The phytoplankton of the Upper Parana River. Seasonal variation and distribution related to environmental faetors

Structure, population density and distribution of the phytoplankton of the Upper Paraná River (between Corpus and Ita Ibate) as well as its variations to climatic and hydrologic cycles, were studied from 1976 to 1978. Qualitative and quantitative sub-superficial samples were obtained by monthly samp...

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Autores principales: Zalocar de Domitrovic, Yolanda, Vallejos, Eugenio Ramón
Formato: Artículo revista
Lenguaje:Español
Publicado: Centro de Ecología Aplicada del Litoral (Consejo Nacional de Investigaciones Científicas y Técnicas - Universidad Nacional de Nordeste) 2025
Materias:
Río Paraná
fitoplancton
variación estacional
Acceso en línea:https://revistas.unne.edu.ar/index.php/eco/article/view/8580
Aporte de:
Revistas UNNE - Universidad Nacional del Noroeste (UNNE) de Universidad Nacional del Nordeste
id I48-R154-article-8580
record_format ojs
spelling I48-R154-article-85802025-08-21T15:01:58Z The phytoplankton of the Upper Parana River. Seasonal variation and distribution related to environmental faetors Fitoplancton del río Alto Paraná. Variación estacional y distribución en relación a factores ambientales Zalocar de Domitrovic, Yolanda Vallejos, Eugenio Ramón Río Paraná fitoplancton variación estacional Structure, population density and distribution of the phytoplankton of the Upper Paraná River (between Corpus and Ita Ibate) as well as its variations to climatic and hydrologic cycles, were studied from 1976 to 1978. Qualitative and quantitative sub-superficial samples were obtained by monthly sampling in the middle of the river. Counts were done by the Utermóhl method with an inverted microscope. Population density of phytoplankton ranged between 33 and 1 397 ind/ml, increasing downstream. Structural composition of this community was uniform through the studied area. The prevailing group were Diatomophyceae. Among them, Melosira granulata and M.pseudogranulata were the most abundant. Occasionally, Synedra prevailed. The Cyanophyceae occurred more frequently during summer, being Lyngbya limnetica, Raphidiopsis mediterránea and Anabaena spiroides the most numerous. These groups could even exeeed the number of Diatomophyceae in summer time. Among Chlorophyceae, Monoraphidium, Scenedesmus and Schroederia were the dominant. Fluctuations in phytoplankton were related to water transparency and hydrometric level of the river. Phytoplankton concentration was low in high turbidity conditions of flood periods, increasing in low water phases and higher water transparency.  Se estudiaron la estructura, la densidad poblacional y la distribución del fitoplancton en el Alto Río Paraná (entre Corpus e Ita Ibaté), así como sus variaciones en relación con los ciclos climáticos e hidrológicos, durante el período de 1976 a 1978. Se obtuvieron muestras subsuperficiales cualitativas y cuantitativas mediante un muestreo mensual en la mitad del río. Los recuentos se realizaron con un microscopio invertido utilizando el método de Utermöhl. La densidad poblacional del fitoplancton osciló entre 33 y 1.397 individuos/ml, aumentando río abajo. La composición estructural de esta comunidad fue uniforme en toda el área estudiada. El grupo predominante fueron las Diatomophyceae. Entre ellas, Melosira granulata y M. pseudogranulata fueron las más abundantes. Ocasionalmente, predominó el género Synedra. Las Cyanophyceae se encontraron con mayor frecuencia durante el verano, siendo Lyngbya limnetica, Raphidiopsis mediterránea y Anabaena spiroides las más numerosas. Estos grupos incluso llegaron a superar en número a las Diatomophyceae en la época de verano. Entre las Chlorophyceae, los géneros Monoraphidium, Scenedesmus y Schroederia fueron los dominantes. Las fluctuaciones del fitoplancton estuvieron relacionadas con la transparencia del agua y el nivel hidrométrico del río. La concentración de fitoplancton fue baja en condiciones de alta turbidez durante los períodos de inundación, y aumentó en las fases de aguas bajas y mayor transparencia. Centro de Ecología Aplicada del Litoral (Consejo Nacional de Investigaciones Científicas y Técnicas - Universidad Nacional de Nordeste) 2025-08-21 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/8580 Ecosur; 1982: vol. 9, no. 17; 1-28 0325-108X spa https://revistas.unne.edu.ar/index.php/eco/article/view/8580/8126 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
topic Río Paraná
fitoplancton
variación estacional
spellingShingle Río Paraná
fitoplancton
variación estacional
Zalocar de Domitrovic, Yolanda
Vallejos, Eugenio Ramón
The phytoplankton of the Upper Parana River. Seasonal variation and distribution related to environmental faetors
topic_facet Río Paraná
fitoplancton
variación estacional
author Zalocar de Domitrovic, Yolanda
Vallejos, Eugenio Ramón
author_facet Zalocar de Domitrovic, Yolanda
Vallejos, Eugenio Ramón
author_sort Zalocar de Domitrovic, Yolanda
title The phytoplankton of the Upper Parana River. Seasonal variation and distribution related to environmental faetors
title_short The phytoplankton of the Upper Parana River. Seasonal variation and distribution related to environmental faetors
title_full The phytoplankton of the Upper Parana River. Seasonal variation and distribution related to environmental faetors
title_fullStr The phytoplankton of the Upper Parana River. Seasonal variation and distribution related to environmental faetors
title_full_unstemmed The phytoplankton of the Upper Parana River. Seasonal variation and distribution related to environmental faetors
title_sort phytoplankton of the upper parana river. seasonal variation and distribution related to environmental faetors
description Structure, population density and distribution of the phytoplankton of the Upper Paraná River (between Corpus and Ita Ibate) as well as its variations to climatic and hydrologic cycles, were studied from 1976 to 1978. Qualitative and quantitative sub-superficial samples were obtained by monthly sampling in the middle of the river. Counts were done by the Utermóhl method with an inverted microscope. Population density of phytoplankton ranged between 33 and 1 397 ind/ml, increasing downstream. Structural composition of this community was uniform through the studied area. The prevailing group were Diatomophyceae. Among them, Melosira granulata and M.pseudogranulata were the most abundant. Occasionally, Synedra prevailed. The Cyanophyceae occurred more frequently during summer, being Lyngbya limnetica, Raphidiopsis mediterránea and Anabaena spiroides the most numerous. These groups could even exeeed the number of Diatomophyceae in summer time. Among Chlorophyceae, Monoraphidium, Scenedesmus and Schroederia were the dominant. Fluctuations in phytoplankton were related to water transparency and hydrometric level of the river. Phytoplankton concentration was low in high turbidity conditions of flood periods, increasing in low water phases and higher water transparency. 
publisher Centro de Ecología Aplicada del Litoral (Consejo Nacional de Investigaciones Científicas y Técnicas - Universidad Nacional de Nordeste)
publishDate 2025
url https://revistas.unne.edu.ar/index.php/eco/article/view/8580
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first_indexed 2025-10-17T05:01:37Z
last_indexed 2025-10-17T05:01:37Z
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