Combined effects of nutrients and grazers on bacterioplankton and phytoplankton abundance in an Antarctic lake with even food-chain links

The goal of this study was to address the top-down and bottom-up controls on different microbial web components (bacterioplankton, picophytoplankton, and >3 μm phytoplankton) in an Antarctic lake. Two experiments using a size fractionation approach and nutrient addition were conducted at microcos...

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Detalles Bibliográficos
Autor principal: Allende, L.
Formato: JOUR
Materias:
Antarctica
Bacterioplankton
Bottom-up
Phytoplankton
Top-down
abundance
bacterioplankton
bottom-up control
food chain
grazing
lake
nutrient availability
phytoplankton
top-down control
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_07224060_v32_n3_p493_Allende
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_07224060_v32_n3_p493_Allende
record_format dspace
spelling todo:paper_07224060_v32_n3_p493_Allende2023-10-03T15:37:05Z Combined effects of nutrients and grazers on bacterioplankton and phytoplankton abundance in an Antarctic lake with even food-chain links Allende, L. Antarctica Bacterioplankton Bottom-up Phytoplankton Top-down abundance bacterioplankton bottom-up control food chain grazing lake nutrient availability phytoplankton top-down control Antarctica The goal of this study was to address the top-down and bottom-up controls on different microbial web components (bacterioplankton, picophytoplankton, and >3 μm phytoplankton) in an Antarctic lake. Two experiments using a size fractionation approach and nutrient addition were conducted at microcosm scale (2.5 l). The variation in net growth rates (k') of bacterioplankton and phytoplankton size fractions was analyzed after 5 days. The results determined significant differences; whereas bacterioplankton and large phytoplankton showed an increase in their k' when their predators were removed, the picophytoplankton showed a decrease. All the studied plankton components presented the highest k' when nutrients were added. It is suggested that, in this lake, both the top-down and bottom-up regulations account for the regulation of bacterioplankton and large phytoplankton. As for picophytoplankton, the bottom-up control was evident and grazing did not pose a negative impact and rather, had a positive effect probably due to liberation of nutrients. © 2008 Springer-Verlag. Fil:Allende, L. 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_v32_n3_p493_Allende
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
Bacterioplankton
Bottom-up
Phytoplankton
Top-down
abundance
bacterioplankton
bottom-up control
food chain
grazing
lake
nutrient availability
phytoplankton
top-down control
Antarctica
spellingShingle Antarctica
Bacterioplankton
Bottom-up
Phytoplankton
Top-down
abundance
bacterioplankton
bottom-up control
food chain
grazing
lake
nutrient availability
phytoplankton
top-down control
Antarctica
Allende, L.
Combined effects of nutrients and grazers on bacterioplankton and phytoplankton abundance in an Antarctic lake with even food-chain links
topic_facet Antarctica
Bacterioplankton
Bottom-up
Phytoplankton
Top-down
abundance
bacterioplankton
bottom-up control
food chain
grazing
lake
nutrient availability
phytoplankton
top-down control
Antarctica
description The goal of this study was to address the top-down and bottom-up controls on different microbial web components (bacterioplankton, picophytoplankton, and >3 μm phytoplankton) in an Antarctic lake. Two experiments using a size fractionation approach and nutrient addition were conducted at microcosm scale (2.5 l). The variation in net growth rates (k') of bacterioplankton and phytoplankton size fractions was analyzed after 5 days. The results determined significant differences; whereas bacterioplankton and large phytoplankton showed an increase in their k' when their predators were removed, the picophytoplankton showed a decrease. All the studied plankton components presented the highest k' when nutrients were added. It is suggested that, in this lake, both the top-down and bottom-up regulations account for the regulation of bacterioplankton and large phytoplankton. As for picophytoplankton, the bottom-up control was evident and grazing did not pose a negative impact and rather, had a positive effect probably due to liberation of nutrients. © 2008 Springer-Verlag.
format JOUR
author Allende, L.
author_facet Allende, L.
author_sort Allende, L.
title Combined effects of nutrients and grazers on bacterioplankton and phytoplankton abundance in an Antarctic lake with even food-chain links
title_short Combined effects of nutrients and grazers on bacterioplankton and phytoplankton abundance in an Antarctic lake with even food-chain links
title_full Combined effects of nutrients and grazers on bacterioplankton and phytoplankton abundance in an Antarctic lake with even food-chain links
title_fullStr Combined effects of nutrients and grazers on bacterioplankton and phytoplankton abundance in an Antarctic lake with even food-chain links
title_full_unstemmed Combined effects of nutrients and grazers on bacterioplankton and phytoplankton abundance in an Antarctic lake with even food-chain links
title_sort combined effects of nutrients and grazers on bacterioplankton and phytoplankton abundance in an antarctic lake with even food-chain links
url http://hdl.handle.net/20.500.12110/paper_07224060_v32_n3_p493_Allende
work_keys_str_mv AT allendel combinedeffectsofnutrientsandgrazersonbacterioplanktonandphytoplanktonabundanceinanantarcticlakewithevenfoodchainlinks
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