating consumed prey sizes and diet composition of otters in South Iberian coastal streams
spellingShingle Does size matter? Relating consumed prey sizes and diet composition of otters in South Iberian coastal streams
Clavero, Miguel
Lutra lutra
Predation
Prey selection
Estuaries
Mediterranean streams
Fish
Human disturbance
title_short Does size matter? Relating consumed prey sizes and diet composition of otters in South Iberian coastal streams
title_full Does size matter? Relating consumed prey sizes and diet composition of otters in South Iberian coastal streams
title_fullStr Does size matter? Relating consumed prey sizes and diet composition of otters in South Iberian coastal streams
title_full_unstemmed Does size matter? Relating consumed prey sizes and diet composition of otters in South Iberian coastal streams
title_sort Does size matter? Relating consumed prey sizes and diet composition of otters in South Iberian coastal streams
dc.creator.none.fl_str_mv Clavero, Miguel
Prenda, José
Delibes, M.
author Clavero, Miguel
author_facet Clavero, Miguel
Prenda, José
Delibes, M.
author_role author
author2 Prenda, José
Delibes, M.
author2_role author
author
dc.subject.none.fl_str_mv Lutra lutra
Predation
Prey selection
Estuaries
Mediterranean streams
Fish
Human disturbance
topic Lutra lutra
Predation
Prey selection
Estuaries
Mediterranean streams
Fish
Human disturbance
description We analysed seasonal changes in the sizes of prey [grey mullets (Mugilidae), flatfish (Soleidae), eelAnguilla anguilla and crayfishProcambarus clarkii] consumed by ottersLutra lutra Linnaeus, 1758 in a Mediterranean-climate coastal area and relate them to the frequencies of occurrence of each prey species in otter diet. The sizes of over 1500 otter prey were estimated from measurements of key pieces found in 814 otter spraints, which were collected in lower stream stretches in a sandy coastal area. Clear relationships between mean prey size and frequency of occurrence were observed for the four prey types. These relationships were positive for grey mullets, flatfish and crayfish (ie they occurred more in otter diet when more large individuals were predated), but was negative in the case of eels. Results suggest that these patterns could be related to seasonal changes in habitat use. Previous works in the study area showed that otter concentrate its predation efforts in freshwater stream stretches during spring and summer, when more and larger crayfish are available. Freshwater stretches have neither grey mullets nor flatfish, while eels are larger and scarcer there than near streams’ mouths, where crayfish is absent.
publishDate 2007
dc.date.none.fl_str_mv 2007
2011
2011
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/39703
url http://hdl.handle.net/10261/39703
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Http://dx.doi.org/10.1007/BF03194197
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Springer Nature
publisher.none.fl_str_mv Springer Nature
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 15,811543

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