Contribution to the limnological knowledge of the Paraguay river in its lower section

The main limnological feactures of the Paraguay river have been studied in two sampling sites: La Herradura and Puerto Bermejo stations. The former is situated above the confluence with the Bermejo river and the latter is located below the confluence. The phytoplankton community has been dominated b...

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Autores principales: Bonetto, Carlos A., Bonetto, Argentino A., Zalocar , Yolanda
Formato: Artículo revista
Lenguaje:Español
Publicado: Centro de Ecología Aplicada del Litoral (Consejo Nacional de Investigaciones Científicas y Técnicas - Universidad Nacional de Nordeste) 2023
Acceso en línea:https://revistas.unne.edu.ar/index.php/eco/article/view/7182
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Revistas UNNE - Universidad Nacional del Noroeste (UNNE) de Universidad Nacional del Nordeste
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record_format ojs
spelling I48-R154-article-71822024-02-16T11:12:14Z Contribution to the limnological knowledge of the Paraguay river in its lower section Contribución al conocimiento limnológico del Río Paraguay en su tramo inferior Bonetto, Carlos A. Bonetto, Argentino A. Zalocar , Yolanda The main limnological feactures of the Paraguay river have been studied in two sampling sites: La Herradura and Puerto Bermejo stations. The former is situated above the confluence with the Bermejo river and the latter is located below the confluence. The phytoplankton community has been dominated by Diatomophyceae (mainly Melosira granulala) and Chlorophyceae (mainly Monoraphídium, Schroederia and Scenedesmus). Crytophyceae (Cryptonomas) and Dinophyceae (Perldlnium) have always been present in low percentage. Cyanophyceae have usually been less than 4% of the total population density. In the low water period of the summer 1978-1979, the maximun phytoplankton density was estimated in 4 000 ind./ml and the production in 750 mg C/m2 d. During the flood period of May through October the lowest phytoplankton density (160 ind./ml) and production (60 mg C/m2 d) were measured. Variations in the suspended solid content and salinity of the water are discussed in relation to the hidrologic regime of the river. The huge amount of sedimenta carried by the Bermejo river to the lower Paraguay produces a drastic decrease in the transparency, phytoplankton density and production of the waters. On the other hand, conductivity, suspended solids and nutrients are highly increased. The main limnological feactures of the Paraguay river have been studied in two sampling sites: La Herradura and Puerto Bermejo stations. The former is situated above the confluence with the Bermejo river and the latter is located below the confluence. The phytoplankton community has been dominated by Diatomophyceae (mainly Melosira granulala) and Chlorophyceae (mainly Monoraphídium, Schroederia and Scenedesmus). Crytophyceae (Cryptonomas) and Dinophyceae (Perldlnium) have always been present in low percentage. Cyanophyceae have usually been less than 4% of the total population density. In the low water period of the summer 1978-1979, the maximun phytoplankton density was estimated in 4 000 ind./ml and the production in 750 mg C/m2 d. During the flood period of May through October the lowest phytoplankton density (160 ind./ml) and production (60 mg C/m2 d) were measured. Variations in the suspended solid content and salinity of the water are discussed in relation to the hidrologic regime of the river. The huge amount of sedimenta carried by the Bermejo river to the lower Paraguay produces a drastic decrease in the transparency, phytoplankton density and production of the waters. On the other hand, conductivity, suspended solids and nutrients are highly increased. Centro de Ecología Aplicada del Litoral (Consejo Nacional de Investigaciones Científicas y Técnicas - Universidad Nacional de Nordeste) 2023-12-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artículo revisado por pares application/pdf https://revistas.unne.edu.ar/index.php/eco/article/view/7182 10.30972/eco.8167182 Ecosur; 1981: vol. 8, no. 16; 55-88 0325-108X spa https://revistas.unne.edu.ar/index.php/eco/article/view/7182/6615
institution Universidad Nacional del Nordeste
institution_str I-48
repository_str R-154
container_title_str Revistas UNNE - Universidad Nacional del Noroeste (UNNE)
language Español
format Artículo revista
author Bonetto, Carlos A.
Bonetto, Argentino A.
Zalocar , Yolanda
spellingShingle Bonetto, Carlos A.
Bonetto, Argentino A.
Zalocar , Yolanda
Contribution to the limnological knowledge of the Paraguay river in its lower section
author_facet Bonetto, Carlos A.
Bonetto, Argentino A.
Zalocar , Yolanda
author_sort Bonetto, Carlos A.
title Contribution to the limnological knowledge of the Paraguay river in its lower section
title_short Contribution to the limnological knowledge of the Paraguay river in its lower section
title_full Contribution to the limnological knowledge of the Paraguay river in its lower section
title_fullStr Contribution to the limnological knowledge of the Paraguay river in its lower section
title_full_unstemmed Contribution to the limnological knowledge of the Paraguay river in its lower section
title_sort contribution to the limnological knowledge of the paraguay river in its lower section
description The main limnological feactures of the Paraguay river have been studied in two sampling sites: La Herradura and Puerto Bermejo stations. The former is situated above the confluence with the Bermejo river and the latter is located below the confluence. The phytoplankton community has been dominated by Diatomophyceae (mainly Melosira granulala) and Chlorophyceae (mainly Monoraphídium, Schroederia and Scenedesmus). Crytophyceae (Cryptonomas) and Dinophyceae (Perldlnium) have always been present in low percentage. Cyanophyceae have usually been less than 4% of the total population density. In the low water period of the summer 1978-1979, the maximun phytoplankton density was estimated in 4 000 ind./ml and the production in 750 mg C/m2 d. During the flood period of May through October the lowest phytoplankton density (160 ind./ml) and production (60 mg C/m2 d) were measured. Variations in the suspended solid content and salinity of the water are discussed in relation to the hidrologic regime of the river. The huge amount of sedimenta carried by the Bermejo river to the lower Paraguay produces a drastic decrease in the transparency, phytoplankton density and production of the waters. On the other hand, conductivity, suspended solids and nutrients are highly increased.
publisher Centro de Ecología Aplicada del Litoral (Consejo Nacional de Investigaciones Científicas y Técnicas - Universidad Nacional de Nordeste)
publishDate 2023
url https://revistas.unne.edu.ar/index.php/eco/article/view/7182
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first_indexed 2024-08-21T22:39:05Z
last_indexed 2024-08-21T22:39:05Z
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