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Abstract:

We conducted a 1-year survey in two humic shallow lakes from the floodplain of the Lower Paraná River, Laguna Grande Lake (LGL) and a relictual oxbow lake (ROL). We aimed to test two hypotheses: (1) the efficiency in light use of picoplankton (0. 2-3 μm) is greater as light restriction increases and (2) the contribution of picoplankton to the total productivity is higher when the total photosynthetic biomass is lower. We performed P-E curves for picoplankton and nano- and microplankton (>3 μm) using the 14C assimilation technique. The light environments of the water bodies differed mainly owing to the development of free floating plants on the surface of the ROL and the dominance of phytoplankton in LGL. Primary productivity patterns in LGL were seasonality driven whilst in the ROL they were related to the coverage of floating macrophytes, which promoted light limitation and a lower productivity. In LGL, nano- and microplankton were in general more productive and the relative contribution of picoplankton to the total phytoplankton production decreased with the increase in total photosynthetic biomass. Hence, our study extends previously observed patterns to subtropical shallow lakes, where seasonality and free floating plants may influence the dynamics of phytoplankton production. © 2012 Springer Science+Business Media B.V.

Registro:

Documento: Artículo
Título:Size fractionated phytoplankton production in two humic shallow lakes with contrasting coverage of free floating plants
Autor:Rodríguez, P.; Pizarro, H.; Vera, M.S.
Filiación:Laboratorio de Limnología, Departamento de Ecologia, Genetica y Evolucion, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET), Piso 4, Pabellón 2, Ciudad Universitaria, C1428EHA Ciudad de Buenos Aires, Argentina
Palabras clave:Humic shallow lakes; Pico-, nano- and microphytoplankton; Productivity; South America; Subtropical wetland; biomass; carbon isotope; dominance; floodplain; fractionation; humic substance; photosynthesis; phytoplankton; picoplankton; primary production; seasonality; shallow water; size structure; subtropical region; wetland; Parana River
Año:2012
Volumen:691
Número:1
Página de inicio:285
Página de fin:298
DOI: http://dx.doi.org/10.1007/s10750-012-1081-5
Título revista:Hydrobiologia
Título revista abreviado:Hydrobiologia
ISSN:00188158
CODEN:HYDRB
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00188158_v691_n1_p285_Rodriguez

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Citas:

---------- APA ----------
Rodríguez, P., Pizarro, H. & Vera, M.S. (2012) . Size fractionated phytoplankton production in two humic shallow lakes with contrasting coverage of free floating plants. Hydrobiologia, 691(1), 285-298.
http://dx.doi.org/10.1007/s10750-012-1081-5
---------- CHICAGO ----------
Rodríguez, P., Pizarro, H., Vera, M.S. "Size fractionated phytoplankton production in two humic shallow lakes with contrasting coverage of free floating plants" . Hydrobiologia 691, no. 1 (2012) : 285-298.
http://dx.doi.org/10.1007/s10750-012-1081-5
---------- MLA ----------
Rodríguez, P., Pizarro, H., Vera, M.S. "Size fractionated phytoplankton production in two humic shallow lakes with contrasting coverage of free floating plants" . Hydrobiologia, vol. 691, no. 1, 2012, pp. 285-298.
http://dx.doi.org/10.1007/s10750-012-1081-5
---------- VANCOUVER ----------
Rodríguez, P., Pizarro, H., Vera, M.S. Size fractionated phytoplankton production in two humic shallow lakes with contrasting coverage of free floating plants. Hydrobiologia. 2012;691(1):285-298.
http://dx.doi.org/10.1007/s10750-012-1081-5