Population structure of podocnemis expansa (Testudines: Podocnemididae) in Southern Brazilian amazon

Autores
Costa Gonçalves Portelinha, Thiago; Malvásio, Adriana; Piña, Carlos Ignacio; Bertoluci, Jaime
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Detailed studies of the population structure of most species of turtles in the Amazon Basin are lacking throughout their range. We estimated sex ratio, size structure, relative abundance, and recapture index for the Giant South American River Turtle (Podocnemis expansa) in Javaés River, southern Brazilian Amazon. Field work was conducted between 2004 and 2009, and comprised a total sampling effort of 368 hours in 92 sampling days. Turtles were captured by diving and seining. A total of 645 individuals (156 adult males, 109 adult females, and 380 juveniles) were captured and marked, but only five were recaptured. Carapace length showed a unimodal pattern for males, but no clear pattern for females. The population consisted predominantly of adult males and young females, with a sex ratio of 1.4:1 (M:F). Relative abundance varied from 0-5.5 animals/h depending on the capture method employed. Most animals (73.7%) were concentrated in a single location on the river (1 km out of 40 km sampled) during the study period. Population monitoring on a long-term basis will be necessary to identify the real population structure, evaluate poaching pressure, and to support the conservation project which has been ongoing since 1985 in the area.
Fil: Costa Gonçalves Portelinha, Thiago. Universidade Federal de Tocantins; Brasil. Provincia de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Universidad Autónoma de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción; Argentina
Fil: Malvásio, Adriana. Universidade Federal de Tocantins; Brasil
Fil: Piña, Carlos Ignacio. Provincia de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Universidad Autónoma de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción; Argentina
Fil: Bertoluci, Jaime. Universidade Do Sao Paulo. Escola Superior de Agricultura Luiz de Queiroz Esalq; Brasil
Materia
Abundance
Conservation
Giant Amazon River Turtle
Net Seining
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:11336/37041
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/37041
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Population structure of podocnemis expansa (Testudines: Podocnemididae) in Southern Brazilian amazonCosta Gonçalves Portelinha, ThiagoMalvásio, AdrianaPiña, Carlos IgnacioBertoluci, JaimeAbundanceConservationGiant Amazon River TurtleNet Seininghttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Detailed studies of the population structure of most species of turtles in the Amazon Basin are lacking throughout their range. We estimated sex ratio, size structure, relative abundance, and recapture index for the Giant South American River Turtle (Podocnemis expansa) in Javaés River, southern Brazilian Amazon. Field work was conducted between 2004 and 2009, and comprised a total sampling effort of 368 hours in 92 sampling days. Turtles were captured by diving and seining. A total of 645 individuals (156 adult males, 109 adult females, and 380 juveniles) were captured and marked, but only five were recaptured. Carapace length showed a unimodal pattern for males, but no clear pattern for females. The population consisted predominantly of adult males and young females, with a sex ratio of 1.4:1 (M:F). Relative abundance varied from 0-5.5 animals/h depending on the capture method employed. Most animals (73.7%) were concentrated in a single location on the river (1 km out of 40 km sampled) during the study period. Population monitoring on a long-term basis will be necessary to identify the real population structure, evaluate poaching pressure, and to support the conservation project which has been ongoing since 1985 in the area.Fil: Costa Gonçalves Portelinha, Thiago. Universidade Federal de Tocantins; Brasil. Provincia de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Universidad Autónoma de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción; ArgentinaFil: Malvásio, Adriana. Universidade Federal de Tocantins; BrasilFil: Piña, Carlos Ignacio. Provincia de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Universidad Autónoma de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción; ArgentinaFil: Bertoluci, Jaime. Universidade Do Sao Paulo. Escola Superior de Agricultura Luiz de Queiroz Esalq; BrasilAmer Soc Ichthyologists Herpetologists2014-12info: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/11336/37041Costa Gonçalves Portelinha, Thiago; Malvásio, Adriana; Piña, Carlos Ignacio; Bertoluci, Jaime; Population structure of podocnemis expansa (Testudines: Podocnemididae) in Southern Brazilian amazon; Amer Soc Ichthyologists Herpetologists; Copeia; 2014; 4; 12-2014; 707-7150045-8511CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1643/CE-13-058info:eu-repo/semantics/altIdentifier/url/http://www.bioone.org/doi/10.1643/CE-13-058info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:09:58Zoai:ri.conicet.gov.ar:11336/37041instacron: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 10:09:59.265CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Population structure of podocnemis expansa (Testudines: Podocnemididae) in Southern Brazilian amazon
title Population structure of podocnemis expansa (Testudines: Podocnemididae) in Southern Brazilian amazon
spellingShingle Population structure of podocnemis expansa (Testudines: Podocnemididae) in Southern Brazilian amazon
Costa Gonçalves Portelinha, Thiago
Abundance
Conservation
Giant Amazon River Turtle
Net Seining
title_short Population structure of podocnemis expansa (Testudines: Podocnemididae) in Southern Brazilian amazon
title_full Population structure of podocnemis expansa (Testudines: Podocnemididae) in Southern Brazilian amazon
title_fullStr Population structure of podocnemis expansa (Testudines: Podocnemididae) in Southern Brazilian amazon
title_full_unstemmed Population structure of podocnemis expansa (Testudines: Podocnemididae) in Southern Brazilian amazon
title_sort Population structure of podocnemis expansa (Testudines: Podocnemididae) in Southern Brazilian amazon
dc.creator.none.fl_str_mv Costa Gonçalves Portelinha, Thiago
Malvásio, Adriana
Piña, Carlos Ignacio
Bertoluci, Jaime
author Costa Gonçalves Portelinha, Thiago
author_facet Costa Gonçalves Portelinha, Thiago
Malvásio, Adriana
Piña, Carlos Ignacio
Bertoluci, Jaime
author_role author
author2 Malvásio, Adriana
Piña, Carlos Ignacio
Bertoluci, Jaime
author2_role author
author
author
dc.subject.none.fl_str_mv Abundance
Conservation
Giant Amazon River Turtle
Net Seining
topic Abundance
Conservation
Giant Amazon River Turtle
Net Seining
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Detailed studies of the population structure of most species of turtles in the Amazon Basin are lacking throughout their range. We estimated sex ratio, size structure, relative abundance, and recapture index for the Giant South American River Turtle (Podocnemis expansa) in Javaés River, southern Brazilian Amazon. Field work was conducted between 2004 and 2009, and comprised a total sampling effort of 368 hours in 92 sampling days. Turtles were captured by diving and seining. A total of 645 individuals (156 adult males, 109 adult females, and 380 juveniles) were captured and marked, but only five were recaptured. Carapace length showed a unimodal pattern for males, but no clear pattern for females. The population consisted predominantly of adult males and young females, with a sex ratio of 1.4:1 (M:F). Relative abundance varied from 0-5.5 animals/h depending on the capture method employed. Most animals (73.7%) were concentrated in a single location on the river (1 km out of 40 km sampled) during the study period. Population monitoring on a long-term basis will be necessary to identify the real population structure, evaluate poaching pressure, and to support the conservation project which has been ongoing since 1985 in the area.
Fil: Costa Gonçalves Portelinha, Thiago. Universidade Federal de Tocantins; Brasil. Provincia de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Universidad Autónoma de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción; Argentina
Fil: Malvásio, Adriana. Universidade Federal de Tocantins; Brasil
Fil: Piña, Carlos Ignacio. Provincia de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Universidad Autónoma de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción; Argentina
Fil: Bertoluci, Jaime. Universidade Do Sao Paulo. Escola Superior de Agricultura Luiz de Queiroz Esalq; Brasil
description Detailed studies of the population structure of most species of turtles in the Amazon Basin are lacking throughout their range. We estimated sex ratio, size structure, relative abundance, and recapture index for the Giant South American River Turtle (Podocnemis expansa) in Javaés River, southern Brazilian Amazon. Field work was conducted between 2004 and 2009, and comprised a total sampling effort of 368 hours in 92 sampling days. Turtles were captured by diving and seining. A total of 645 individuals (156 adult males, 109 adult females, and 380 juveniles) were captured and marked, but only five were recaptured. Carapace length showed a unimodal pattern for males, but no clear pattern for females. The population consisted predominantly of adult males and young females, with a sex ratio of 1.4:1 (M:F). Relative abundance varied from 0-5.5 animals/h depending on the capture method employed. Most animals (73.7%) were concentrated in a single location on the river (1 km out of 40 km sampled) during the study period. Population monitoring on a long-term basis will be necessary to identify the real population structure, evaluate poaching pressure, and to support the conservation project which has been ongoing since 1985 in the area.
publishDate 2014
dc.date.none.fl_str_mv 2014-12
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/11336/37041
Costa Gonçalves Portelinha, Thiago; Malvásio, Adriana; Piña, Carlos Ignacio; Bertoluci, Jaime; Population structure of podocnemis expansa (Testudines: Podocnemididae) in Southern Brazilian amazon; Amer Soc Ichthyologists Herpetologists; Copeia; 2014; 4; 12-2014; 707-715
0045-8511
CONICET Digital
CONICET
url http://hdl.handle.net/11336/37041
identifier_str_mv Costa Gonçalves Portelinha, Thiago; Malvásio, Adriana; Piña, Carlos Ignacio; Bertoluci, Jaime; Population structure of podocnemis expansa (Testudines: Podocnemididae) in Southern Brazilian amazon; Amer Soc Ichthyologists Herpetologists; Copeia; 2014; 4; 12-2014; 707-715
0045-8511
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1643/CE-13-058
info:eu-repo/semantics/altIdentifier/url/http://www.bioone.org/doi/10.1643/CE-13-058
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
dc.publisher.none.fl_str_mv Amer Soc Ichthyologists Herpetologists
publisher.none.fl_str_mv Amer Soc Ichthyologists Herpetologists
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
_version_ 1844613984483803136
score 13.070432

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