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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Detalles Bibliográficos
Autores principales: Allende, L., Pizarro, H.
Formato: JOUR
Materias:
Antarctica
Ciliates
Phytoplankton
Picoplankton
Top-down
experimental study
food web
growth rate
microplankton
nanoplankton
picoplankton
top-down control
algae
Ciliophora
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_07224060_v29_n10_p893_Allende
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_07224060_v29_n10_p893_Allende
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spelling todo:paper_07224060_v29_n10_p893_Allende2023-10-03T15:37:01Z Top-down control on plankton components in an Antarctic pond: Experimental approach to the study of low-complexity food webs Allende, L. Pizarro, H. Antarctica Ciliates Phytoplankton Picoplankton Top-down experimental study food web growth rate microplankton nanoplankton picoplankton top-down control Antarctica algae Ciliophora 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_07224060_v29_n10_p893_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
Ciliates
Phytoplankton
Picoplankton
Top-down
experimental study
food web
growth rate
microplankton
nanoplankton
picoplankton
top-down control
Antarctica
algae
Ciliophora
spellingShingle Antarctica
Ciliates
Phytoplankton
Picoplankton
Top-down
experimental study
food web
growth rate
microplankton
nanoplankton
picoplankton
top-down control
Antarctica
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
picoplankton
top-down control
Antarctica
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.
format JOUR
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 http://hdl.handle.net/20.500.12110/paper_07224060_v29_n10_p893_Allende
work_keys_str_mv AT allendel topdowncontrolonplanktoncomponentsinanantarcticpondexperimentalapproachtothestudyoflowcomplexityfoodwebs
AT pizarroh topdowncontrolonplanktoncomponentsinanantarcticpondexperimentalapproachtothestudyoflowcomplexityfoodwebs
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