Relationship between the zoo- and phytoplankton biomasses in a saline lowland river (Argentina): a short-time-scale analysis

Autores
Gabellone, Néstor Adrián; Claps, María Cristina; Ardohain, Diego Martín; Dippolito, Andrea; Bazzuri, María Elisa; Solari, Lía Cristina
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Short-time-scale (days) lotic investigations during low-discharge conditions are appropriate for elucidating trophic relationships within plankton. The objectives of this study were to determine the successional changes in the zooplankton biomass, the relationship of that biomass to physical parameters and palatable phytoplankton species, and to evaluate the observational time scale. Plankton samples were taken thrice weekly at two sampling stations in the Salado River lower sector (Buenos Aires province, Argentina). Since almost one-third of the country’s agricultural and cattle productions come from the Salado-River basin with their resulting impacts (nutrients, suspended material) in the basin, limnological research has been conducted there during recent decades. To estimate grazing, we employed three models and also the relationship between the zoo- and nanoplankton biomasses. The seasonal temperature and conductivity changes indicated three clearly different periods and were the main parameters driving the seasonal succession of the zooplankton. During the first period, the total zooplankton biomass was less than in the other two, with the tintinnids predominating. Later, the rotifers became prevalent with a predomination by Brachionus plicatilis and Keratella tropica. The grazing pressure of the r-strategy dominated zooplankters was highly variable. Zooplankter-species replacement by those of different grazing efficiencies promoted changes in the phytoplankton structure and nanoplankton biomass. A top-down effect on the total phytoplankton biomass by the zooplankton was not detected, though an abundance diminution for certain palatable algae was observed. The biomass of the nanoplankton species was significantly related to the total zooplankton biomass, with the highest rotifer values being associated with an exponential decrease in the nanoplankton biomass.
Instituto de Limnología "Dr. Raúl A. Ringuelet"
Materia
Ciencias Naturales
plankton
biomass
Pampean lowland river
Argentina
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/152804

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spelling Relationship between the zoo- and phytoplankton biomasses in a saline lowland river (Argentina): a short-time-scale analysisGabellone, Néstor AdriánClaps, María CristinaArdohain, Diego MartínDippolito, AndreaBazzuri, María ElisaSolari, Lía CristinaCiencias NaturalesplanktonbiomassPampean lowland riverArgentinaShort-time-scale (days) lotic investigations during low-discharge conditions are appropriate for elucidating trophic relationships within plankton. The objectives of this study were to determine the successional changes in the zooplankton biomass, the relationship of that biomass to physical parameters and palatable phytoplankton species, and to evaluate the observational time scale. Plankton samples were taken thrice weekly at two sampling stations in the Salado River lower sector (Buenos Aires province, Argentina). Since almost one-third of the country’s agricultural and cattle productions come from the Salado-River basin with their resulting impacts (nutrients, suspended material) in the basin, limnological research has been conducted there during recent decades. To estimate grazing, we employed three models and also the relationship between the zoo- and nanoplankton biomasses. The seasonal temperature and conductivity changes indicated three clearly different periods and were the main parameters driving the seasonal succession of the zooplankton. During the first period, the total zooplankton biomass was less than in the other two, with the tintinnids predominating. Later, the rotifers became prevalent with a predomination by Brachionus plicatilis and Keratella tropica. The grazing pressure of the r-strategy dominated zooplankters was highly variable. Zooplankter-species replacement by those of different grazing efficiencies promoted changes in the phytoplankton structure and nanoplankton biomass. A top-down effect on the total phytoplankton biomass by the zooplankton was not detected, though an abundance diminution for certain palatable algae was observed. The biomass of the nanoplankton species was significantly related to the total zooplankton biomass, with the highest rotifer values being associated with an exponential decrease in the nanoplankton biomass.Instituto de Limnología "Dr. Raúl A. Ringuelet"2014info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf307-327http://sedici.unlp.edu.ar/handle/10915/152804enginfo:eu-repo/semantics/altIdentifier/issn/1863-9135info:eu-repo/semantics/altIdentifier/doi/10.1127/1863-9135/2014/0643info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:39:32Zoai:sedici.unlp.edu.ar:10915/152804Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:39:32.71SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Relationship between the zoo- and phytoplankton biomasses in a saline lowland river (Argentina): a short-time-scale analysis
title Relationship between the zoo- and phytoplankton biomasses in a saline lowland river (Argentina): a short-time-scale analysis
spellingShingle Relationship between the zoo- and phytoplankton biomasses in a saline lowland river (Argentina): a short-time-scale analysis
Gabellone, Néstor Adrián
Ciencias Naturales
plankton
biomass
Pampean lowland river
Argentina
title_short Relationship between the zoo- and phytoplankton biomasses in a saline lowland river (Argentina): a short-time-scale analysis
title_full Relationship between the zoo- and phytoplankton biomasses in a saline lowland river (Argentina): a short-time-scale analysis
title_fullStr Relationship between the zoo- and phytoplankton biomasses in a saline lowland river (Argentina): a short-time-scale analysis
title_full_unstemmed Relationship between the zoo- and phytoplankton biomasses in a saline lowland river (Argentina): a short-time-scale analysis
title_sort Relationship between the zoo- and phytoplankton biomasses in a saline lowland river (Argentina): a short-time-scale analysis
dc.creator.none.fl_str_mv Gabellone, Néstor Adrián
Claps, María Cristina
Ardohain, Diego Martín
Dippolito, Andrea
Bazzuri, María Elisa
Solari, Lía Cristina
author Gabellone, Néstor Adrián
author_facet Gabellone, Néstor Adrián
Claps, María Cristina
Ardohain, Diego Martín
Dippolito, Andrea
Bazzuri, María Elisa
Solari, Lía Cristina
author_role author
author2 Claps, María Cristina
Ardohain, Diego Martín
Dippolito, Andrea
Bazzuri, María Elisa
Solari, Lía Cristina
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Ciencias Naturales
plankton
biomass
Pampean lowland river
Argentina
topic Ciencias Naturales
plankton
biomass
Pampean lowland river
Argentina
dc.description.none.fl_txt_mv Short-time-scale (days) lotic investigations during low-discharge conditions are appropriate for elucidating trophic relationships within plankton. The objectives of this study were to determine the successional changes in the zooplankton biomass, the relationship of that biomass to physical parameters and palatable phytoplankton species, and to evaluate the observational time scale. Plankton samples were taken thrice weekly at two sampling stations in the Salado River lower sector (Buenos Aires province, Argentina). Since almost one-third of the country’s agricultural and cattle productions come from the Salado-River basin with their resulting impacts (nutrients, suspended material) in the basin, limnological research has been conducted there during recent decades. To estimate grazing, we employed three models and also the relationship between the zoo- and nanoplankton biomasses. The seasonal temperature and conductivity changes indicated three clearly different periods and were the main parameters driving the seasonal succession of the zooplankton. During the first period, the total zooplankton biomass was less than in the other two, with the tintinnids predominating. Later, the rotifers became prevalent with a predomination by Brachionus plicatilis and Keratella tropica. The grazing pressure of the r-strategy dominated zooplankters was highly variable. Zooplankter-species replacement by those of different grazing efficiencies promoted changes in the phytoplankton structure and nanoplankton biomass. A top-down effect on the total phytoplankton biomass by the zooplankton was not detected, though an abundance diminution for certain palatable algae was observed. The biomass of the nanoplankton species was significantly related to the total zooplankton biomass, with the highest rotifer values being associated with an exponential decrease in the nanoplankton biomass.
Instituto de Limnología "Dr. Raúl A. Ringuelet"
description Short-time-scale (days) lotic investigations during low-discharge conditions are appropriate for elucidating trophic relationships within plankton. The objectives of this study were to determine the successional changes in the zooplankton biomass, the relationship of that biomass to physical parameters and palatable phytoplankton species, and to evaluate the observational time scale. Plankton samples were taken thrice weekly at two sampling stations in the Salado River lower sector (Buenos Aires province, Argentina). Since almost one-third of the country’s agricultural and cattle productions come from the Salado-River basin with their resulting impacts (nutrients, suspended material) in the basin, limnological research has been conducted there during recent decades. To estimate grazing, we employed three models and also the relationship between the zoo- and nanoplankton biomasses. The seasonal temperature and conductivity changes indicated three clearly different periods and were the main parameters driving the seasonal succession of the zooplankton. During the first period, the total zooplankton biomass was less than in the other two, with the tintinnids predominating. Later, the rotifers became prevalent with a predomination by Brachionus plicatilis and Keratella tropica. The grazing pressure of the r-strategy dominated zooplankters was highly variable. Zooplankter-species replacement by those of different grazing efficiencies promoted changes in the phytoplankton structure and nanoplankton biomass. A top-down effect on the total phytoplankton biomass by the zooplankton was not detected, though an abundance diminution for certain palatable algae was observed. The biomass of the nanoplankton species was significantly related to the total zooplankton biomass, with the highest rotifer values being associated with an exponential decrease in the nanoplankton biomass.
publishDate 2014
dc.date.none.fl_str_mv 2014
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
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://sedici.unlp.edu.ar/handle/10915/152804
url http://sedici.unlp.edu.ar/handle/10915/152804
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/1863-9135
info:eu-repo/semantics/altIdentifier/doi/10.1127/1863-9135/2014/0643
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
307-327
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