Dinámica estacional de la ictiofauna de Laguna Alsina, provincia de Buenos Aaires, Argentina

Autores
Schwerdt, Marcelo Gabriel; López Cazorla, Andrea Cecilia
Año de publicación
2009
Idioma
español castellano
Tipo de recurso
artículo
Estado
versión publicada
Descripción
This study aims at characterizing the seasonal dynamics of the ichtyofauna of Alsina lagoon which belongs to the Encadenadas del Oeste (Province of Buenos Aires, Argentina). Fish sampling was performed on a three-month basis, from April 2007 to March 2008, using gill nets and a trawl net. Diversity (H’) and species richness were calculated for every sampling station and for each season. Differences in H´ values were analyzed via ANOVA. Relative abundance in number was estimated with net mesh capture. Capture per unit effort (CPUE) was calculated considering the fishing night as unit effort and the size structure of the dominant species was described. A total of 8643 individuals belonging to 14 species were captured. Species richness varied from 8 to 11. H´ evidenced no significant differences among places (p=0.15) although differences were recorded all over the year (p=0.001). H´ was highest in autumn (2.23) and lowest in spring (0.96). In autumn, the dominant species were Odontesthes bonariensis (34%), Parapimelodus valenciennis (32%) and Oligosarcus jenynsii (28%). In winter, the dominant species were only O. bonariensis and O. jenynsii, both representing more than 90%. A significant increase in CPUE was observed in pejerrey (O. bonariensis). Dominant size ranges were 15-17 and 20-25 cm Lst in O. bonariensis and 17-23 cm Lst in O. jenynsii. It can thus be concluded that Alsina lagoon has a key role as a biodiversity reservoir of continental waters. The ichthyc community has undergone modifications, of which the most relevant include: disappearance of P. valenciennis and increase of O. bonariensis. The recuperation of O. bonariensis stock therefore guarantees a promissing future for this environment which formerly reached highest productivity in Encadenadas del Oeste system.
Instituto de Limnología "Raúl A. Ringuelet"
Materia
Ciencias Naturales
dinámica
Laguna Alsina (Buenos Aires, Argentina)
ictiofauna
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-nd/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/68794

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network_name_str SEDICI (UNLP)
spelling Dinámica estacional de la ictiofauna de Laguna Alsina, provincia de Buenos Aaires, ArgentinaSchwerdt, Marcelo GabrielLópez Cazorla, Andrea CeciliaCiencias NaturalesdinámicaLaguna Alsina (Buenos Aires, Argentina)ictiofaunaThis study aims at characterizing the seasonal dynamics of the ichtyofauna of Alsina lagoon which belongs to the Encadenadas del Oeste (Province of Buenos Aires, Argentina). Fish sampling was performed on a three-month basis, from April 2007 to March 2008, using gill nets and a trawl net. Diversity (H’) and species richness were calculated for every sampling station and for each season. Differences in H´ values were analyzed via ANOVA. Relative abundance in number was estimated with net mesh capture. Capture per unit effort (CPUE) was calculated considering the fishing night as unit effort and the size structure of the dominant species was described. A total of 8643 individuals belonging to 14 species were captured. Species richness varied from 8 to 11. H´ evidenced no significant differences among places (p=0.15) although differences were recorded all over the year (p=0.001). H´ was highest in autumn (2.23) and lowest in spring (0.96). In autumn, the dominant species were Odontesthes bonariensis (34%), Parapimelodus valenciennis (32%) and Oligosarcus jenynsii (28%). In winter, the dominant species were only O. bonariensis and O. jenynsii, both representing more than 90%. A significant increase in CPUE was observed in pejerrey (O. bonariensis). Dominant size ranges were 15-17 and 20-25 cm Lst in O. bonariensis and 17-23 cm Lst in O. jenynsii. It can thus be concluded that Alsina lagoon has a key role as a biodiversity reservoir of continental waters. The ichthyc community has undergone modifications, of which the most relevant include: disappearance of P. valenciennis and increase of O. bonariensis. The recuperation of O. bonariensis stock therefore guarantees a promissing future for this environment which formerly reached highest productivity in Encadenadas del Oeste system.Instituto de Limnología "Raúl A. Ringuelet"2009info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf209-215http://sedici.unlp.edu.ar/handle/10915/68794spainfo:eu-repo/semantics/altIdentifier/issn/0326-1638info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/4.0/Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-03T10:42:44Zoai:sedici.unlp.edu.ar:10915/68794Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-03 10:42:44.665SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Dinámica estacional de la ictiofauna de Laguna Alsina, provincia de Buenos Aaires, Argentina
title Dinámica estacional de la ictiofauna de Laguna Alsina, provincia de Buenos Aaires, Argentina
spellingShingle Dinámica estacional de la ictiofauna de Laguna Alsina, provincia de Buenos Aaires, Argentina
Schwerdt, Marcelo Gabriel
Ciencias Naturales
dinámica
Laguna Alsina (Buenos Aires, Argentina)
ictiofauna
title_short Dinámica estacional de la ictiofauna de Laguna Alsina, provincia de Buenos Aaires, Argentina
title_full Dinámica estacional de la ictiofauna de Laguna Alsina, provincia de Buenos Aaires, Argentina
title_fullStr Dinámica estacional de la ictiofauna de Laguna Alsina, provincia de Buenos Aaires, Argentina
title_full_unstemmed Dinámica estacional de la ictiofauna de Laguna Alsina, provincia de Buenos Aaires, Argentina
title_sort Dinámica estacional de la ictiofauna de Laguna Alsina, provincia de Buenos Aaires, Argentina
dc.creator.none.fl_str_mv Schwerdt, Marcelo Gabriel
López Cazorla, Andrea Cecilia
author Schwerdt, Marcelo Gabriel
author_facet Schwerdt, Marcelo Gabriel
López Cazorla, Andrea Cecilia
author_role author
author2 López Cazorla, Andrea Cecilia
author2_role author
dc.subject.none.fl_str_mv Ciencias Naturales
dinámica
Laguna Alsina (Buenos Aires, Argentina)
ictiofauna
topic Ciencias Naturales
dinámica
Laguna Alsina (Buenos Aires, Argentina)
ictiofauna
dc.description.none.fl_txt_mv This study aims at characterizing the seasonal dynamics of the ichtyofauna of Alsina lagoon which belongs to the Encadenadas del Oeste (Province of Buenos Aires, Argentina). Fish sampling was performed on a three-month basis, from April 2007 to March 2008, using gill nets and a trawl net. Diversity (H’) and species richness were calculated for every sampling station and for each season. Differences in H´ values were analyzed via ANOVA. Relative abundance in number was estimated with net mesh capture. Capture per unit effort (CPUE) was calculated considering the fishing night as unit effort and the size structure of the dominant species was described. A total of 8643 individuals belonging to 14 species were captured. Species richness varied from 8 to 11. H´ evidenced no significant differences among places (p=0.15) although differences were recorded all over the year (p=0.001). H´ was highest in autumn (2.23) and lowest in spring (0.96). In autumn, the dominant species were Odontesthes bonariensis (34%), Parapimelodus valenciennis (32%) and Oligosarcus jenynsii (28%). In winter, the dominant species were only O. bonariensis and O. jenynsii, both representing more than 90%. A significant increase in CPUE was observed in pejerrey (O. bonariensis). Dominant size ranges were 15-17 and 20-25 cm Lst in O. bonariensis and 17-23 cm Lst in O. jenynsii. It can thus be concluded that Alsina lagoon has a key role as a biodiversity reservoir of continental waters. The ichthyc community has undergone modifications, of which the most relevant include: disappearance of P. valenciennis and increase of O. bonariensis. The recuperation of O. bonariensis stock therefore guarantees a promissing future for this environment which formerly reached highest productivity in Encadenadas del Oeste system.
Instituto de Limnología "Raúl A. Ringuelet"
description This study aims at characterizing the seasonal dynamics of the ichtyofauna of Alsina lagoon which belongs to the Encadenadas del Oeste (Province of Buenos Aires, Argentina). Fish sampling was performed on a three-month basis, from April 2007 to March 2008, using gill nets and a trawl net. Diversity (H’) and species richness were calculated for every sampling station and for each season. Differences in H´ values were analyzed via ANOVA. Relative abundance in number was estimated with net mesh capture. Capture per unit effort (CPUE) was calculated considering the fishing night as unit effort and the size structure of the dominant species was described. A total of 8643 individuals belonging to 14 species were captured. Species richness varied from 8 to 11. H´ evidenced no significant differences among places (p=0.15) although differences were recorded all over the year (p=0.001). H´ was highest in autumn (2.23) and lowest in spring (0.96). In autumn, the dominant species were Odontesthes bonariensis (34%), Parapimelodus valenciennis (32%) and Oligosarcus jenynsii (28%). In winter, the dominant species were only O. bonariensis and O. jenynsii, both representing more than 90%. A significant increase in CPUE was observed in pejerrey (O. bonariensis). Dominant size ranges were 15-17 and 20-25 cm Lst in O. bonariensis and 17-23 cm Lst in O. jenynsii. It can thus be concluded that Alsina lagoon has a key role as a biodiversity reservoir of continental waters. The ichthyc community has undergone modifications, of which the most relevant include: disappearance of P. valenciennis and increase of O. bonariensis. The recuperation of O. bonariensis stock therefore guarantees a promissing future for this environment which formerly reached highest productivity in Encadenadas del Oeste system.
publishDate 2009
dc.date.none.fl_str_mv 2009
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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status_str publishedVersion
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
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