Uptake of nitrate by phytoplankton in two different marine environments in the province of Chubut (42°-46°S, Argentina)

The spatio-temporal distribution of nutrients and primary production processes are fundamental to understand the functioning of marine ecosystems. In this regard, the quantification of the new and regenerated primary production is highly relevant. In this work, the new production was estimated from...

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Autores principales: Paparazzo, F.E., Farias, L., Santinelli, N., Alder, V.A., Esteves, J.L.
Formato: JOUR
Materias:
Argentina
Chlorophyll-a
Inorganic nutrients
New production
Phytoplankton
Stable isotopes
chlorophyll a
marine environment
nitrate
nutrient uptake
phytoplankton
primary production
stable isotope
Bahia Nueva
Chubut
Golfo Nuevo
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_07173326_v48_n3_p591_Paparazzo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_07173326_v48_n3_p591_Paparazzo
record_format dspace
spelling todo:paper_07173326_v48_n3_p591_Paparazzo2023-10-03T15:36:22Z Uptake of nitrate by phytoplankton in two different marine environments in the province of Chubut (42°-46°S, Argentina) Paparazzo, F.E. Farias, L. Santinelli, N. Alder, V.A. Esteves, J.L. Argentina Chlorophyll-a Inorganic nutrients New production Phytoplankton Stable isotopes chlorophyll a marine environment nitrate nutrient uptake phytoplankton primary production stable isotope Argentina Bahia Nueva Chubut Golfo Nuevo The spatio-temporal distribution of nutrients and primary production processes are fundamental to understand the functioning of marine ecosystems. In this regard, the quantification of the new and regenerated primary production is highly relevant. In this work, the new production was estimated from the measurement of the uptake of nitrate by the phytoplankton by incubating samples enriched with stable isotopes of nitrogen (15NO3) together with the measurement of temperature, salinity, pH, chlorophyll-a and the measure of the cell abundance of the major phytoplankton groups. The experiments were carried out in cape Dos Bahías (CBD) (46°S) (open water environment without anthropogenic influence and depths greater than 50 m) and Bahía Nueva (BN) (42°S) (semi-enclosed sea environment with possible anthropogenic influence and depths less than 10 m). Temperature, salinity and pH were similar in the 2 analyzed ecosystems. The average concentration of nitrate, phosphate and silicate in BN was 0.19 ± 0.12 μM, 0.85 ± 0.09 μM and 1.77 ± 0.23 μM respectively. Comparatively, nitrate and silicate concentration in CDB was higher (0.86 ± 1.28 μM and 3.69 ± 1.07 μM respectively), while the phosphate concentration showed lower values (0.66 ± 0.20 μM). The concentration of chlorophyll-a was not associated with the nitrate uptake. In CBD, dinoflagellates and cryptophytes were the dominant groups and their abundance was positively correlated with the uptake of nitrate. In BN the diatoms dominated and were not associated with this parameter. We conclude that the new production in surface waters was similar for both environments and higher than in the subsurface layer. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_07173326_v48_n3_p591_Paparazzo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Argentina
Chlorophyll-a
Inorganic nutrients
New production
Phytoplankton
Stable isotopes
chlorophyll a
marine environment
nitrate
nutrient uptake
phytoplankton
primary production
stable isotope
Argentina
Bahia Nueva
Chubut
Golfo Nuevo
spellingShingle Argentina
Chlorophyll-a
Inorganic nutrients
New production
Phytoplankton
Stable isotopes
chlorophyll a
marine environment
nitrate
nutrient uptake
phytoplankton
primary production
stable isotope
Argentina
Bahia Nueva
Chubut
Golfo Nuevo
Paparazzo, F.E.
Farias, L.
Santinelli, N.
Alder, V.A.
Esteves, J.L.
Uptake of nitrate by phytoplankton in two different marine environments in the province of Chubut (42°-46°S, Argentina)
topic_facet Argentina
Chlorophyll-a
Inorganic nutrients
New production
Phytoplankton
Stable isotopes
chlorophyll a
marine environment
nitrate
nutrient uptake
phytoplankton
primary production
stable isotope
Argentina
Bahia Nueva
Chubut
Golfo Nuevo
description The spatio-temporal distribution of nutrients and primary production processes are fundamental to understand the functioning of marine ecosystems. In this regard, the quantification of the new and regenerated primary production is highly relevant. In this work, the new production was estimated from the measurement of the uptake of nitrate by the phytoplankton by incubating samples enriched with stable isotopes of nitrogen (15NO3) together with the measurement of temperature, salinity, pH, chlorophyll-a and the measure of the cell abundance of the major phytoplankton groups. The experiments were carried out in cape Dos Bahías (CBD) (46°S) (open water environment without anthropogenic influence and depths greater than 50 m) and Bahía Nueva (BN) (42°S) (semi-enclosed sea environment with possible anthropogenic influence and depths less than 10 m). Temperature, salinity and pH were similar in the 2 analyzed ecosystems. The average concentration of nitrate, phosphate and silicate in BN was 0.19 ± 0.12 μM, 0.85 ± 0.09 μM and 1.77 ± 0.23 μM respectively. Comparatively, nitrate and silicate concentration in CDB was higher (0.86 ± 1.28 μM and 3.69 ± 1.07 μM respectively), while the phosphate concentration showed lower values (0.66 ± 0.20 μM). The concentration of chlorophyll-a was not associated with the nitrate uptake. In CBD, dinoflagellates and cryptophytes were the dominant groups and their abundance was positively correlated with the uptake of nitrate. In BN the diatoms dominated and were not associated with this parameter. We conclude that the new production in surface waters was similar for both environments and higher than in the subsurface layer.
format JOUR
author Paparazzo, F.E.
Farias, L.
Santinelli, N.
Alder, V.A.
Esteves, J.L.
author_facet Paparazzo, F.E.
Farias, L.
Santinelli, N.
Alder, V.A.
Esteves, J.L.
author_sort Paparazzo, F.E.
title Uptake of nitrate by phytoplankton in two different marine environments in the province of Chubut (42°-46°S, Argentina)
title_short Uptake of nitrate by phytoplankton in two different marine environments in the province of Chubut (42°-46°S, Argentina)
title_full Uptake of nitrate by phytoplankton in two different marine environments in the province of Chubut (42°-46°S, Argentina)
title_fullStr Uptake of nitrate by phytoplankton in two different marine environments in the province of Chubut (42°-46°S, Argentina)
title_full_unstemmed Uptake of nitrate by phytoplankton in two different marine environments in the province of Chubut (42°-46°S, Argentina)
title_sort uptake of nitrate by phytoplankton in two different marine environments in the province of chubut (42°-46°s, argentina)
url http://hdl.handle.net/20.500.12110/paper_07173326_v48_n3_p591_Paparazzo
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AT estevesjl uptakeofnitratebyphytoplanktonintwodifferentmarineenvironmentsintheprovinceofchubut4246sargentina
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