Habitat occupancy of the Dusky-legged Guan in the lower delta of the Paraná River, Argentina

Autores
Malzof, Silvina L.; Bolkovic, Maria L.; Thompson, Jeffrey J.; Quintana, Ruben Dario
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Summary The Dusky-legged Guan Penelope obscura is the southernmost species of the family Cracidae, reaching its southern distributional limit in the delta of the Paraná River. Habitat loss, together with uncontrolled harvest, has led to local-scale decreases or extirpation of the species, but no quantitative evaluation of habitat preferences has been made. We surveyed Dusky-legged Guans in the Delta del Paraná Biosphere Reserve, Argentina, by motorboat along 543.9 km of nine waterways during both January and July 2009 and used occupancy modelling to estimate habitat and seasonal effects on occupancy. Detectability was 21-22% on average and occupancy estimates were highly variable within habitats, but highest in secondary forest, followed by mature plantation, and lowest in occupied residences. There were no significant differences in occupancy or detectability among habitats or seasonally. There was a strong positive effect of length of riparian habitat segments on occupancy and detectability. Habitat management efforts should address increasing the suitability of mature plantation forest for guans by increasing their similarity to native forest in structure and composition. Furthermore, we illustrate that surveys by boat can be logistically effective for surveying cracids associated with riverine habitats and that it is important to account for incomplete detectability since in our case failing to do so would have underestimated occupancy by 78-79% on average. Given this, the use of commonly accepted methodologies for surveying cracids that do not account for incomplete detectability should be reconsidered and methodologies that can produce robust, reliable estimates applied. Copyright © BirdLife International 2012.
Fil: Malzof, Silvina L.. Universidad de Buenos Aires; Argentina
Fil: Bolkovic, Maria L.. Secretaría de Ambiente y Desarrollo Sustentable de la Nación; Argentina
Fil: Thompson, Jeffrey J.. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación de Recursos Naturales; Argentina
Fil: Quintana, Ruben Dario. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires; Argentina
Materia
Argentina
Cracidae
Galliformes
habitat use
occupancy
Paraná River Delta
Penelope obscura
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:11336/77794
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Habitat occupancy of the Dusky-legged Guan in the lower delta of the Paraná River, ArgentinaMalzof, Silvina L.Bolkovic, Maria L.Thompson, Jeffrey J.Quintana, Ruben DarioArgentinaCracidaeGalliformeshabitat useoccupancyParaná River DeltaPenelope obscurahttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Summary The Dusky-legged Guan Penelope obscura is the southernmost species of the family Cracidae, reaching its southern distributional limit in the delta of the Paraná River. Habitat loss, together with uncontrolled harvest, has led to local-scale decreases or extirpation of the species, but no quantitative evaluation of habitat preferences has been made. We surveyed Dusky-legged Guans in the Delta del Paraná Biosphere Reserve, Argentina, by motorboat along 543.9 km of nine waterways during both January and July 2009 and used occupancy modelling to estimate habitat and seasonal effects on occupancy. Detectability was 21-22% on average and occupancy estimates were highly variable within habitats, but highest in secondary forest, followed by mature plantation, and lowest in occupied residences. There were no significant differences in occupancy or detectability among habitats or seasonally. There was a strong positive effect of length of riparian habitat segments on occupancy and detectability. Habitat management efforts should address increasing the suitability of mature plantation forest for guans by increasing their similarity to native forest in structure and composition. Furthermore, we illustrate that surveys by boat can be logistically effective for surveying cracids associated with riverine habitats and that it is important to account for incomplete detectability since in our case failing to do so would have underestimated occupancy by 78-79% on average. Given this, the use of commonly accepted methodologies for surveying cracids that do not account for incomplete detectability should be reconsidered and methodologies that can produce robust, reliable estimates applied. Copyright © BirdLife International 2012.Fil: Malzof, Silvina L.. Universidad de Buenos Aires; ArgentinaFil: Bolkovic, Maria L.. Secretaría de Ambiente y Desarrollo Sustentable de la Nación; ArgentinaFil: Thompson, Jeffrey J.. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación de Recursos Naturales; ArgentinaFil: Quintana, Ruben Dario. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires; ArgentinaCambridge University Press2013-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/77794Malzof, Silvina L.; Bolkovic, Maria L.; Thompson, Jeffrey J.; Quintana, Ruben Dario; Habitat occupancy of the Dusky-legged Guan in the lower delta of the Paraná River, Argentina; Cambridge University Press; Bird Conservation International; 23; 1; 3-2013; 83-900959-2709CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1017/S0959270912000160info:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/journals/bird-conservation-international/article/habitat-occupancy-of-the-duskylegged-guan-in-the-lower-delta-of-the-parana-river-argentina/9A730F977605CCB4C4FAD56B7B83F49Dinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:40:18Zoai:ri.conicet.gov.ar:11336/77794instacron: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:34982025-10-22 11:40:18.449CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Habitat occupancy of the Dusky-legged Guan in the lower delta of the Paraná River, Argentina
title Habitat occupancy of the Dusky-legged Guan in the lower delta of the Paraná River, Argentina
spellingShingle Habitat occupancy of the Dusky-legged Guan in the lower delta of the Paraná River, Argentina
Malzof, Silvina L.
Argentina
Cracidae
Galliformes
habitat use
occupancy
Paraná River Delta
Penelope obscura
title_short Habitat occupancy of the Dusky-legged Guan in the lower delta of the Paraná River, Argentina
title_full Habitat occupancy of the Dusky-legged Guan in the lower delta of the Paraná River, Argentina
title_fullStr Habitat occupancy of the Dusky-legged Guan in the lower delta of the Paraná River, Argentina
title_full_unstemmed Habitat occupancy of the Dusky-legged Guan in the lower delta of the Paraná River, Argentina
title_sort Habitat occupancy of the Dusky-legged Guan in the lower delta of the Paraná River, Argentina
dc.creator.none.fl_str_mv Malzof, Silvina L.
Bolkovic, Maria L.
Thompson, Jeffrey J.
Quintana, Ruben Dario
author Malzof, Silvina L.
author_facet Malzof, Silvina L.
Bolkovic, Maria L.
Thompson, Jeffrey J.
Quintana, Ruben Dario
author_role author
author2 Bolkovic, Maria L.
Thompson, Jeffrey J.
Quintana, Ruben Dario
author2_role author
author
author
dc.subject.none.fl_str_mv Argentina
Cracidae
Galliformes
habitat use
occupancy
Paraná River Delta
Penelope obscura
topic Argentina
Cracidae
Galliformes
habitat use
occupancy
Paraná River Delta
Penelope obscura
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Summary The Dusky-legged Guan Penelope obscura is the southernmost species of the family Cracidae, reaching its southern distributional limit in the delta of the Paraná River. Habitat loss, together with uncontrolled harvest, has led to local-scale decreases or extirpation of the species, but no quantitative evaluation of habitat preferences has been made. We surveyed Dusky-legged Guans in the Delta del Paraná Biosphere Reserve, Argentina, by motorboat along 543.9 km of nine waterways during both January and July 2009 and used occupancy modelling to estimate habitat and seasonal effects on occupancy. Detectability was 21-22% on average and occupancy estimates were highly variable within habitats, but highest in secondary forest, followed by mature plantation, and lowest in occupied residences. There were no significant differences in occupancy or detectability among habitats or seasonally. There was a strong positive effect of length of riparian habitat segments on occupancy and detectability. Habitat management efforts should address increasing the suitability of mature plantation forest for guans by increasing their similarity to native forest in structure and composition. Furthermore, we illustrate that surveys by boat can be logistically effective for surveying cracids associated with riverine habitats and that it is important to account for incomplete detectability since in our case failing to do so would have underestimated occupancy by 78-79% on average. Given this, the use of commonly accepted methodologies for surveying cracids that do not account for incomplete detectability should be reconsidered and methodologies that can produce robust, reliable estimates applied. Copyright © BirdLife International 2012.
Fil: Malzof, Silvina L.. Universidad de Buenos Aires; Argentina
Fil: Bolkovic, Maria L.. Secretaría de Ambiente y Desarrollo Sustentable de la Nación; Argentina
Fil: Thompson, Jeffrey J.. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación de Recursos Naturales; Argentina
Fil: Quintana, Ruben Dario. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires; Argentina
description Summary The Dusky-legged Guan Penelope obscura is the southernmost species of the family Cracidae, reaching its southern distributional limit in the delta of the Paraná River. Habitat loss, together with uncontrolled harvest, has led to local-scale decreases or extirpation of the species, but no quantitative evaluation of habitat preferences has been made. We surveyed Dusky-legged Guans in the Delta del Paraná Biosphere Reserve, Argentina, by motorboat along 543.9 km of nine waterways during both January and July 2009 and used occupancy modelling to estimate habitat and seasonal effects on occupancy. Detectability was 21-22% on average and occupancy estimates were highly variable within habitats, but highest in secondary forest, followed by mature plantation, and lowest in occupied residences. There were no significant differences in occupancy or detectability among habitats or seasonally. There was a strong positive effect of length of riparian habitat segments on occupancy and detectability. Habitat management efforts should address increasing the suitability of mature plantation forest for guans by increasing their similarity to native forest in structure and composition. Furthermore, we illustrate that surveys by boat can be logistically effective for surveying cracids associated with riverine habitats and that it is important to account for incomplete detectability since in our case failing to do so would have underestimated occupancy by 78-79% on average. Given this, the use of commonly accepted methodologies for surveying cracids that do not account for incomplete detectability should be reconsidered and methodologies that can produce robust, reliable estimates applied. Copyright © BirdLife International 2012.
publishDate 2013
dc.date.none.fl_str_mv 2013-03
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/11336/77794
Malzof, Silvina L.; Bolkovic, Maria L.; Thompson, Jeffrey J.; Quintana, Ruben Dario; Habitat occupancy of the Dusky-legged Guan in the lower delta of the Paraná River, Argentina; Cambridge University Press; Bird Conservation International; 23; 1; 3-2013; 83-90
0959-2709
CONICET Digital
CONICET
url http://hdl.handle.net/11336/77794
identifier_str_mv Malzof, Silvina L.; Bolkovic, Maria L.; Thompson, Jeffrey J.; Quintana, Ruben Dario; Habitat occupancy of the Dusky-legged Guan in the lower delta of the Paraná River, Argentina; Cambridge University Press; Bird Conservation International; 23; 1; 3-2013; 83-90
0959-2709
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1017/S0959270912000160
info:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/journals/bird-conservation-international/article/habitat-occupancy-of-the-duskylegged-guan-in-the-lower-delta-of-the-parana-river-argentina/9A730F977605CCB4C4FAD56B7B83F49D
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 Cambridge University Press
publisher.none.fl_str_mv Cambridge University Press
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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