An introduction to the benthos study in the High Paraná River

This paper deals with the results of benthic studies carried out in the High Paraná River in the middle section, between the localities of Corpus and Itá Ibaté. Samples were collected monthly in the central area of the river channel from August 1977 to April 1980, using a Dietz-Lafond dredge, and fi...

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Autores principales: Varela, María E., Bechara, María E., Andreani, Nora L.
Formato: Artículo revista
Lenguaje:Español
Publicado: Centro de Ecología Aplicada del Litoral (Consejo Nacional de Investigaciones Científicas y Técnicas - Universidad Nacional de Nordeste) 2024
Acceso en línea:https://revistas.unne.edu.ar/index.php/eco/article/view/8042
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Revistas UNNE - Universidad Nacional del Noroeste (UNNE) de Universidad Nacional del Nordeste
id I48-R154-article-8042
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spelling I48-R154-article-80422025-07-18T12:04:28Z An introduction to the benthos study in the High Paraná River Introducción al estudio del Bentos del Alto Paraná Varela, María E. Bechara, María E. Andreani, Nora L. This paper deals with the results of benthic studies carried out in the High Paraná River in the middle section, between the localities of Corpus and Itá Ibaté. Samples were collected monthly in the central area of the river channel from August 1977 to April 1980, using a Dietz-Lafond dredge, and filtered in the laboratory through 600 μm and 150 μm mesh opening screens. Occasionally, some samples were taken at particular sites, especially in marginal areas.Analysis of the specific composition reveals a close relationship between the benthic fauna and the characteristics of the substrates: sandy, muddy, and rocky bottoms. In sandy bottoms, the species composition was very similar along the sampled reach, with numerical dominance of a species of Oligochaeta: Marapa posthiobris.Remarkable variations were recorded across transversal and longitudinal sections (between 1,000 and 72,000 individuals per square meter), probably related to sediment granulometry and local current speed variations.Analysis of the spedfic composition reveals a close relation of the benthic fauna with the characteristics of the substrates: sandy, muddy and rocky bottoms. In sandy bottoms the specific composition was very similar along the sampled reach, with numerical dominance of a species of Oligochaeta: Narapa bonettoi. Remarkable variations were registered through transversal and longitudinal sections (between 1.000 and 72.000 individuals per square meters), probably related to sediment granulometry and local current speed variations. Este trabajo trata sobre los resultados de estudios bentónicos realizados en el Alto Paraná, en el tramo medio comprendido entre las localidades de Corpus e Itá Ibaté. Las muestras fueron recolectadas mensualmente en la zona central del cauce, desde agosto de 1977 hasta abril de 1980, utilizando una draga Dietz-Lafond, y filtradas en laboratorio con tamices de 600 μm y 150 μm de abertura de malla. Ocasionalmente, se tomaron algunas muestras en sitios específicos, especialmente en zonas marginales.El análisis de la composición específica revela una estrecha relación entre la fauna bentónica y las características del sustrato: fondos arenosos, fangosos y rocosos. En los fondos arenosos, la composición específica fue muy similar a lo largo del tramo muestreado, con un claro dominio numérico de una especie de oligoqueto: Marapa posthiobris.Se registraron notables variaciones en cortes transversales y longitudinales (entre 1.000 y 72.000 individuos por metro cuadrado), probablemente relacionadas con la granulometría del sedimento y variaciones en la velocidad de la corriente local. Centro de Ecología Aplicada del Litoral (Consejo Nacional de Investigaciones Científicas y Técnicas - Universidad Nacional de Nordeste) 2024-12-20 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/8042 Ecosur; 1983: vol. 10, nos. 19-20; 108-126 0325-108X spa https://revistas.unne.edu.ar/index.php/eco/article/view/8042/8027 https://creativecommons.org/licenses/by-nc/4.0
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 Varela, María E.
Bechara, María E.
Andreani, Nora L.
spellingShingle Varela, María E.
Bechara, María E.
Andreani, Nora L.
An introduction to the benthos study in the High Paraná River
author_facet Varela, María E.
Bechara, María E.
Andreani, Nora L.
author_sort Varela, María E.
title An introduction to the benthos study in the High Paraná River
title_short An introduction to the benthos study in the High Paraná River
title_full An introduction to the benthos study in the High Paraná River
title_fullStr An introduction to the benthos study in the High Paraná River
title_full_unstemmed An introduction to the benthos study in the High Paraná River
title_sort introduction to the benthos study in the high paraná river
description This paper deals with the results of benthic studies carried out in the High Paraná River in the middle section, between the localities of Corpus and Itá Ibaté. Samples were collected monthly in the central area of the river channel from August 1977 to April 1980, using a Dietz-Lafond dredge, and filtered in the laboratory through 600 μm and 150 μm mesh opening screens. Occasionally, some samples were taken at particular sites, especially in marginal areas.Analysis of the specific composition reveals a close relationship between the benthic fauna and the characteristics of the substrates: sandy, muddy, and rocky bottoms. In sandy bottoms, the species composition was very similar along the sampled reach, with numerical dominance of a species of Oligochaeta: Marapa posthiobris.Remarkable variations were recorded across transversal and longitudinal sections (between 1,000 and 72,000 individuals per square meter), probably related to sediment granulometry and local current speed variations.Analysis of the spedfic composition reveals a close relation of the benthic fauna with the characteristics of the substrates: sandy, muddy and rocky bottoms. In sandy bottoms the specific composition was very similar along the sampled reach, with numerical dominance of a species of Oligochaeta: Narapa bonettoi. Remarkable variations were registered through transversal and longitudinal sections (between 1.000 and 72.000 individuals per square meters), probably related to sediment granulometry and local current speed variations.
publisher Centro de Ecología Aplicada del Litoral (Consejo Nacional de Investigaciones Científicas y Técnicas - Universidad Nacional de Nordeste)
publishDate 2024
url https://revistas.unne.edu.ar/index.php/eco/article/view/8042
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