Phytoplankton structure and dynamics in a turbid Antarctic lake (Potter Peninsula, King George Island)

Qualitative and quantitative changes in the freshwater phytoplankton from one of the largest lakes in Potter Peninsula were studied during the summer period of 1995/1996. The main limnological features were analysed. This research constitutes the first study dealing with the phytoplankton structure...

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Autores principales: Unrein, F., Vinocur, A.
Formato: JOUR
Materias:
biological parameters
marine environment
pH
phosphorus
population structure
principal component analysis
lake
phytoplankton
population dynamics
Antarctica
Achnanthes lanceolata
Hydrurus foetidus
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_07224060_v22_n2_p93_Unrein
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_07224060_v22_n2_p93_Unrein2023-10-03T15:36:55Z Phytoplankton structure and dynamics in a turbid Antarctic lake (Potter Peninsula, King George Island) Unrein, F. Vinocur, A. biological parameters marine environment pH phosphorus population structure principal component analysis lake phytoplankton population dynamics population structure Antarctica Achnanthes lanceolata Hydrurus foetidus Qualitative and quantitative changes in the freshwater phytoplankton from one of the largest lakes in Potter Peninsula were studied during the summer period of 1995/1996. The main limnological features were analysed. This research constitutes the first study dealing with the phytoplankton structure and dynamics from lakes in Potter Peninsula. Due to the mixing of the water column by the constant wind action during the ice-free period, neither physical, chemical nor biological parameters showed differences between depths. Soluble reactive phosphorus remained low (26 μg l-1) while total phosphorus concentrations were up to 232 μg l-1. Suspended solids and total phosphorus differed significantly between the two basins in which the lake is divided. Sixty-five taxa were identified. The Bacillariophyceae was the dominant class followed by Chrysophyceae. Achnanthes lanceolata var. haynaldii and Hydrurus foetidus (cysts) were the dominant species. Tychoplanktonic species were the best represented in terms of abundance and species richness. The principal component analysis carried out with abiotic variables showed a temporal gradient characterised by the augmentation of suspended solids, total phosphorus, conductivity, pH and NH4-N to the end of the summer period. The Principal Component Analysis performed with biotic variables also showed a temporal trend related to a decline in phytoplankton density and an enhancement of chlorophyll-a despite a slight increase of light limitation during the study period. This inverse relation may be due to the presence of picoplankton in chlorophyll-a samples. The potential effect of grazing on the phytoplankton structure is a subject to be tested in future studies. Fil:Unrein, F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vinocur, A. 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_07224060_v22_n2_p93_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 biological parameters
marine environment
pH
phosphorus
population structure
principal component analysis
lake
phytoplankton
population dynamics
population structure
Antarctica
Achnanthes lanceolata
Hydrurus foetidus
spellingShingle biological parameters
marine environment
pH
phosphorus
population structure
principal component analysis
lake
phytoplankton
population dynamics
population structure
Antarctica
Achnanthes lanceolata
Hydrurus foetidus
Unrein, F.
Vinocur, A.
Phytoplankton structure and dynamics in a turbid Antarctic lake (Potter Peninsula, King George Island)
topic_facet biological parameters
marine environment
pH
phosphorus
population structure
principal component analysis
lake
phytoplankton
population dynamics
population structure
Antarctica
Achnanthes lanceolata
Hydrurus foetidus
description Qualitative and quantitative changes in the freshwater phytoplankton from one of the largest lakes in Potter Peninsula were studied during the summer period of 1995/1996. The main limnological features were analysed. This research constitutes the first study dealing with the phytoplankton structure and dynamics from lakes in Potter Peninsula. Due to the mixing of the water column by the constant wind action during the ice-free period, neither physical, chemical nor biological parameters showed differences between depths. Soluble reactive phosphorus remained low (26 μg l-1) while total phosphorus concentrations were up to 232 μg l-1. Suspended solids and total phosphorus differed significantly between the two basins in which the lake is divided. Sixty-five taxa were identified. The Bacillariophyceae was the dominant class followed by Chrysophyceae. Achnanthes lanceolata var. haynaldii and Hydrurus foetidus (cysts) were the dominant species. Tychoplanktonic species were the best represented in terms of abundance and species richness. The principal component analysis carried out with abiotic variables showed a temporal gradient characterised by the augmentation of suspended solids, total phosphorus, conductivity, pH and NH4-N to the end of the summer period. The Principal Component Analysis performed with biotic variables also showed a temporal trend related to a decline in phytoplankton density and an enhancement of chlorophyll-a despite a slight increase of light limitation during the study period. This inverse relation may be due to the presence of picoplankton in chlorophyll-a samples. The potential effect of grazing on the phytoplankton structure is a subject to be tested in future studies.
format JOUR
author Unrein, F.
Vinocur, A.
author_facet Unrein, F.
Vinocur, A.
author_sort Unrein, F.
title Phytoplankton structure and dynamics in a turbid Antarctic lake (Potter Peninsula, King George Island)
title_short Phytoplankton structure and dynamics in a turbid Antarctic lake (Potter Peninsula, King George Island)
title_full Phytoplankton structure and dynamics in a turbid Antarctic lake (Potter Peninsula, King George Island)
title_fullStr Phytoplankton structure and dynamics in a turbid Antarctic lake (Potter Peninsula, King George Island)
title_full_unstemmed Phytoplankton structure and dynamics in a turbid Antarctic lake (Potter Peninsula, King George Island)
title_sort phytoplankton structure and dynamics in a turbid antarctic lake (potter peninsula, king george island)
url http://hdl.handle.net/20.500.12110/paper_07224060_v22_n2_p93_Unrein
work_keys_str_mv AT unreinf phytoplanktonstructureanddynamicsinaturbidantarcticlakepotterpeninsulakinggeorgeisland
AT vinocura phytoplanktonstructureanddynamicsinaturbidantarcticlakepotterpeninsulakinggeorgeisland
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