Dynamics of the phytoplankton execretion of organic matter. (Chascomús Pond, Buenos Aires, Argentina)

The rate of phytoplankton excretion of organic matter was measured by acidification of water samples incubated in the laboratory following the Steemann Nielscn method (1952). After the release of inorganic 14C,14C-organic carbón was estimated through Berman's methodology (1976). Percentages of...

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Autores principales: Romero, M. Cristina, Arenas, Patricia M., Mariazzi, Aldo A.
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/7103
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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-71032023-12-01T21:25:08Z Dynamics of the phytoplankton execretion of organic matter. (Chascomús Pond, Buenos Aires, Argentina) Dinámica de la excreción fitoplanctónica de materia orgánica (Laguna de Chascomús, Prov. de Buenos Aires, Argentina) Romero, M. Cristina Arenas, Patricia M. Mariazzi, Aldo A. The rate of phytoplankton excretion of organic matter was measured by acidification of water samples incubated in the laboratory following the Steemann Nielscn method (1952). After the release of inorganic 14C,14C-organic carbón was estimated through Berman's methodology (1976). Percentages of excretion of organic carbón ranged bctween 8 and 18% (mean value 13,5%) were the lowest observed, supporting the hypothesis that the cxcretion is lower in eutrophic waters. Thesc percentages incrcascd during winter and decresed during summer: instead rates of release of organic matter showed a bimodal distribution with two máximum valúes, one in winter and other in summer (57,6 and 72,0 mg C • m-3 • h-1, respectively). Percentages of cxcretion showed and inverse relationship with phytoplankton photosynthesis and chlorophyll-a concentrations (P < 0,01). Scasonal fluctuations of excretion were influenced by light intcnsity, with higher light rates during winter than in summer. The rate of phytoplankton excretion of organic matter was measured by acidification of water samples incubated in the laboratory following the Steemann Nielscn method (1952). After the release of inorganic 14C,14C-organic carbón was estimated through Berman's methodology (1976). Percentages of excretion of organic carbón ranged bctween 8 and 18% (mean value 13,5%) were the lowest observed, supporting the hypothesis that the cxcretion is lower in eutrophic waters. Thesc percentages incrcascd during winter and decresed during summer: instead rates of release of organic matter showed a bimodal distribution with two máximum valúes, one in winter and other in summer (57,6 and 72,0 mg C • m-3 • h-1, respectively). Percentages of cxcretion showed and inverse relationship with phytoplankton photosynthesis and chlorophyll-a concentrations (P < 0,01). Scasonal fluctuations of excretion were influenced by light intcnsity, with higher light rates during winter than in summer. Centro de Ecología Aplicada del Litoral (Consejo Nacional de Investigaciones Científicas y Técnicas - Universidad Nacional de Nordeste) 2023-12-01 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/7103 10.30972/eco.14257103 Ecosur; 1987: vol. 14-15, nos. 25-26; 73-80 0325-108X spa https://revistas.unne.edu.ar/index.php/eco/article/view/7103/6540
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 Romero, M. Cristina
Arenas, Patricia M.
Mariazzi, Aldo A.
spellingShingle Romero, M. Cristina
Arenas, Patricia M.
Mariazzi, Aldo A.
Dynamics of the phytoplankton execretion of organic matter. (Chascomús Pond, Buenos Aires, Argentina)
author_facet Romero, M. Cristina
Arenas, Patricia M.
Mariazzi, Aldo A.
author_sort Romero, M. Cristina
title Dynamics of the phytoplankton execretion of organic matter. (Chascomús Pond, Buenos Aires, Argentina)
title_short Dynamics of the phytoplankton execretion of organic matter. (Chascomús Pond, Buenos Aires, Argentina)
title_full Dynamics of the phytoplankton execretion of organic matter. (Chascomús Pond, Buenos Aires, Argentina)
title_fullStr Dynamics of the phytoplankton execretion of organic matter. (Chascomús Pond, Buenos Aires, Argentina)
title_full_unstemmed Dynamics of the phytoplankton execretion of organic matter. (Chascomús Pond, Buenos Aires, Argentina)
title_sort dynamics of the phytoplankton execretion of organic matter. (chascomús pond, buenos aires, argentina)
description The rate of phytoplankton excretion of organic matter was measured by acidification of water samples incubated in the laboratory following the Steemann Nielscn method (1952). After the release of inorganic 14C,14C-organic carbón was estimated through Berman's methodology (1976). Percentages of excretion of organic carbón ranged bctween 8 and 18% (mean value 13,5%) were the lowest observed, supporting the hypothesis that the cxcretion is lower in eutrophic waters. Thesc percentages incrcascd during winter and decresed during summer: instead rates of release of organic matter showed a bimodal distribution with two máximum valúes, one in winter and other in summer (57,6 and 72,0 mg C • m-3 • h-1, respectively). Percentages of cxcretion showed and inverse relationship with phytoplankton photosynthesis and chlorophyll-a concentrations (P < 0,01). Scasonal fluctuations of excretion were influenced by light intcnsity, with higher light rates during winter than in summer.
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/7103
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first_indexed 2024-08-21T22:38:53Z
last_indexed 2024-08-21T22:38:53Z
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