Top-down control on plankton components in an Antarctic pond: Experimental approach to the study of low-complexity food webs
In order to address the top-down effect on the different phytoplankton size-fractions and ciliates, a survey at microcosm scale was conducted in a hypertrophic Antarctic pond, testing the hypotheses that (1) the picophytoplankton is regulated by a top-down control exerted by organisms of the bigger...
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ftunibueairesbd:todo:paper_07224060_v29_n10_p893_Allende 2023-10-29T02:32:28+01:00 Top-down control on plankton components in an Antarctic pond: Experimental approach to the study of low-complexity food webs Allende, L. Pizarro, H. https://hdl.handle.net/20.500.12110/paper_07224060_v29_n10_p893_Allende unknown http://hdl.handle.net/20.500.12110/paper_07224060_v29_n10_p893_Allende info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Antarctica Ciliates Phytoplankton Picoplankton Top-down experimental study food web growth rate microplankton nanoplankton top-down control algae Ciliophora JOUR ftunibueairesbd https://doi.org/20.500.12110/paper_07224060_v29_n10_p893_Allende 2023-10-05T01:32:42Z In order to address the top-down effect on the different phytoplankton size-fractions and ciliates, a survey at microcosm scale was conducted in a hypertrophic Antarctic pond, testing the hypotheses that (1) the picophytoplankton is regulated by a top-down control exerted by organisms of the bigger size-fractions, and (2) the nanoplankton fraction (algae and ciliates) is not regulated by a top-down control exerted by the microplankton. The treatments enclosed pond water that was filtered to obtain the different plankton sizes: (a) through 55 μm, (b) 20 μm, and (c) 3 μm pore size filters. The variation in the net growth rate (k′) of the phytoplankton size-fractions and ciliates was analysed after 4 days. The results determined a significant difference (P<0.011) in the k′ value of the picophytoplankton when nano and micro-sized fractions where removed. Conversely, nanophytoplankton and nanociliates were not affected by the removal of bigger size-fractions. We suggest that in this pond the top-down control of the picophytoplankton is relevant, and that the grazing impact is not a key factor in the regulation of the nano-sized (algae and ciliates) plankton components. © Springer-Verlag 2006. Fil:Allende, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pizarro, H. 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) |
institution |
Open Polar |
collection |
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
op_collection_id |
ftunibueairesbd |
language |
unknown |
topic |
Antarctica Ciliates Phytoplankton Picoplankton Top-down experimental study food web growth rate microplankton nanoplankton top-down control algae Ciliophora |
spellingShingle |
Antarctica Ciliates Phytoplankton Picoplankton Top-down experimental study food web growth rate microplankton nanoplankton top-down control algae Ciliophora Allende, L. Pizarro, H. Top-down control on plankton components in an Antarctic pond: Experimental approach to the study of low-complexity food webs |
topic_facet |
Antarctica Ciliates Phytoplankton Picoplankton Top-down experimental study food web growth rate microplankton nanoplankton top-down control algae Ciliophora |
description |
In order to address the top-down effect on the different phytoplankton size-fractions and ciliates, a survey at microcosm scale was conducted in a hypertrophic Antarctic pond, testing the hypotheses that (1) the picophytoplankton is regulated by a top-down control exerted by organisms of the bigger size-fractions, and (2) the nanoplankton fraction (algae and ciliates) is not regulated by a top-down control exerted by the microplankton. The treatments enclosed pond water that was filtered to obtain the different plankton sizes: (a) through 55 μm, (b) 20 μm, and (c) 3 μm pore size filters. The variation in the net growth rate (k′) of the phytoplankton size-fractions and ciliates was analysed after 4 days. The results determined a significant difference (P<0.011) in the k′ value of the picophytoplankton when nano and micro-sized fractions where removed. Conversely, nanophytoplankton and nanociliates were not affected by the removal of bigger size-fractions. We suggest that in this pond the top-down control of the picophytoplankton is relevant, and that the grazing impact is not a key factor in the regulation of the nano-sized (algae and ciliates) plankton components. © Springer-Verlag 2006. Fil:Allende, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pizarro, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. |
format |
Journal/Newspaper |
author |
Allende, L. Pizarro, H. |
author_facet |
Allende, L. Pizarro, H. |
author_sort |
Allende, L. |
title |
Top-down control on plankton components in an Antarctic pond: Experimental approach to the study of low-complexity food webs |
title_short |
Top-down control on plankton components in an Antarctic pond: Experimental approach to the study of low-complexity food webs |
title_full |
Top-down control on plankton components in an Antarctic pond: Experimental approach to the study of low-complexity food webs |
title_fullStr |
Top-down control on plankton components in an Antarctic pond: Experimental approach to the study of low-complexity food webs |
title_full_unstemmed |
Top-down control on plankton components in an Antarctic pond: Experimental approach to the study of low-complexity food webs |
title_sort |
top-down control on plankton components in an antarctic pond: experimental approach to the study of low-complexity food webs |
url |
https://hdl.handle.net/20.500.12110/paper_07224060_v29_n10_p893_Allende |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
http://hdl.handle.net/20.500.12110/paper_07224060_v29_n10_p893_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_v29_n10_p893_Allende |
_version_ |
1781053944437407744 |