Factors regulating summer phytoplankton in a highly eutrophic Antarctic lake

Lakes from Maritime Antarctica are regarded as systems generally inhabited by metazoan plankton capable of imposing a top-down control on the phytoplankton during short periods, while lakes from Continental Antarctica lacking these communities would be typically controlled by scarcity of nutrients,...

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Detalles Bibliográficos
Autores principales: Mataloni, G., Tesolín, G., Sacullo, F., Tell, G.
Formato: JOUR
Materias:
Antarctica
Ecology
Grazing
Lakes
Phytoplankton
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00188158_v432_n1-3_p65_Mataloni
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00188158_v432_n1-3_p65_Mataloni
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spelling todo:paper_00188158_v432_n1-3_p65_Mataloni2023-10-03T14:15:53Z Factors regulating summer phytoplankton in a highly eutrophic Antarctic lake Mataloni, G. Tesolín, G. Sacullo, F. Tell, G. Antarctica Ecology Grazing Lakes Phytoplankton Lakes from Maritime Antarctica are regarded as systems generally inhabited by metazoan plankton capable of imposing a top-down control on the phytoplankton during short periods, while lakes from Continental Antarctica lacking these communities would be typically controlled by scarcity of nutrients, following a bottom-up model. Otero Lake is a highly eutrophic small lake located on the NW of the Antarctic Peninsula, which has no metazoan plankton. During summer 1996, we studied the density, composition and vertical distribution of the phytoplankton community of this lake with respect to various abiotic variables, yet our results demonstrated neither light nor nutrient limitation of the phytoplankton biomass. Densities of heterotrophic nanoflagellates (HNAN) and ciliates from three different size categories were also studied. Extremely low densities of HNAN (0-155 ind. ml-1) could be due to feeding competition by bacterivore nanociliates and/or predation by large ciliates. A summer bloom of the phytoflagellate Chlamydomonas aff. celerrima Pascher reached densities tenfold those of previous years (158.103 ind. ml-1), though apparently curtailed by a strong peak of large ciliates (107 ind. ml-1) which would heavily graze on PNAN (phototrophic nanoflagellates). Top-down control can thus occur in this lake during short periods of long hydrologic residence time. Fil:Mataloni, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tesolín, G. 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_00188158_v432_n1-3_p65_Mataloni
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Antarctica
Ecology
Grazing
Lakes
Phytoplankton
spellingShingle Antarctica
Ecology
Grazing
Lakes
Phytoplankton
Mataloni, G.
Tesolín, G.
Sacullo, F.
Tell, G.
Factors regulating summer phytoplankton in a highly eutrophic Antarctic lake
topic_facet Antarctica
Ecology
Grazing
Lakes
Phytoplankton
description Lakes from Maritime Antarctica are regarded as systems generally inhabited by metazoan plankton capable of imposing a top-down control on the phytoplankton during short periods, while lakes from Continental Antarctica lacking these communities would be typically controlled by scarcity of nutrients, following a bottom-up model. Otero Lake is a highly eutrophic small lake located on the NW of the Antarctic Peninsula, which has no metazoan plankton. During summer 1996, we studied the density, composition and vertical distribution of the phytoplankton community of this lake with respect to various abiotic variables, yet our results demonstrated neither light nor nutrient limitation of the phytoplankton biomass. Densities of heterotrophic nanoflagellates (HNAN) and ciliates from three different size categories were also studied. Extremely low densities of HNAN (0-155 ind. ml-1) could be due to feeding competition by bacterivore nanociliates and/or predation by large ciliates. A summer bloom of the phytoflagellate Chlamydomonas aff. celerrima Pascher reached densities tenfold those of previous years (158.103 ind. ml-1), though apparently curtailed by a strong peak of large ciliates (107 ind. ml-1) which would heavily graze on PNAN (phototrophic nanoflagellates). Top-down control can thus occur in this lake during short periods of long hydrologic residence time.
format JOUR
author Mataloni, G.
Tesolín, G.
Sacullo, F.
Tell, G.
author_facet Mataloni, G.
Tesolín, G.
Sacullo, F.
Tell, G.
author_sort Mataloni, G.
title Factors regulating summer phytoplankton in a highly eutrophic Antarctic lake
title_short Factors regulating summer phytoplankton in a highly eutrophic Antarctic lake
title_full Factors regulating summer phytoplankton in a highly eutrophic Antarctic lake
title_fullStr Factors regulating summer phytoplankton in a highly eutrophic Antarctic lake
title_full_unstemmed Factors regulating summer phytoplankton in a highly eutrophic Antarctic lake
title_sort factors regulating summer phytoplankton in a highly eutrophic antarctic lake
url http://hdl.handle.net/20.500.12110/paper_00188158_v432_n1-3_p65_Mataloni
work_keys_str_mv AT matalonig factorsregulatingsummerphytoplanktoninahighlyeutrophicantarcticlake
AT tesoling factorsregulatingsummerphytoplanktoninahighlyeutrophicantarcticlake
AT sacullof factorsregulatingsummerphytoplanktoninahighlyeutrophicantarcticlake
AT tellg factorsregulatingsummerphytoplanktoninahighlyeutrophicantarcticlake
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