Phytoplankton productivity in a highly colored shallow lake of a South American floodplain

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 e...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Rodríguez, Patricia Laura, Pizarro, Haydee Norma
Publicado:	2007
Materias:	Areal photosynthetic rate Argentina Humic wetland P-E curves floodplain humic acid photosynthesis phytoplankton primary production wetland Parana River South America algae Chlorophyta Cryptophyta Cyanobacteria
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02775212_v27_n4_p1153_Rodriguez http://hdl.handle.net/20.500.12110/paper_02775212_v27_n4_p1153_Rodriguez
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_02775212_v27_n4_p1153_Rodriguez
record_format	dspace
spelling	paper:paper_02775212_v27_n4_p1153_Rodriguez2023-06-08T15:26:02Z Phytoplankton productivity in a highly colored shallow lake of a South American floodplain Rodríguez, Patricia Laura Pizarro, Haydee Norma 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 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. Fil:Rodríguez, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pizarro, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2007 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02775212_v27_n4_p1153_Rodriguez http://hdl.handle.net/20.500.12110/paper_02775212_v27_n4_p1153_Rodriguez
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	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
spellingShingle	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 Rodríguez, Patricia Laura Pizarro, Haydee Norma Phytoplankton productivity in a highly colored shallow lake of a South American floodplain
topic_facet	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
description	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.
author	Rodríguez, Patricia Laura Pizarro, Haydee Norma
author_facet	Rodríguez, Patricia Laura Pizarro, Haydee Norma
author_sort	Rodríguez, Patricia Laura
title	Phytoplankton productivity in a highly colored shallow lake of a South American floodplain
title_short	Phytoplankton productivity in a highly colored shallow lake of a South American floodplain
title_full	Phytoplankton productivity in a highly colored shallow lake of a South American floodplain
title_fullStr	Phytoplankton productivity in a highly colored shallow lake of a South American floodplain
title_full_unstemmed	Phytoplankton productivity in a highly colored shallow lake of a South American floodplain
title_sort	phytoplankton productivity in a highly colored shallow lake of a south american floodplain
publishDate	2007
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02775212_v27_n4_p1153_Rodriguez http://hdl.handle.net/20.500.12110/paper_02775212_v27_n4_p1153_Rodriguez
work_keys_str_mv	AT rodriguezpatricialaura phytoplanktonproductivityinahighlycoloredshallowlakeofasouthamericanfloodplain AT pizarrohaydeenorma phytoplanktonproductivityinahighlycoloredshallowlakeofasouthamericanfloodplain
_version_	1768544317486399488

Phytoplankton productivity in a highly colored shallow lake of a South American floodplain

Ejemplares similares