Abundance estimates of the lesser rhea Rhea pennata pennata in the Argentine Patagonia: conservation implications
- Autores
- Baldi, Ricardo; Pirronitto, Analia; Burgi, Maria Virginia; Antun, Maria de Los Milagros
- Año de publicación
- 2015
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- The southern subspecies of the lesser rhea is distributed through the Argentine Patagonia and southern Chile. Habitat-loss and poaching were identified as the main threats to lesser rhea populations by the IUCN, which classified the species as "Least concern" in 2014. Although Rhea pennata pennata is among the most conspicuous wildlife across the large Patagonian rangelands, the available estimates of abundance are scarce, mostly restricted to reports between 12 and 30 years old, and resulted from different surveying methods. Our purpose in this work was to obtain estimates of R. p. pennata abundance across different sites in the Argentine Patagonia, and to explore the main factors affecting the spatial variation in abundance. We surveyed over 4000 km of line transects across six sites and obtained abundance estimates using the Distance sampling analysis. Also, we fitted restricted mixed models to evaluate the effects of different factors on the variation in R. p. pennata encounter rates among sites. We found that the abundance of R. p. pennata was very low either in the encounter rate (taking until 113 km of survey to detect a group of rheas depending on the site) or population density (between 0.0063 and 0.28 individuals.km−2). The occurrence of sheep ranching (SH) affected negatively the variation in the abundance of R. p. pennata among sites, whereas the availability of grassland (GR) habitat increased the chance of finding groups during the surveys. Line-transect surveys following the Distance sampling procedures are adequate to estimate encounter rates, although the low number of observations requiresrepeated surveys per site to obtain reliable estimates of animal density. Extended and sustained survey efforts and the implementation of a monitoring program are crucial to assess population trends of lesser rheas. Law enforcement to control poaching, increase in public awareness and an action plan to reduce threats are all necessary steps to conserve this emblematic species in Patagonia.
Fil: Baldi, Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina. Wildlife Conservation Society; Estados Unidos
Fil: Pirronitto, Analia. Universidad Nacional de la Patagonia; Argentina
Fil: Burgi, Maria Virginia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina
Fil: Antun, Maria de Los Milagros. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina - Materia
-
RHEA PENNATA PENNATA
LESSER RHEA
ABUNDANCE ESTIMATION
SPATIAL VARIATION
PATAGONIA ARGENTINA
CONSERVATION - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/39181
Ver los metadatos del registro completo
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CONICET Digital (CONICET) |
spelling |
Abundance estimates of the lesser rhea Rhea pennata pennata in the Argentine Patagonia: conservation implicationsBaldi, RicardoPirronitto, AnaliaBurgi, Maria VirginiaAntun, Maria de Los MilagrosRHEA PENNATA PENNATALESSER RHEAABUNDANCE ESTIMATIONSPATIAL VARIATIONPATAGONIA ARGENTINACONSERVATIONhttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1https://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1The southern subspecies of the lesser rhea is distributed through the Argentine Patagonia and southern Chile. Habitat-loss and poaching were identified as the main threats to lesser rhea populations by the IUCN, which classified the species as "Least concern" in 2014. Although Rhea pennata pennata is among the most conspicuous wildlife across the large Patagonian rangelands, the available estimates of abundance are scarce, mostly restricted to reports between 12 and 30 years old, and resulted from different surveying methods. Our purpose in this work was to obtain estimates of R. p. pennata abundance across different sites in the Argentine Patagonia, and to explore the main factors affecting the spatial variation in abundance. We surveyed over 4000 km of line transects across six sites and obtained abundance estimates using the Distance sampling analysis. Also, we fitted restricted mixed models to evaluate the effects of different factors on the variation in R. p. pennata encounter rates among sites. We found that the abundance of R. p. pennata was very low either in the encounter rate (taking until 113 km of survey to detect a group of rheas depending on the site) or population density (between 0.0063 and 0.28 individuals.km−2). The occurrence of sheep ranching (SH) affected negatively the variation in the abundance of R. p. pennata among sites, whereas the availability of grassland (GR) habitat increased the chance of finding groups during the surveys. Line-transect surveys following the Distance sampling procedures are adequate to estimate encounter rates, although the low number of observations requiresrepeated surveys per site to obtain reliable estimates of animal density. Extended and sustained survey efforts and the implementation of a monitoring program are crucial to assess population trends of lesser rheas. Law enforcement to control poaching, increase in public awareness and an action plan to reduce threats are all necessary steps to conserve this emblematic species in Patagonia.Fil: Baldi, Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina. Wildlife Conservation Society; Estados UnidosFil: Pirronitto, Analia. Universidad Nacional de la Patagonia; ArgentinaFil: Burgi, Maria Virginia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; ArgentinaFil: Antun, Maria de Los Milagros. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; ArgentinaFRONTIERS IN ECOLOGY AND EVOLUTION2015-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/39181Baldi, Ricardo; Pirronitto, Analia; Burgi, Maria Virginia; Antun, Maria de Los Milagros; Abundance estimates of the lesser rhea Rhea pennata pennata in the Argentine Patagonia: conservation implications; FRONTIERS IN ECOLOGY AND EVOLUTION; FRONTIERS; 3; 135; 12-2015; 1-82296-701XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.3389/fevo.2015.00135info:eu-repo/semantics/altIdentifier/url/https://www.frontiersin.org/articles/10.3389/fevo.2015.00135/fullinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:27:49Zoai:ri.conicet.gov.ar:11336/39181instacron: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:34982025-09-29 10:27:49.953CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Abundance estimates of the lesser rhea Rhea pennata pennata in the Argentine Patagonia: conservation implications |
title |
Abundance estimates of the lesser rhea Rhea pennata pennata in the Argentine Patagonia: conservation implications |
spellingShingle |
Abundance estimates of the lesser rhea Rhea pennata pennata in the Argentine Patagonia: conservation implications Baldi, Ricardo RHEA PENNATA PENNATA LESSER RHEA ABUNDANCE ESTIMATION SPATIAL VARIATION PATAGONIA ARGENTINA CONSERVATION |
title_short |
Abundance estimates of the lesser rhea Rhea pennata pennata in the Argentine Patagonia: conservation implications |
title_full |
Abundance estimates of the lesser rhea Rhea pennata pennata in the Argentine Patagonia: conservation implications |
title_fullStr |
Abundance estimates of the lesser rhea Rhea pennata pennata in the Argentine Patagonia: conservation implications |
title_full_unstemmed |
Abundance estimates of the lesser rhea Rhea pennata pennata in the Argentine Patagonia: conservation implications |
title_sort |
Abundance estimates of the lesser rhea Rhea pennata pennata in the Argentine Patagonia: conservation implications |
dc.creator.none.fl_str_mv |
Baldi, Ricardo Pirronitto, Analia Burgi, Maria Virginia Antun, Maria de Los Milagros |
author |
Baldi, Ricardo |
author_facet |
Baldi, Ricardo Pirronitto, Analia Burgi, Maria Virginia Antun, Maria de Los Milagros |
author_role |
author |
author2 |
Pirronitto, Analia Burgi, Maria Virginia Antun, Maria de Los Milagros |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
RHEA PENNATA PENNATA LESSER RHEA ABUNDANCE ESTIMATION SPATIAL VARIATION PATAGONIA ARGENTINA CONSERVATION |
topic |
RHEA PENNATA PENNATA LESSER RHEA ABUNDANCE ESTIMATION SPATIAL VARIATION PATAGONIA ARGENTINA CONSERVATION |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
The southern subspecies of the lesser rhea is distributed through the Argentine Patagonia and southern Chile. Habitat-loss and poaching were identified as the main threats to lesser rhea populations by the IUCN, which classified the species as "Least concern" in 2014. Although Rhea pennata pennata is among the most conspicuous wildlife across the large Patagonian rangelands, the available estimates of abundance are scarce, mostly restricted to reports between 12 and 30 years old, and resulted from different surveying methods. Our purpose in this work was to obtain estimates of R. p. pennata abundance across different sites in the Argentine Patagonia, and to explore the main factors affecting the spatial variation in abundance. We surveyed over 4000 km of line transects across six sites and obtained abundance estimates using the Distance sampling analysis. Also, we fitted restricted mixed models to evaluate the effects of different factors on the variation in R. p. pennata encounter rates among sites. We found that the abundance of R. p. pennata was very low either in the encounter rate (taking until 113 km of survey to detect a group of rheas depending on the site) or population density (between 0.0063 and 0.28 individuals.km−2). The occurrence of sheep ranching (SH) affected negatively the variation in the abundance of R. p. pennata among sites, whereas the availability of grassland (GR) habitat increased the chance of finding groups during the surveys. Line-transect surveys following the Distance sampling procedures are adequate to estimate encounter rates, although the low number of observations requiresrepeated surveys per site to obtain reliable estimates of animal density. Extended and sustained survey efforts and the implementation of a monitoring program are crucial to assess population trends of lesser rheas. Law enforcement to control poaching, increase in public awareness and an action plan to reduce threats are all necessary steps to conserve this emblematic species in Patagonia. Fil: Baldi, Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina. Wildlife Conservation Society; Estados Unidos Fil: Pirronitto, Analia. Universidad Nacional de la Patagonia; Argentina Fil: Burgi, Maria Virginia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina Fil: Antun, Maria de Los Milagros. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina |
description |
The southern subspecies of the lesser rhea is distributed through the Argentine Patagonia and southern Chile. Habitat-loss and poaching were identified as the main threats to lesser rhea populations by the IUCN, which classified the species as "Least concern" in 2014. Although Rhea pennata pennata is among the most conspicuous wildlife across the large Patagonian rangelands, the available estimates of abundance are scarce, mostly restricted to reports between 12 and 30 years old, and resulted from different surveying methods. Our purpose in this work was to obtain estimates of R. p. pennata abundance across different sites in the Argentine Patagonia, and to explore the main factors affecting the spatial variation in abundance. We surveyed over 4000 km of line transects across six sites and obtained abundance estimates using the Distance sampling analysis. Also, we fitted restricted mixed models to evaluate the effects of different factors on the variation in R. p. pennata encounter rates among sites. We found that the abundance of R. p. pennata was very low either in the encounter rate (taking until 113 km of survey to detect a group of rheas depending on the site) or population density (between 0.0063 and 0.28 individuals.km−2). The occurrence of sheep ranching (SH) affected negatively the variation in the abundance of R. p. pennata among sites, whereas the availability of grassland (GR) habitat increased the chance of finding groups during the surveys. Line-transect surveys following the Distance sampling procedures are adequate to estimate encounter rates, although the low number of observations requiresrepeated surveys per site to obtain reliable estimates of animal density. Extended and sustained survey efforts and the implementation of a monitoring program are crucial to assess population trends of lesser rheas. Law enforcement to control poaching, increase in public awareness and an action plan to reduce threats are all necessary steps to conserve this emblematic species in Patagonia. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-12 |
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/11336/39181 Baldi, Ricardo; Pirronitto, Analia; Burgi, Maria Virginia; Antun, Maria de Los Milagros; Abundance estimates of the lesser rhea Rhea pennata pennata in the Argentine Patagonia: conservation implications; FRONTIERS IN ECOLOGY AND EVOLUTION; FRONTIERS; 3; 135; 12-2015; 1-8 2296-701X CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/39181 |
identifier_str_mv |
Baldi, Ricardo; Pirronitto, Analia; Burgi, Maria Virginia; Antun, Maria de Los Milagros; Abundance estimates of the lesser rhea Rhea pennata pennata in the Argentine Patagonia: conservation implications; FRONTIERS IN ECOLOGY AND EVOLUTION; FRONTIERS; 3; 135; 12-2015; 1-8 2296-701X CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/doi/10.3389/fevo.2015.00135 info:eu-repo/semantics/altIdentifier/url/https://www.frontiersin.org/articles/10.3389/fevo.2015.00135/full |
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 |
FRONTIERS IN ECOLOGY AND EVOLUTION |
publisher.none.fl_str_mv |
FRONTIERS IN ECOLOGY AND EVOLUTION |
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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1844614280852275200 |
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13.070432 |