Phytoplankton response to pH rise in a N-limited floodplain lake: Relevance of N2-fixing heterocystous cyanobacteria

Phosphorus has been traditionally regarded as the controlling nutrient for phytoplankton growth, however, N-limitation is likely to occur in several environments. For example, nitrogen is considered the main nutrient limiting phytoplankton in floodplain lakes of the Paraná River basin. However, N2-f...

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Autores principales:	Unrein, F., O'Farrell, I., Izaguirre, I., Sinistro, R., dos Santos Afonso, M., Tell, G.
Formato:	JOUR
Materias:	N2-fixing cyanobacteria pH Phytoplankton community composition cyanobacterium diatom dissolved inorganic nitrogen dominance flagellate floodplain growth rate growth response hypothesis testing mesocosm nitrogen fixation nutrient dynamics nutrient limitation phosphorus photosynthesis phytoplankton river basin Parana Basin algae Anabaena Bacillariophyta Chlorophyta Coccoidea Cryptophyta Cyanobacteria Cyclotella meneghiniana Euglenida Mastigophora (flagellates)
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_10151621_v72_n2_p179_Unrein
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_10151621_v72_n2_p179_Unrein
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spelling	todo:paper_10151621_v72_n2_p179_Unrein2023-10-03T15:56:18Z Phytoplankton response to pH rise in a N-limited floodplain lake: Relevance of N2-fixing heterocystous cyanobacteria Unrein, F. O'Farrell, I. Izaguirre, I. Sinistro, R. dos Santos Afonso, M. Tell, G. N2-fixing cyanobacteria pH Phytoplankton community composition cyanobacterium diatom dissolved inorganic nitrogen dominance flagellate floodplain growth rate growth response hypothesis testing mesocosm nitrogen fixation nutrient dynamics nutrient limitation pH phosphorus photosynthesis phytoplankton river basin Parana Basin algae Anabaena Bacillariophyta Chlorophyta Coccoidea Cryptophyta Cyanobacteria Cyclotella meneghiniana Euglenida Mastigophora (flagellates) Phosphorus has been traditionally regarded as the controlling nutrient for phytoplankton growth, however, N-limitation is likely to occur in several environments. For example, nitrogen is considered the main nutrient limiting phytoplankton in floodplain lakes of the Paraná River basin. However, N2-fixing heterocystous cyanobacteria (N2-cyano) are usually absent in these water bodies. The low pH values frequently found may limit the development of these algae. We hypothesise that long-term lake isolation allows conspicuous phytoplankton growth during summer, resulting in high photosynthetic rates and pH. This scenario combined with low DIN (dissolved inorganic nitrogen) would favour the development of N2-cyano. Phytoplankton composition was studied during 16 months in a vegetated and isolated floodplain lake in the Paraná basin. Additionally, pH was artificially increased in in situ mesocosms to test effects on phytoplankton structure. Lake phytoplankton was dominated by flagellates (cryptophytes and euglenophytes) and small coccoid algae (chlorophytes and colonial cyanobacteria). Algal biomass was highest during warm periods. Although pH increased up to 8.8 during the second summer period, N2-cyano remained rare, most likely because of the high DIN concentration recorded. The alkalophilic diatom Cyclotella meneghiniana dominated and was positively correlated with pH. Conversely, PO4= concentrations in the mesocosm experiment were high and DIN remained relatively low. pH enhancement in the treated mesocosms (avg. pH = 8.2) promoted the development of N2-cyano (Anabaena spp.) and C. meneghiniana, which after 1 month of incubation accounted together for 50% of the biomass in contrast to less than 1.6% in control containers. Our results support the hypothesis that during the warm season and under low DIN concentration, high pH favours N2-cyano growth in these lakes. We provide new evidence supporting the idea that even under optimal nutrient conditions, N2-cyano do not thrive unless other requirements are satisfied. © Birkhäuser Verlag, Basel/Switzerland 2009. Fil:Unrein, F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:O'Farrell, I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Izaguirre, I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Sinistro, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10151621_v72_n2_p179_Unrein
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	N2-fixing cyanobacteria pH Phytoplankton community composition cyanobacterium diatom dissolved inorganic nitrogen dominance flagellate floodplain growth rate growth response hypothesis testing mesocosm nitrogen fixation nutrient dynamics nutrient limitation pH phosphorus photosynthesis phytoplankton river basin Parana Basin algae Anabaena Bacillariophyta Chlorophyta Coccoidea Cryptophyta Cyanobacteria Cyclotella meneghiniana Euglenida Mastigophora (flagellates)
spellingShingle	N2-fixing cyanobacteria pH Phytoplankton community composition cyanobacterium diatom dissolved inorganic nitrogen dominance flagellate floodplain growth rate growth response hypothesis testing mesocosm nitrogen fixation nutrient dynamics nutrient limitation pH phosphorus photosynthesis phytoplankton river basin Parana Basin algae Anabaena Bacillariophyta Chlorophyta Coccoidea Cryptophyta Cyanobacteria Cyclotella meneghiniana Euglenida Mastigophora (flagellates) Unrein, F. O'Farrell, I. Izaguirre, I. Sinistro, R. dos Santos Afonso, M. Tell, G. Phytoplankton response to pH rise in a N-limited floodplain lake: Relevance of N2-fixing heterocystous cyanobacteria
topic_facet	N2-fixing cyanobacteria pH Phytoplankton community composition cyanobacterium diatom dissolved inorganic nitrogen dominance flagellate floodplain growth rate growth response hypothesis testing mesocosm nitrogen fixation nutrient dynamics nutrient limitation pH phosphorus photosynthesis phytoplankton river basin Parana Basin algae Anabaena Bacillariophyta Chlorophyta Coccoidea Cryptophyta Cyanobacteria Cyclotella meneghiniana Euglenida Mastigophora (flagellates)
description	Phosphorus has been traditionally regarded as the controlling nutrient for phytoplankton growth, however, N-limitation is likely to occur in several environments. For example, nitrogen is considered the main nutrient limiting phytoplankton in floodplain lakes of the Paraná River basin. However, N2-fixing heterocystous cyanobacteria (N2-cyano) are usually absent in these water bodies. The low pH values frequently found may limit the development of these algae. We hypothesise that long-term lake isolation allows conspicuous phytoplankton growth during summer, resulting in high photosynthetic rates and pH. This scenario combined with low DIN (dissolved inorganic nitrogen) would favour the development of N2-cyano. Phytoplankton composition was studied during 16 months in a vegetated and isolated floodplain lake in the Paraná basin. Additionally, pH was artificially increased in in situ mesocosms to test effects on phytoplankton structure. Lake phytoplankton was dominated by flagellates (cryptophytes and euglenophytes) and small coccoid algae (chlorophytes and colonial cyanobacteria). Algal biomass was highest during warm periods. Although pH increased up to 8.8 during the second summer period, N2-cyano remained rare, most likely because of the high DIN concentration recorded. The alkalophilic diatom Cyclotella meneghiniana dominated and was positively correlated with pH. Conversely, PO4= concentrations in the mesocosm experiment were high and DIN remained relatively low. pH enhancement in the treated mesocosms (avg. pH = 8.2) promoted the development of N2-cyano (Anabaena spp.) and C. meneghiniana, which after 1 month of incubation accounted together for 50% of the biomass in contrast to less than 1.6% in control containers. Our results support the hypothesis that during the warm season and under low DIN concentration, high pH favours N2-cyano growth in these lakes. We provide new evidence supporting the idea that even under optimal nutrient conditions, N2-cyano do not thrive unless other requirements are satisfied. © Birkhäuser Verlag, Basel/Switzerland 2009.
format	JOUR
author	Unrein, F. O'Farrell, I. Izaguirre, I. Sinistro, R. dos Santos Afonso, M. Tell, G.
author_facet	Unrein, F. O'Farrell, I. Izaguirre, I. Sinistro, R. dos Santos Afonso, M. Tell, G.
author_sort	Unrein, F.
title	Phytoplankton response to pH rise in a N-limited floodplain lake: Relevance of N2-fixing heterocystous cyanobacteria
title_short	Phytoplankton response to pH rise in a N-limited floodplain lake: Relevance of N2-fixing heterocystous cyanobacteria
title_full	Phytoplankton response to pH rise in a N-limited floodplain lake: Relevance of N2-fixing heterocystous cyanobacteria
title_fullStr	Phytoplankton response to pH rise in a N-limited floodplain lake: Relevance of N2-fixing heterocystous cyanobacteria
title_full_unstemmed	Phytoplankton response to pH rise in a N-limited floodplain lake: Relevance of N2-fixing heterocystous cyanobacteria
title_sort	phytoplankton response to ph rise in a n-limited floodplain lake: relevance of n2-fixing heterocystous cyanobacteria
url	http://hdl.handle.net/20.500.12110/paper_10151621_v72_n2_p179_Unrein
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Phytoplankton response to pH rise in a N-limited floodplain lake: Relevance of N2-fixing heterocystous cyanobacteria

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