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Abstract:

This study evaluates temporal variations of physicochemical variables and densities of phytoplankton and zooplankton, under different flow conditions. Four samplings were carried out at four sites on the Lower Delta of the Paraná River (Argentina). This first approach was developed in 1995 and included a flood of high amplitude and average duration. Daily data analysis along the year qualified sampling water levels as very high, medium (two opportunities) and low level. Triplicate subsuperficial water samples were taken in the middle of the navigation channel. Dissolved oxygen, pH, conductivity and temperature were determined in situ; nutrients and concentration of major solutes in the laboratory. Quantitative samples of phytoplankton (concentrated by sedimentation) and zooplankton (80 1; 48 μm) were obtained. Temporal variation of most physical, chemical and biological variables exceeded the spatial variation. Physicochemical variables were mainly associated in time with the hydrological regime. In the main channel water exchange originated by the flood of marshy environments caused dissolved oxygen, nitrate and sulphate to decrease and phosphate, conductivity, bicarbonate, calcium and magnesium to increase. The dilution-concentration action of flow was evidenced in chloride variation (conservative ion). The plankton variables would be affected directly and indirectly by water level, and also by seasonal climatic condition. The densities of phytoplankton and zooplankton increased during low flow. For some organisms, the variation in density exceeded the simple concentration effect of flow decrease. The lowest plankton densities coincided with a temperature minimum. © 2003 John Wiley & Sons, Ltd.

Registro:

Documento: Artículo
Título:Physicochemical variables and plankton from the Lower Delta of the Paraná River (Argentina) in relation to flow
Autor:de Cabo, L.; Puig, A.; Arreghini, S.; Olguín, H.F.; Seoane, R.; Obertello, I.
Filiación:Mus. e Inst. Nac. Invest. Cie. Nat., División Limnología, Av. Angel Gallardo 470, Buenos Aires CI405JR, Argentina
Becaria Comision Invest. Cientificas, Provencia de Buenos Aires, Argentina
Departamento de Ciencias Biologicas, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires CI428EHA, Argentina
Inst. Nac. del Agua y del Ambiente, AU Ezeiza-Cañuelas, Km 1.6, 1804 Ezeiza, Provincia de Buenos Aires, Argentina
CONICET, Buenos Aires, Argentina
Facultad de Ingeniería, Universidad de Buenos Aires, Av. Las Heras 2214, Buenos Aires CI127AAR, Argentina
Palabras clave:Delta; Ecohydrology; Flow; Paraná River; Physicochemistry; Phytoplankton; South America; Zooplankton; Electric conductivity; Hydrology; pH effects; Planktons; Microorganisms; delta; physicochemical property; phytoplankton; population density; river flow; temporal variation; zooplankton; Argentina
Año:2003
Volumen:17
Número:7
Página de inicio:1279
Página de fin:1290
DOI: http://dx.doi.org/10.1002/hyp.1284
Título revista:Hydrological Processes
Título revista abreviado:Hydrol. Processes
ISSN:08856087
CODEN:HYPRE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08856087_v17_n7_p1279_deCabo

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Citas:

---------- APA ----------
de Cabo, L., Puig, A., Arreghini, S., Olguín, H.F., Seoane, R. & Obertello, I. (2003) . Physicochemical variables and plankton from the Lower Delta of the Paraná River (Argentina) in relation to flow. Hydrological Processes, 17(7), 1279-1290.
http://dx.doi.org/10.1002/hyp.1284
---------- CHICAGO ----------
de Cabo, L., Puig, A., Arreghini, S., Olguín, H.F., Seoane, R., Obertello, I. "Physicochemical variables and plankton from the Lower Delta of the Paraná River (Argentina) in relation to flow" . Hydrological Processes 17, no. 7 (2003) : 1279-1290.
http://dx.doi.org/10.1002/hyp.1284
---------- MLA ----------
de Cabo, L., Puig, A., Arreghini, S., Olguín, H.F., Seoane, R., Obertello, I. "Physicochemical variables and plankton from the Lower Delta of the Paraná River (Argentina) in relation to flow" . Hydrological Processes, vol. 17, no. 7, 2003, pp. 1279-1290.
http://dx.doi.org/10.1002/hyp.1284
---------- VANCOUVER ----------
de Cabo, L., Puig, A., Arreghini, S., Olguín, H.F., Seoane, R., Obertello, I. Physicochemical variables and plankton from the Lower Delta of the Paraná River (Argentina) in relation to flow. Hydrol. Processes. 2003;17(7):1279-1290.
http://dx.doi.org/10.1002/hyp.1284