Experimental study on the microbial plankton community in a South American wetland (Lower Paraná River Basin) and the effect of the light deficiency due to the floating macrophytes

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An experimental study using microcosms was conducted in a South American wetland, Lower Paraná River Basin (Argentina), to analyse the structure of the components of the microbial plankton community and the influence of the light deficiency due to floating macrophytes on this community. Two experime...

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Autores principales: Sinistro, R., Izaguirre, I., Asikian, V.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2006
Materias:
abundance
bacterium
experimental study
grazing
lacustrine environment
light effect
macrophyte
mesocosm
microbial community
plankton
wetland
Parana Basin
South America
algae
Bacteria (microorganisms)
Ciliophora
Cryptomonas
Cryptomonas erosa
Cryptomonas marssonii
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01427873_v28_n8_p753_Sinistro
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paperaa:paper_01427873_v28_n8_p753_Sinistro
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spelling paperaa:paper_01427873_v28_n8_p753_Sinistro2023-06-12T16:46:39Z Experimental study on the microbial plankton community in a South American wetland (Lower Paraná River Basin) and the effect of the light deficiency due to the floating macrophytes J. Plankton Res. 2006;28(8):753-768 Sinistro, R. Izaguirre, I. Asikian, V. abundance bacterium experimental study grazing lacustrine environment light effect macrophyte mesocosm microbial community plankton wetland Parana Basin South America algae Bacteria (microorganisms) Ciliophora Cryptomonas Cryptomonas erosa Cryptomonas marssonii An experimental study using microcosms was conducted in a South American wetland, Lower Paraná River Basin (Argentina), to analyse the structure of the components of the microbial plankton community and the influence of the light deficiency due to floating macrophytes on this community. Two experiments were run under different light conditions; the decrease of the light penetration due to floating macrophytes was simulated using different nylon mesh covers that resembled natural conditions in the lake. These studies revealed that the light deficiency favoured the replacement of obligate autotrophs by mixotrophic and heterotrophic organisms. Abundances of strictly autotrophic algae along the experiments responded to the light gradient, being maximum in the flasks without cover. Heterotrophic nanoflagellates (HNF) and ciliates increased in the microcosms, probably favoured by the high food availability (picoplankton) and the lack of their predators (zooplankton). The increase of ciliates was higher in the microcosms with more light. In the first experiment, the picoplankton fraction strongly decreased after 24 h in the flasks that included all their potential predators, thus suggesting a grazing pressure on this fraction. Grazing experiments performed with fluorescent-labelled bacteria (FLB) revealed that two Cryptomonas species, which are frequent in the lake (Cryptomonas erosa and Cryptomonas marssonii), can ingest bacteria. © The Author 2006. Published by Oxford University Press. All rights reserved. Fil:Sinistro, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Izaguirre, I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2006 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01427873_v28_n8_p753_Sinistro
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language Inglés
orig_language_str_mv eng
topic abundance
bacterium
experimental study
grazing
lacustrine environment
light effect
macrophyte
mesocosm
microbial community
plankton
wetland
Parana Basin
South America
algae
Bacteria (microorganisms)
Ciliophora
Cryptomonas
Cryptomonas erosa
Cryptomonas marssonii
spellingShingle abundance
bacterium
experimental study
grazing
lacustrine environment
light effect
macrophyte
mesocosm
microbial community
plankton
wetland
Parana Basin
South America
algae
Bacteria (microorganisms)
Ciliophora
Cryptomonas
Cryptomonas erosa
Cryptomonas marssonii
Sinistro, R.
Izaguirre, I.
Asikian, V.
Experimental study on the microbial plankton community in a South American wetland (Lower Paraná River Basin) and the effect of the light deficiency due to the floating macrophytes
topic_facet abundance
bacterium
experimental study
grazing
lacustrine environment
light effect
macrophyte
mesocosm
microbial community
plankton
wetland
Parana Basin
South America
algae
Bacteria (microorganisms)
Ciliophora
Cryptomonas
Cryptomonas erosa
Cryptomonas marssonii
description An experimental study using microcosms was conducted in a South American wetland, Lower Paraná River Basin (Argentina), to analyse the structure of the components of the microbial plankton community and the influence of the light deficiency due to floating macrophytes on this community. Two experiments were run under different light conditions; the decrease of the light penetration due to floating macrophytes was simulated using different nylon mesh covers that resembled natural conditions in the lake. These studies revealed that the light deficiency favoured the replacement of obligate autotrophs by mixotrophic and heterotrophic organisms. Abundances of strictly autotrophic algae along the experiments responded to the light gradient, being maximum in the flasks without cover. Heterotrophic nanoflagellates (HNF) and ciliates increased in the microcosms, probably favoured by the high food availability (picoplankton) and the lack of their predators (zooplankton). The increase of ciliates was higher in the microcosms with more light. In the first experiment, the picoplankton fraction strongly decreased after 24 h in the flasks that included all their potential predators, thus suggesting a grazing pressure on this fraction. Grazing experiments performed with fluorescent-labelled bacteria (FLB) revealed that two Cryptomonas species, which are frequent in the lake (Cryptomonas erosa and Cryptomonas marssonii), can ingest bacteria. © The Author 2006. Published by Oxford University Press. All rights reserved.
format Artículo
Artículo
publishedVersion
author Sinistro, R.
Izaguirre, I.
Asikian, V.
author_facet Sinistro, R.
Izaguirre, I.
Asikian, V.
author_sort Sinistro, R.
title Experimental study on the microbial plankton community in a South American wetland (Lower Paraná River Basin) and the effect of the light deficiency due to the floating macrophytes
title_short Experimental study on the microbial plankton community in a South American wetland (Lower Paraná River Basin) and the effect of the light deficiency due to the floating macrophytes
title_full Experimental study on the microbial plankton community in a South American wetland (Lower Paraná River Basin) and the effect of the light deficiency due to the floating macrophytes
title_fullStr Experimental study on the microbial plankton community in a South American wetland (Lower Paraná River Basin) and the effect of the light deficiency due to the floating macrophytes
title_full_unstemmed Experimental study on the microbial plankton community in a South American wetland (Lower Paraná River Basin) and the effect of the light deficiency due to the floating macrophytes
title_sort experimental study on the microbial plankton community in a south american wetland (lower paraná river basin) and the effect of the light deficiency due to the floating macrophytes
publishDate 2006
url http://hdl.handle.net/20.500.12110/paper_01427873_v28_n8_p753_Sinistro
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AT izaguirrei experimentalstudyonthemicrobialplanktoncommunityinasouthamericanwetlandlowerparanariverbasinandtheeffectofthelightdeficiencyduetothefloatingmacrophytes
AT asikianv experimentalstudyonthemicrobialplanktoncommunityinasouthamericanwetlandlowerparanariverbasinandtheeffectofthelightdeficiencyduetothefloatingmacrophytes
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