Demographic effects of live shearing on a guanaco population

Autores
Rey, Andrés; Novaro, Andres Jose; Sahores, Mercedes; Guichon, Maria Laura
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Live shearing of wild guanacos (Lama guanicoe) is promoted as an alternative to livestock production and a conservation tool in the Argentinean Patagonia. However, biological sustainability of guanaco shearing has not been evaluated. We studied movements, population trends, survival, and yearling recruitment of guanacos, comparing sections with and without roundups on a Patagonian sheep ranch. A total of 2900 guanaco captures occurred in 10 roundups from 2003 to 2007. We estimated guanaco density and yearling/adult ratios with line transect surveys. We evaluated if guanacos left the section with roundups through direct observation of tagged guanacos and radiotelemetry. We estimated survival rate of shorn guanacos using 1334 capture–recapture histories. Guanaco population trends in sections with and without roundups were stable throughout a normal-rainfall period and declined during the drought that followed. Roundups were followed by temporary declines in density estimates probably associated with altered guanaco behavior. Tagged guanacos were rarely observed outside the section with roundups and none of the radiocollared guanacos permanently left the section. We estimated a constant annual survival rate for shorn guanacos (82% SE = 0.01) that was independent of sex and age. Yearling proportions declined in the section with roundups 2–3 months after summer roundups. Our results suggest that, under conditions similar to those of our study (i.e. following animal welfare practices in a ranch with moderate livestock densities and sections without livestock), live shearing would not imperil wild guanacos if roundups were conducted in spring and during normal-rainfall periods.
Fil: Rey, Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina
Fil: Novaro, Andres Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina. Wildlife Conservation Society; Estados Unidos
Fil: Sahores, Mercedes. No especifíca;
Fil: Guichon, Maria Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina. Universidad Nacional de Luján. Departamento de Ciencias Básicas; Argentina
Materia
Demography
Shearing
Guanaco
Population-effects
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:11336/270907
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Demographic effects of live shearing on a guanaco populationRey, AndrésNovaro, Andres JoseSahores, MercedesGuichon, Maria LauraDemographyShearingGuanacoPopulation-effectshttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Live shearing of wild guanacos (Lama guanicoe) is promoted as an alternative to livestock production and a conservation tool in the Argentinean Patagonia. However, biological sustainability of guanaco shearing has not been evaluated. We studied movements, population trends, survival, and yearling recruitment of guanacos, comparing sections with and without roundups on a Patagonian sheep ranch. A total of 2900 guanaco captures occurred in 10 roundups from 2003 to 2007. We estimated guanaco density and yearling/adult ratios with line transect surveys. We evaluated if guanacos left the section with roundups through direct observation of tagged guanacos and radiotelemetry. We estimated survival rate of shorn guanacos using 1334 capture–recapture histories. Guanaco population trends in sections with and without roundups were stable throughout a normal-rainfall period and declined during the drought that followed. Roundups were followed by temporary declines in density estimates probably associated with altered guanaco behavior. Tagged guanacos were rarely observed outside the section with roundups and none of the radiocollared guanacos permanently left the section. We estimated a constant annual survival rate for shorn guanacos (82% SE = 0.01) that was independent of sex and age. Yearling proportions declined in the section with roundups 2–3 months after summer roundups. Our results suggest that, under conditions similar to those of our study (i.e. following animal welfare practices in a ranch with moderate livestock densities and sections without livestock), live shearing would not imperil wild guanacos if roundups were conducted in spring and during normal-rainfall periods.Fil: Rey, Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; ArgentinaFil: Novaro, Andres Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina. Wildlife Conservation Society; Estados UnidosFil: Sahores, Mercedes. No especifíca;Fil: Guichon, Maria Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina. Universidad Nacional de Luján. Departamento de Ciencias Básicas; ArgentinaElsevier Science2012-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/270907Rey, Andrés; Novaro, Andres Jose; Sahores, Mercedes; Guichon, Maria Laura; Demographic effects of live shearing on a guanaco population; Elsevier Science; Journal of Small Ruminant Research; 107; 2-3; 10-2012; 92-1000921-4488CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0921448812002271info:eu-repo/semantics/altIdentifier/doi/10.1016/j.smallrumres.2012.05.009info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T14:49:07Zoai:ri.conicet.gov.ar:11336/270907instacron: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 14:49:07.928CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Demographic effects of live shearing on a guanaco population
title Demographic effects of live shearing on a guanaco population
spellingShingle Demographic effects of live shearing on a guanaco population
Rey, Andrés
Demography
Shearing
Guanaco
Population-effects
title_short Demographic effects of live shearing on a guanaco population
title_full Demographic effects of live shearing on a guanaco population
title_fullStr Demographic effects of live shearing on a guanaco population
title_full_unstemmed Demographic effects of live shearing on a guanaco population
title_sort Demographic effects of live shearing on a guanaco population
dc.creator.none.fl_str_mv Rey, Andrés
Novaro, Andres Jose
Sahores, Mercedes
Guichon, Maria Laura
author Rey, Andrés
author_facet Rey, Andrés
Novaro, Andres Jose
Sahores, Mercedes
Guichon, Maria Laura
author_role author
author2 Novaro, Andres Jose
Sahores, Mercedes
Guichon, Maria Laura
author2_role author
author
author
dc.subject.none.fl_str_mv Demography
Shearing
Guanaco
Population-effects
topic Demography
Shearing
Guanaco
Population-effects
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Live shearing of wild guanacos (Lama guanicoe) is promoted as an alternative to livestock production and a conservation tool in the Argentinean Patagonia. However, biological sustainability of guanaco shearing has not been evaluated. We studied movements, population trends, survival, and yearling recruitment of guanacos, comparing sections with and without roundups on a Patagonian sheep ranch. A total of 2900 guanaco captures occurred in 10 roundups from 2003 to 2007. We estimated guanaco density and yearling/adult ratios with line transect surveys. We evaluated if guanacos left the section with roundups through direct observation of tagged guanacos and radiotelemetry. We estimated survival rate of shorn guanacos using 1334 capture–recapture histories. Guanaco population trends in sections with and without roundups were stable throughout a normal-rainfall period and declined during the drought that followed. Roundups were followed by temporary declines in density estimates probably associated with altered guanaco behavior. Tagged guanacos were rarely observed outside the section with roundups and none of the radiocollared guanacos permanently left the section. We estimated a constant annual survival rate for shorn guanacos (82% SE = 0.01) that was independent of sex and age. Yearling proportions declined in the section with roundups 2–3 months after summer roundups. Our results suggest that, under conditions similar to those of our study (i.e. following animal welfare practices in a ranch with moderate livestock densities and sections without livestock), live shearing would not imperil wild guanacos if roundups were conducted in spring and during normal-rainfall periods.
Fil: Rey, Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina
Fil: Novaro, Andres Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina. Wildlife Conservation Society; Estados Unidos
Fil: Sahores, Mercedes. No especifíca;
Fil: Guichon, Maria Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina. Universidad Nacional de Luján. Departamento de Ciencias Básicas; Argentina
description Live shearing of wild guanacos (Lama guanicoe) is promoted as an alternative to livestock production and a conservation tool in the Argentinean Patagonia. However, biological sustainability of guanaco shearing has not been evaluated. We studied movements, population trends, survival, and yearling recruitment of guanacos, comparing sections with and without roundups on a Patagonian sheep ranch. A total of 2900 guanaco captures occurred in 10 roundups from 2003 to 2007. We estimated guanaco density and yearling/adult ratios with line transect surveys. We evaluated if guanacos left the section with roundups through direct observation of tagged guanacos and radiotelemetry. We estimated survival rate of shorn guanacos using 1334 capture–recapture histories. Guanaco population trends in sections with and without roundups were stable throughout a normal-rainfall period and declined during the drought that followed. Roundups were followed by temporary declines in density estimates probably associated with altered guanaco behavior. Tagged guanacos were rarely observed outside the section with roundups and none of the radiocollared guanacos permanently left the section. We estimated a constant annual survival rate for shorn guanacos (82% SE = 0.01) that was independent of sex and age. Yearling proportions declined in the section with roundups 2–3 months after summer roundups. Our results suggest that, under conditions similar to those of our study (i.e. following animal welfare practices in a ranch with moderate livestock densities and sections without livestock), live shearing would not imperil wild guanacos if roundups were conducted in spring and during normal-rainfall periods.
publishDate 2012
dc.date.none.fl_str_mv 2012-10
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/11336/270907
Rey, Andrés; Novaro, Andres Jose; Sahores, Mercedes; Guichon, Maria Laura; Demographic effects of live shearing on a guanaco population; Elsevier Science; Journal of Small Ruminant Research; 107; 2-3; 10-2012; 92-100
0921-4488
CONICET Digital
CONICET
url http://hdl.handle.net/11336/270907
identifier_str_mv Rey, Andrés; Novaro, Andres Jose; Sahores, Mercedes; Guichon, Maria Laura; Demographic effects of live shearing on a guanaco population; Elsevier Science; Journal of Small Ruminant Research; 107; 2-3; 10-2012; 92-100
0921-4488
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.sciencedirect.com/science/article/abs/pii/S0921448812002271
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.smallrumres.2012.05.009
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
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
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 13.22299

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