Close Relatives, Different Niches: Urban Ecology of Two Range-Expanding Thrushes Recently Meeting in the Argentinian Pampas

Autores
Vazquez, Miriam Soledad; Scorolli, Alberto Luis; Zalba, Sergio Martín
Año de publicación
2025
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Urbanization reshapes bird communities by filtering species according to their ecologicaltraits, often reducing richness, altering relative abundances, and favoring a subset offunctionally tolerant species that dominate urban assemblages. Some native taxa are ableto inhabit cities, even using them as stepping stones for range expansion. We examinedurban habitat use, microhabitat selection, and potential niche partitioning between tworange-expanding thrushes (Austral Thrush [Turdus falcklandii] and Rufous-bellied Thrush[Turdus rufiventris]) in two urban settlements in the Pampas region, Argentina. Using131 transects across green areas and urbanized zones, we related abundance patterns tohabitat features at the transect scale and evaluated microhabitat selection at the individuallevel. Austral Thrush abundance increased with herbaceous cover, tree cover, and evenconcrete surfaces, suggesting a relatively high tolerance to fragmented green spaces withindense urban matrices. In contrast, Rufous-bellied Thrush showed a positive associationwith tree cover, avoided tall buildings, and reached higher abundance in the smaller city,consistent with its recent arrival in the region and preference for less intensively urbanizedenvironments. Microhabitat data revealed marked vertical stratification: Austral Thrushforaged almost exclusively at ground level on grassy or bare substrates, while RufousbelliedThrush used trees, shrubs, and vines more frequently. These differences reflectfine-scale resource partitioning that may contribute to reducing niche overlap and favorthe coexistence of both species in recently colonized urban areas, while recognizing thatsuch dynamics occur within broader bird assemblages where multiple species interact andcompete for space and resources. Our findings highlight that even closely related species can respond divergently to urban structure, and that maintaining structural and substrateheterogeneity within cities may help support native bird diversity.
Fil: Vazquez, Miriam Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina. Universidad Nacional del Sur. Departamento de Biología, Bioquímica y Farmacia. Grupo de Estudios en Conservación y Manejo; Argentina
Fil: Scorolli, Alberto Luis. Universidad Nacional del Sur. Departamento de Biología, Bioquímica y Farmacia. Grupo de Estudios en Conservación y Manejo; Argentina
Fil: Zalba, Sergio Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina. Universidad Nacional del Sur. Departamento de Biología, Bioquímica y Farmacia. Grupo de Estudios en Conservación y Manejo; Argentina
Materia
Coexistence
Habitat heterogeneity
Habitat selection
Microhabitat use
Native birds
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/281915
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Close Relatives, Different Niches: Urban Ecology of Two Range-Expanding Thrushes Recently Meeting in the Argentinian PampasVazquez, Miriam SoledadScorolli, Alberto LuisZalba, Sergio MartínCoexistenceHabitat heterogeneityHabitat selectionMicrohabitat useNative birdshttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Urbanization reshapes bird communities by filtering species according to their ecologicaltraits, often reducing richness, altering relative abundances, and favoring a subset offunctionally tolerant species that dominate urban assemblages. Some native taxa are ableto inhabit cities, even using them as stepping stones for range expansion. We examinedurban habitat use, microhabitat selection, and potential niche partitioning between tworange-expanding thrushes (Austral Thrush [Turdus falcklandii] and Rufous-bellied Thrush[Turdus rufiventris]) in two urban settlements in the Pampas region, Argentina. Using131 transects across green areas and urbanized zones, we related abundance patterns tohabitat features at the transect scale and evaluated microhabitat selection at the individuallevel. Austral Thrush abundance increased with herbaceous cover, tree cover, and evenconcrete surfaces, suggesting a relatively high tolerance to fragmented green spaces withindense urban matrices. In contrast, Rufous-bellied Thrush showed a positive associationwith tree cover, avoided tall buildings, and reached higher abundance in the smaller city,consistent with its recent arrival in the region and preference for less intensively urbanizedenvironments. Microhabitat data revealed marked vertical stratification: Austral Thrushforaged almost exclusively at ground level on grassy or bare substrates, while RufousbelliedThrush used trees, shrubs, and vines more frequently. These differences reflectfine-scale resource partitioning that may contribute to reducing niche overlap and favorthe coexistence of both species in recently colonized urban areas, while recognizing thatsuch dynamics occur within broader bird assemblages where multiple species interact andcompete for space and resources. Our findings highlight that even closely related species can respond divergently to urban structure, and that maintaining structural and substrateheterogeneity within cities may help support native bird diversity.Fil: Vazquez, Miriam Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina. Universidad Nacional del Sur. Departamento de Biología, Bioquímica y Farmacia. Grupo de Estudios en Conservación y Manejo; ArgentinaFil: Scorolli, Alberto Luis. Universidad Nacional del Sur. Departamento de Biología, Bioquímica y Farmacia. Grupo de Estudios en Conservación y Manejo; ArgentinaFil: Zalba, Sergio Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina. Universidad Nacional del Sur. Departamento de Biología, Bioquímica y Farmacia. Grupo de Estudios en Conservación y Manejo; ArgentinaMultidisciplinary Digital Publishing Institute2025-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/281915Vazquez, Miriam Soledad; Scorolli, Alberto Luis; Zalba, Sergio Martín; Close Relatives, Different Niches: Urban Ecology of Two Range-Expanding Thrushes Recently Meeting in the Argentinian Pampas; Multidisciplinary Digital Publishing Institute; Birds; 6; 4; 10-2025; 1-192673-6004CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.mdpi.com/2673-6004/6/4/55info:eu-repo/semantics/altIdentifier/doi/10.3390/birds6040055info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2026-04-08T11:26:46Zoai:ri.conicet.gov.ar:11336/281915instacron: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:34982026-04-08 11:26:46.783CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Close Relatives, Different Niches: Urban Ecology of Two Range-Expanding Thrushes Recently Meeting in the Argentinian Pampas
title Close Relatives, Different Niches: Urban Ecology of Two Range-Expanding Thrushes Recently Meeting in the Argentinian Pampas
spellingShingle Close Relatives, Different Niches: Urban Ecology of Two Range-Expanding Thrushes Recently Meeting in the Argentinian Pampas
Vazquez, Miriam Soledad
Coexistence
Habitat heterogeneity
Habitat selection
Microhabitat use
Native birds
title_short Close Relatives, Different Niches: Urban Ecology of Two Range-Expanding Thrushes Recently Meeting in the Argentinian Pampas
title_full Close Relatives, Different Niches: Urban Ecology of Two Range-Expanding Thrushes Recently Meeting in the Argentinian Pampas
title_fullStr Close Relatives, Different Niches: Urban Ecology of Two Range-Expanding Thrushes Recently Meeting in the Argentinian Pampas
title_full_unstemmed Close Relatives, Different Niches: Urban Ecology of Two Range-Expanding Thrushes Recently Meeting in the Argentinian Pampas
title_sort Close Relatives, Different Niches: Urban Ecology of Two Range-Expanding Thrushes Recently Meeting in the Argentinian Pampas
dc.creator.none.fl_str_mv Vazquez, Miriam Soledad
Scorolli, Alberto Luis
Zalba, Sergio Martín
author Vazquez, Miriam Soledad
author_facet Vazquez, Miriam Soledad
Scorolli, Alberto Luis
Zalba, Sergio Martín
author_role author
author2 Scorolli, Alberto Luis
Zalba, Sergio Martín
author2_role author
author
dc.subject.none.fl_str_mv Coexistence
Habitat heterogeneity
Habitat selection
Microhabitat use
Native birds
topic Coexistence
Habitat heterogeneity
Habitat selection
Microhabitat use
Native birds
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Urbanization reshapes bird communities by filtering species according to their ecologicaltraits, often reducing richness, altering relative abundances, and favoring a subset offunctionally tolerant species that dominate urban assemblages. Some native taxa are ableto inhabit cities, even using them as stepping stones for range expansion. We examinedurban habitat use, microhabitat selection, and potential niche partitioning between tworange-expanding thrushes (Austral Thrush [Turdus falcklandii] and Rufous-bellied Thrush[Turdus rufiventris]) in two urban settlements in the Pampas region, Argentina. Using131 transects across green areas and urbanized zones, we related abundance patterns tohabitat features at the transect scale and evaluated microhabitat selection at the individuallevel. Austral Thrush abundance increased with herbaceous cover, tree cover, and evenconcrete surfaces, suggesting a relatively high tolerance to fragmented green spaces withindense urban matrices. In contrast, Rufous-bellied Thrush showed a positive associationwith tree cover, avoided tall buildings, and reached higher abundance in the smaller city,consistent with its recent arrival in the region and preference for less intensively urbanizedenvironments. Microhabitat data revealed marked vertical stratification: Austral Thrushforaged almost exclusively at ground level on grassy or bare substrates, while RufousbelliedThrush used trees, shrubs, and vines more frequently. These differences reflectfine-scale resource partitioning that may contribute to reducing niche overlap and favorthe coexistence of both species in recently colonized urban areas, while recognizing thatsuch dynamics occur within broader bird assemblages where multiple species interact andcompete for space and resources. Our findings highlight that even closely related species can respond divergently to urban structure, and that maintaining structural and substrateheterogeneity within cities may help support native bird diversity.
Fil: Vazquez, Miriam Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina. Universidad Nacional del Sur. Departamento de Biología, Bioquímica y Farmacia. Grupo de Estudios en Conservación y Manejo; Argentina
Fil: Scorolli, Alberto Luis. Universidad Nacional del Sur. Departamento de Biología, Bioquímica y Farmacia. Grupo de Estudios en Conservación y Manejo; Argentina
Fil: Zalba, Sergio Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina. Universidad Nacional del Sur. Departamento de Biología, Bioquímica y Farmacia. Grupo de Estudios en Conservación y Manejo; Argentina
description Urbanization reshapes bird communities by filtering species according to their ecologicaltraits, often reducing richness, altering relative abundances, and favoring a subset offunctionally tolerant species that dominate urban assemblages. Some native taxa are ableto inhabit cities, even using them as stepping stones for range expansion. We examinedurban habitat use, microhabitat selection, and potential niche partitioning between tworange-expanding thrushes (Austral Thrush [Turdus falcklandii] and Rufous-bellied Thrush[Turdus rufiventris]) in two urban settlements in the Pampas region, Argentina. Using131 transects across green areas and urbanized zones, we related abundance patterns tohabitat features at the transect scale and evaluated microhabitat selection at the individuallevel. Austral Thrush abundance increased with herbaceous cover, tree cover, and evenconcrete surfaces, suggesting a relatively high tolerance to fragmented green spaces withindense urban matrices. In contrast, Rufous-bellied Thrush showed a positive associationwith tree cover, avoided tall buildings, and reached higher abundance in the smaller city,consistent with its recent arrival in the region and preference for less intensively urbanizedenvironments. Microhabitat data revealed marked vertical stratification: Austral Thrushforaged almost exclusively at ground level on grassy or bare substrates, while RufousbelliedThrush used trees, shrubs, and vines more frequently. These differences reflectfine-scale resource partitioning that may contribute to reducing niche overlap and favorthe coexistence of both species in recently colonized urban areas, while recognizing thatsuch dynamics occur within broader bird assemblages where multiple species interact andcompete for space and resources. Our findings highlight that even closely related species can respond divergently to urban structure, and that maintaining structural and substrateheterogeneity within cities may help support native bird diversity.
publishDate 2025
dc.date.none.fl_str_mv 2025-10
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/11336/281915
Vazquez, Miriam Soledad; Scorolli, Alberto Luis; Zalba, Sergio Martín; Close Relatives, Different Niches: Urban Ecology of Two Range-Expanding Thrushes Recently Meeting in the Argentinian Pampas; Multidisciplinary Digital Publishing Institute; Birds; 6; 4; 10-2025; 1-19
2673-6004
CONICET Digital
CONICET
url http://hdl.handle.net/11336/281915
identifier_str_mv Vazquez, Miriam Soledad; Scorolli, Alberto Luis; Zalba, Sergio Martín; Close Relatives, Different Niches: Urban Ecology of Two Range-Expanding Thrushes Recently Meeting in the Argentinian Pampas; Multidisciplinary Digital Publishing Institute; Birds; 6; 4; 10-2025; 1-19
2673-6004
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.mdpi.com/2673-6004/6/4/55
info:eu-repo/semantics/altIdentifier/doi/10.3390/birds6040055
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute
publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute
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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