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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ftunibueairesbd:todo:paper_07224060_v32_n3_p493_Allende 2023-10-29T02:32:28+01:00 Combined effects of nutrients and grazers on bacterioplankton and phytoplankton abundance in an Antarctic lake with even food-chain links Allende, L. https://hdl.handle.net/20.500.12110/paper_07224060_v32_n3_p493_Allende unknown http://hdl.handle.net/20.500.12110/paper_07224060_v32_n3_p493_Allende info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Antarctica Bacterioplankton Bottom-up Phytoplankton Top-down abundance bottom-up control food chain grazing lake nutrient availability top-down control JOUR ftunibueairesbd https://doi.org/20.500.12110/paper_07224060_v32_n3_p493_Allende 2023-10-05T01:32:01Z 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. Journal/Newspaper Antarc* Antarctic Antarctica Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
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Open Polar |
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Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
op_collection_id |
ftunibueairesbd |
language |
unknown |
topic |
Antarctica Bacterioplankton Bottom-up Phytoplankton Top-down abundance bottom-up control food chain grazing lake nutrient availability top-down control |
spellingShingle |
Antarctica Bacterioplankton Bottom-up Phytoplankton Top-down abundance bottom-up control food chain grazing lake nutrient availability top-down control 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 bottom-up control food chain grazing lake nutrient availability top-down control |
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. Fil:Allende, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. |
format |
Journal/Newspaper |
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 |
https://hdl.handle.net/20.500.12110/paper_07224060_v32_n3_p493_Allende |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
http://hdl.handle.net/20.500.12110/paper_07224060_v32_n3_p493_Allende |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar |
op_doi |
https://doi.org/20.500.12110/paper_07224060_v32_n3_p493_Allende |
_version_ |
1781053946659340288 |