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Abstract:

We described phytoplankton productivity in a floodplain wetland of the Lower Paraná River, Argentina. Four samplings encompassing periods of high and low water levels were conducted in a highly colored shallow lake. Photosynthesis-irradiance (P-E) curves and the areal photosynthetic rate (PA) were estimated following the 14C assimilation technique. Likewise, physical and chemical variables and phytoplankton composition, density, and chlorophyll a concentration were measured. Phytoplankton assemblages shifted from cyanobacteria blooms in summer to cryptophycean dominance in winter, and co-dominance of cryptophytes and chlorophytes in autumn. Assimilation number Pmax ranged from 3-7.8 μg C (μg Chl a h)-1 and peaked in early summer (low water level) when water color was highest, suggesting that phytoplankton productivity was not depressed by the high content of colored humic acids. Photosynthetic efficiency (α) ranged from 0.021-1 μg C (μg Chl a h)-1 μmol photons-1 m2 s and reached its maximum value during winter even when the assemblage, dominated by cryptophyceans, did not achieve light saturation. In early and late summer and in autumn, optimal irradiance (Eopt) ranged from 544-1,397 μmol photons m-2 s-1. The highest PA (207 mg C m-2 h-1) was registered in late summer (high water level) when the lowest mean irradiance (Emean) was observed (341 μmol photons m-2 s-1). The lowest PA (28 mg C m-2 h-1) occurred in winter when Emean was maximum (1,432 μmol photons m-2 s-1). Our results indicate that productivity was similar to those recorded for other latitudes and appeared not limited by the humic content of the water because phytoplankton was dominated by algae well-adapted to low light conditions. © 2007, The Society of Wetland Scientists.

Registro:

Documento: Artículo
Título:Phytoplankton productivity in a highly colored shallow lake of a South American floodplain
Autor:Rodríguez, P.; Pizarro, H.
Filiación:Laboratorio de Limnología Departamento de Ecología Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Piso 4 Pabellón 2, C 1428 EHA Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina
Palabras clave:Areal photosynthetic rate; Argentina; Humic wetland; P-E curves; floodplain; humic acid; photosynthesis; phytoplankton; primary production; wetland; Argentina; Parana River; South America; algae; Chlorophyta; Cryptophyta; Cyanobacteria
Año:2007
Volumen:27
Número:4
Página de inicio:1153
Página de fin:1160
DOI: http://dx.doi.org/10.1672/0277-5212(2007)27[1153:PPIAHC]2.0.CO;2
Título revista:Wetlands
Título revista abreviado:Wetlands
ISSN:02775212
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02775212_v27_n4_p1153_Rodriguez

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Citas:

---------- APA ----------
Rodríguez, P. & Pizarro, H. (2007) . Phytoplankton productivity in a highly colored shallow lake of a South American floodplain. Wetlands, 27(4), 1153-1160.
http://dx.doi.org/10.1672/0277-5212(2007)27[1153:PPIAHC]2.0.CO;2
---------- CHICAGO ----------
Rodríguez, P., Pizarro, H. "Phytoplankton productivity in a highly colored shallow lake of a South American floodplain" . Wetlands 27, no. 4 (2007) : 1153-1160.
http://dx.doi.org/10.1672/0277-5212(2007)27[1153:PPIAHC]2.0.CO;2
---------- MLA ----------
Rodríguez, P., Pizarro, H. "Phytoplankton productivity in a highly colored shallow lake of a South American floodplain" . Wetlands, vol. 27, no. 4, 2007, pp. 1153-1160.
http://dx.doi.org/10.1672/0277-5212(2007)27[1153:PPIAHC]2.0.CO;2
---------- VANCOUVER ----------
Rodríguez, P., Pizarro, H. Phytoplankton productivity in a highly colored shallow lake of a South American floodplain. Wetlands. 2007;27(4):1153-1160.
http://dx.doi.org/10.1672/0277-5212(2007)27[1153:PPIAHC]2.0.CO;2