High trophic overlap within the seabird community of Argentinean Patagonia: a multiscale approach

Autores
Forero, Manuela G.; Bortolotti, Gary R.; Hobson, Keith A.; Donazar, Jose A.; Bertellotti, Néstor Marcelo; Blanco, Guillermo
Año de publicación
2004
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
1. Food web interactions in animal communities can be investigated through the measurement of stable isotopes (e.g. δ15N, δ13C). We used this approach in a community of 14 species of seabirds breeding on the Argentinean Patagonian coast. Tissue samples were collected from nestling and adult seabirds, as well as prey, during three consecutive breeding seasons in 28 breeding colonies. 2. Relative to those in other temperate and polar regions, this seabird community showed a high degree of overlap in trophic level (TL) among species (93% of species within a TL range of 0·7) and also a comparatively high mean trophic level (4·1). 3. Relative positions of seabirds in relation to prey suggest that most species feed on pelagic fish and to a lesser extent on invertebrates. Stable isotope values of specialist feeders, Olrolg’s (Larus atlanticus) and dolphin gulls (Leucophaeus scoresbii), which were previously assumed to feed mainly on crabs and sea lion excrement, respectively, suggested a broader diet than expected. 4. Based on stable isotope values of individuals, groups of phylogenetically related species generally showed a high degree of overlap within each group. 5. Given the degree of isotope overlap in this species-rich community, coexistence could be interpreted as a consequence of superabundance of food or species diversification in morphology and foraging strategies. The short range of trophic level makes these seabirds vulnerable to the reduction of fish stocks due either to commercial fishing or stochastic fluctuations.
Fil: Forero, Manuela G.. Instituto Mediterráneo de Estudios Avanzados; España. Estación Biológica de Doñana; España
Fil: Bortolotti, Gary R.. University Of Saskatchewan; Canadá
Fil: Hobson, Keith A.. University Of Saskatchewan; Canadá
Fil: Donazar, Jose A.. Estación Biológica de Doñana; España
Fil: Bertellotti, Néstor Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: Blanco, Guillermo. Instituto de Investigación en Recursos Cinegéticos; España
Materia
Argentinean Coast of Patagonia
Food Relationships
Seabird Community
Stable-Isotopes
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/29001
Acceder
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network_name_str CONICET Digital (CONICET)
spelling High trophic overlap within the seabird community of Argentinean Patagonia: a multiscale approachForero, Manuela G.Bortolotti, Gary R.Hobson, Keith A.Donazar, Jose A.Bertellotti, Néstor MarceloBlanco, GuillermoArgentinean Coast of PatagoniaFood RelationshipsSeabird CommunityStable-Isotopeshttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/11. Food web interactions in animal communities can be investigated through the measurement of stable isotopes (e.g. δ15N, δ13C). We used this approach in a community of 14 species of seabirds breeding on the Argentinean Patagonian coast. Tissue samples were collected from nestling and adult seabirds, as well as prey, during three consecutive breeding seasons in 28 breeding colonies. 2. Relative to those in other temperate and polar regions, this seabird community showed a high degree of overlap in trophic level (TL) among species (93% of species within a TL range of 0·7) and also a comparatively high mean trophic level (4·1). 3. Relative positions of seabirds in relation to prey suggest that most species feed on pelagic fish and to a lesser extent on invertebrates. Stable isotope values of specialist feeders, Olrolg’s (Larus atlanticus) and dolphin gulls (Leucophaeus scoresbii), which were previously assumed to feed mainly on crabs and sea lion excrement, respectively, suggested a broader diet than expected. 4. Based on stable isotope values of individuals, groups of phylogenetically related species generally showed a high degree of overlap within each group. 5. Given the degree of isotope overlap in this species-rich community, coexistence could be interpreted as a consequence of superabundance of food or species diversification in morphology and foraging strategies. The short range of trophic level makes these seabirds vulnerable to the reduction of fish stocks due either to commercial fishing or stochastic fluctuations.Fil: Forero, Manuela G.. Instituto Mediterráneo de Estudios Avanzados; España. Estación Biológica de Doñana; EspañaFil: Bortolotti, Gary R.. University Of Saskatchewan; CanadáFil: Hobson, Keith A.. University Of Saskatchewan; CanadáFil: Donazar, Jose A.. Estación Biológica de Doñana; EspañaFil: Bertellotti, Néstor Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; ArgentinaFil: Blanco, Guillermo. Instituto de Investigación en Recursos Cinegéticos; EspañaWiley2004-06-26info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/29001Forero, Manuela G.; Bortolotti, Gary R.; Hobson, Keith A.; Donazar, Jose A.; Bertellotti, Néstor Marcelo; et al.; High trophic overlap within the seabird community of Argentinean Patagonia: a multiscale approach; Wiley; Journal Of Animal Ecology; 73; 4; 26-6-2004; 789-8010021-8790CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1111/j.0021-8790.2004.00852.xinfo:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1111/j.0021-8790.2004.00852.x/abstractinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T14:58:38Zoai:ri.conicet.gov.ar:11336/29001instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-15 14:58:38.628CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv High trophic overlap within the seabird community of Argentinean Patagonia: a multiscale approach
title High trophic overlap within the seabird community of Argentinean Patagonia: a multiscale approach
spellingShingle High trophic overlap within the seabird community of Argentinean Patagonia: a multiscale approach
Forero, Manuela G.
Argentinean Coast of Patagonia
Food Relationships
Seabird Community
Stable-Isotopes
title_short High trophic overlap within the seabird community of Argentinean Patagonia: a multiscale approach
title_full High trophic overlap within the seabird community of Argentinean Patagonia: a multiscale approach
title_fullStr High trophic overlap within the seabird community of Argentinean Patagonia: a multiscale approach
title_full_unstemmed High trophic overlap within the seabird community of Argentinean Patagonia: a multiscale approach
title_sort High trophic overlap within the seabird community of Argentinean Patagonia: a multiscale approach
dc.creator.none.fl_str_mv Forero, Manuela G.
Bortolotti, Gary R.
Hobson, Keith A.
Donazar, Jose A.
Bertellotti, Néstor Marcelo
Blanco, Guillermo
author Forero, Manuela G.
author_facet Forero, Manuela G.
Bortolotti, Gary R.
Hobson, Keith A.
Donazar, Jose A.
Bertellotti, Néstor Marcelo
Blanco, Guillermo
author_role author
author2 Bortolotti, Gary R.
Hobson, Keith A.
Donazar, Jose A.
Bertellotti, Néstor Marcelo
Blanco, Guillermo
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Argentinean Coast of Patagonia
Food Relationships
Seabird Community
Stable-Isotopes
topic Argentinean Coast of Patagonia
Food Relationships
Seabird Community
Stable-Isotopes
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv 1. Food web interactions in animal communities can be investigated through the measurement of stable isotopes (e.g. δ15N, δ13C). We used this approach in a community of 14 species of seabirds breeding on the Argentinean Patagonian coast. Tissue samples were collected from nestling and adult seabirds, as well as prey, during three consecutive breeding seasons in 28 breeding colonies. 2. Relative to those in other temperate and polar regions, this seabird community showed a high degree of overlap in trophic level (TL) among species (93% of species within a TL range of 0·7) and also a comparatively high mean trophic level (4·1). 3. Relative positions of seabirds in relation to prey suggest that most species feed on pelagic fish and to a lesser extent on invertebrates. Stable isotope values of specialist feeders, Olrolg’s (Larus atlanticus) and dolphin gulls (Leucophaeus scoresbii), which were previously assumed to feed mainly on crabs and sea lion excrement, respectively, suggested a broader diet than expected. 4. Based on stable isotope values of individuals, groups of phylogenetically related species generally showed a high degree of overlap within each group. 5. Given the degree of isotope overlap in this species-rich community, coexistence could be interpreted as a consequence of superabundance of food or species diversification in morphology and foraging strategies. The short range of trophic level makes these seabirds vulnerable to the reduction of fish stocks due either to commercial fishing or stochastic fluctuations.
Fil: Forero, Manuela G.. Instituto Mediterráneo de Estudios Avanzados; España. Estación Biológica de Doñana; España
Fil: Bortolotti, Gary R.. University Of Saskatchewan; Canadá
Fil: Hobson, Keith A.. University Of Saskatchewan; Canadá
Fil: Donazar, Jose A.. Estación Biológica de Doñana; España
Fil: Bertellotti, Néstor Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: Blanco, Guillermo. Instituto de Investigación en Recursos Cinegéticos; España
description 1. Food web interactions in animal communities can be investigated through the measurement of stable isotopes (e.g. δ15N, δ13C). We used this approach in a community of 14 species of seabirds breeding on the Argentinean Patagonian coast. Tissue samples were collected from nestling and adult seabirds, as well as prey, during three consecutive breeding seasons in 28 breeding colonies. 2. Relative to those in other temperate and polar regions, this seabird community showed a high degree of overlap in trophic level (TL) among species (93% of species within a TL range of 0·7) and also a comparatively high mean trophic level (4·1). 3. Relative positions of seabirds in relation to prey suggest that most species feed on pelagic fish and to a lesser extent on invertebrates. Stable isotope values of specialist feeders, Olrolg’s (Larus atlanticus) and dolphin gulls (Leucophaeus scoresbii), which were previously assumed to feed mainly on crabs and sea lion excrement, respectively, suggested a broader diet than expected. 4. Based on stable isotope values of individuals, groups of phylogenetically related species generally showed a high degree of overlap within each group. 5. Given the degree of isotope overlap in this species-rich community, coexistence could be interpreted as a consequence of superabundance of food or species diversification in morphology and foraging strategies. The short range of trophic level makes these seabirds vulnerable to the reduction of fish stocks due either to commercial fishing or stochastic fluctuations.
publishDate 2004
dc.date.none.fl_str_mv 2004-06-26
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/29001
Forero, Manuela G.; Bortolotti, Gary R.; Hobson, Keith A.; Donazar, Jose A.; Bertellotti, Néstor Marcelo; et al.; High trophic overlap within the seabird community of Argentinean Patagonia: a multiscale approach; Wiley; Journal Of Animal Ecology; 73; 4; 26-6-2004; 789-801
0021-8790
CONICET Digital
CONICET
url http://hdl.handle.net/11336/29001
identifier_str_mv Forero, Manuela G.; Bortolotti, Gary R.; Hobson, Keith A.; Donazar, Jose A.; Bertellotti, Néstor Marcelo; et al.; High trophic overlap within the seabird community of Argentinean Patagonia: a multiscale approach; Wiley; Journal Of Animal Ecology; 73; 4; 26-6-2004; 789-801
0021-8790
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1111/j.0021-8790.2004.00852.x
info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1111/j.0021-8790.2004.00852.x/abstract
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Wiley
publisher.none.fl_str_mv Wiley
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 12.891075

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