Assessment of capybara (Hydrochoerus hydrochaeris) populations in the wetlands of Corrientes, Argentina

Ten sampling sites were selected to represent six distinct habitat types used by capybaras ('clean' lagoons, 'dirty' lagoons, cutwaters, fens and marshes, gallery forests, and erosion ditches). The sites were sampled during winter (July and August); densities were expressed as nu...

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Detalles Bibliográficos
Autor principal: Quintana, Rubén Darío
Publicado: 1993
Materias:
Argentina
capybara
Corrientes
Hydrochoerus hydrochaeris
poaching
social groups
wetlands management
population structure
wetland
Argentina, Corrientes
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09234861_v2_n4_p223_Quintana
http://hdl.handle.net/20.500.12110/paper_09234861_v2_n4_p223_Quintana
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_09234861_v2_n4_p223_Quintana
record_format dspace
spelling paper:paper_09234861_v2_n4_p223_Quintana2023-06-08T15:51:01Z Assessment of capybara (Hydrochoerus hydrochaeris) populations in the wetlands of Corrientes, Argentina Quintana, Rubén Darío Argentina capybara Corrientes Hydrochoerus hydrochaeris poaching social groups wetlands management capybara population structure wetland Argentina, Corrientes Hydrochoerus hydrochaeris Ten sampling sites were selected to represent six distinct habitat types used by capybaras ('clean' lagoons, 'dirty' lagoons, cutwaters, fens and marshes, gallery forests, and erosion ditches). The sites were sampled during winter (July and August); densities were expressed as number of capybaras per linear km of shoreline (C/LKS). The sites were classified as protected from poachers (P), under light hunting pressure (LHP), and under heavy hunting pressure (HHP). 'Clean' protected (P) lagoons had three times as many capybaras as LHP ones (30.7 and 10.9 C/LKS, respectively), and thirty times those under HHP (1.0 C/LKS). Protected marshes and 'dirty' lagoons had even higher capybara densities (52.5 and 50.0 C/LKS, respectively). Gallery forests under LHP had low densities (6.3 C/LKS), and protected cutwaters intermediate densities (27.5 C/LKS). Erosion ditches had exceptionally high densities (900 C/LKS), probably because cattle were fenced out, reducing forage competition. These densities, when converted to the standard unit area measurement (individuals/ha), were similar to those obtained by other researchers in the Brazilian Pantanal, and somewhat smaller than those in the Venezuelan Llanos. Mean number of capybaras per group remained relatively constant in all habitats (averages ranged between 9.2 and 11.8 individuals/group) but its coefficient of variation was much higher in LHP sites, probably because social structure was altered severely by hunting. The overall ratio of young to adults and juveniles was 1:7.4. In one of the sites, 13 of 34 groups (38.2%) were with young (average of 17 capybaras per group, 4.7 of which were young), confirming that this species can reproduce all year long. © 1993 SPB Academic Publishing bv. Fil:Quintana, R.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1993 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09234861_v2_n4_p223_Quintana http://hdl.handle.net/20.500.12110/paper_09234861_v2_n4_p223_Quintana
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Argentina
capybara
Corrientes
Hydrochoerus hydrochaeris
poaching
social groups
wetlands management
capybara
population structure
wetland
Argentina, Corrientes
Hydrochoerus hydrochaeris
spellingShingle Argentina
capybara
Corrientes
Hydrochoerus hydrochaeris
poaching
social groups
wetlands management
capybara
population structure
wetland
Argentina, Corrientes
Hydrochoerus hydrochaeris
Quintana, Rubén Darío
Assessment of capybara (Hydrochoerus hydrochaeris) populations in the wetlands of Corrientes, Argentina
topic_facet Argentina
capybara
Corrientes
Hydrochoerus hydrochaeris
poaching
social groups
wetlands management
capybara
population structure
wetland
Argentina, Corrientes
Hydrochoerus hydrochaeris
description Ten sampling sites were selected to represent six distinct habitat types used by capybaras ('clean' lagoons, 'dirty' lagoons, cutwaters, fens and marshes, gallery forests, and erosion ditches). The sites were sampled during winter (July and August); densities were expressed as number of capybaras per linear km of shoreline (C/LKS). The sites were classified as protected from poachers (P), under light hunting pressure (LHP), and under heavy hunting pressure (HHP). 'Clean' protected (P) lagoons had three times as many capybaras as LHP ones (30.7 and 10.9 C/LKS, respectively), and thirty times those under HHP (1.0 C/LKS). Protected marshes and 'dirty' lagoons had even higher capybara densities (52.5 and 50.0 C/LKS, respectively). Gallery forests under LHP had low densities (6.3 C/LKS), and protected cutwaters intermediate densities (27.5 C/LKS). Erosion ditches had exceptionally high densities (900 C/LKS), probably because cattle were fenced out, reducing forage competition. These densities, when converted to the standard unit area measurement (individuals/ha), were similar to those obtained by other researchers in the Brazilian Pantanal, and somewhat smaller than those in the Venezuelan Llanos. Mean number of capybaras per group remained relatively constant in all habitats (averages ranged between 9.2 and 11.8 individuals/group) but its coefficient of variation was much higher in LHP sites, probably because social structure was altered severely by hunting. The overall ratio of young to adults and juveniles was 1:7.4. In one of the sites, 13 of 34 groups (38.2%) were with young (average of 17 capybaras per group, 4.7 of which were young), confirming that this species can reproduce all year long. © 1993 SPB Academic Publishing bv.
author Quintana, Rubén Darío
author_facet Quintana, Rubén Darío
author_sort Quintana, Rubén Darío
title Assessment of capybara (Hydrochoerus hydrochaeris) populations in the wetlands of Corrientes, Argentina
title_short Assessment of capybara (Hydrochoerus hydrochaeris) populations in the wetlands of Corrientes, Argentina
title_full Assessment of capybara (Hydrochoerus hydrochaeris) populations in the wetlands of Corrientes, Argentina
title_fullStr Assessment of capybara (Hydrochoerus hydrochaeris) populations in the wetlands of Corrientes, Argentina
title_full_unstemmed Assessment of capybara (Hydrochoerus hydrochaeris) populations in the wetlands of Corrientes, Argentina
title_sort assessment of capybara (hydrochoerus hydrochaeris) populations in the wetlands of corrientes, argentina
publishDate 1993
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09234861_v2_n4_p223_Quintana
http://hdl.handle.net/20.500.12110/paper_09234861_v2_n4_p223_Quintana
work_keys_str_mv AT quintanarubendario assessmentofcapybarahydrochoerushydrochaerispopulationsinthewetlandsofcorrientesargentina
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