Experimental study of the zooplankton impact on the trophic structure of phytoplankton and the microbial assemblages in a temperate wetland (Argentina)
An experimental study using mesocosms was conducted in the main shallow lake of a temperate wetland (Otamendi Natural Reserve, Argentina) to analyse the impact of zooplankton on phytoplankton and the microbial assemblages. The lake is characterised by the presence of a fluctuating cover of floating...
Guardado en:
| Autores principales: | , , , |
|---|---|
| Formato: | Artículo publishedVersion |
| Lenguaje: | Inglés |
| Publicado: |
2007
|
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00759511_v37_n1_p88_Sinistro |
| Aporte de: |
| id |
paperaa:paper_00759511_v37_n1_p88_Sinistro |
|---|---|
| record_format |
dspace |
| spelling |
paperaa:paper_00759511_v37_n1_p88_Sinistro2023-06-12T16:45:52Z Experimental study of the zooplankton impact on the trophic structure of phytoplankton and the microbial assemblages in a temperate wetland (Argentina) Limnologica 2007;37(1):88-99 Sinistro, R. Sánchez, M.L. Marinone, M.C. Izaguirre, I. Microbial communities Phytoplankton Top-down control Trophic cascade Wetlands Zooplankton abundance alga community composition community structure food web lake ecosystem macrophyte microbial community phytoplankton picoplankton trophic structure wetland zooplankton algae Bacillariophyta Calanoida Chlorophyta Ciliophora Copepoda Cyanobacteria Cyclopoida Rotifera An experimental study using mesocosms was conducted in the main shallow lake of a temperate wetland (Otamendi Natural Reserve, Argentina) to analyse the impact of zooplankton on phytoplankton and the microbial assemblages. The lake is characterised by the presence of a fluctuating cover of floating macrophytes, whose shading effects shape the phytoplakton community and the ecosystem functioning, which was absent during the study period. The experiment was run in situ using polyethylene bags, comparing treatments with and without zooplankton. The cascade effect of zooplankton on phytoplankton and the lower levels of the microbial food web (ciliates, heterotrophic nanoflagellates (HNF) and picoplankton) were analysed. A significant zooplankton grazing on the nano-phytoplankton fraction (3-30 μm) was observed. Conversely, large algae (filamentous cyanobacteria, colonial chlorophytes and large diatoms) increased in all mesocosms until day 10, suggesting that they were not actively grazed by zooplankton during this period. However, from day 10 until day 17 this fraction decreased in the enclosures with mesozooplankton, probably due to an increase in the abundance of large herbivores. The results of the experiment would also indicate a trophic cascade effect on the lower levels of the microbial community. In the treatment where zooplankton was removed, the abundance of ciliates followed the same increasing pattern as the abundance of HNF, but with a time lag in its response. In the enclosures without zooplankton, HNF remained relatively constant throughout the experiment, whereas ciliates strongly decrease during the last week. Total picoplankton abundance increased in the enclosures with mesozooplankton, thus supporting the existence of a four-link trophic cascade (copepods-microzooplankton-HNF-picoplankton). Zooplankton composition changed significantly from the beginning until the end of the experiment; cyclopoid nauplii and rotifers were notoriously dominant at t<inf>0</inf>, whereas 10 days later the community showed a more equitable proportion of cyclopoids, calanoids, nauplii, cladocerans and rotifers. © 2006 Elsevier GmbH. All rights reserved. Fil:Sinistro, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Sánchez, M.L. 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. 2007 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_00759511_v37_n1_p88_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 |
Microbial communities Phytoplankton Top-down control Trophic cascade Wetlands Zooplankton abundance alga community composition community structure food web lake ecosystem macrophyte microbial community phytoplankton picoplankton trophic structure wetland zooplankton algae Bacillariophyta Calanoida Chlorophyta Ciliophora Copepoda Cyanobacteria Cyclopoida Rotifera |
| spellingShingle |
Microbial communities Phytoplankton Top-down control Trophic cascade Wetlands Zooplankton abundance alga community composition community structure food web lake ecosystem macrophyte microbial community phytoplankton picoplankton trophic structure wetland zooplankton algae Bacillariophyta Calanoida Chlorophyta Ciliophora Copepoda Cyanobacteria Cyclopoida Rotifera Sinistro, R. Sánchez, M.L. Marinone, M.C. Izaguirre, I. Experimental study of the zooplankton impact on the trophic structure of phytoplankton and the microbial assemblages in a temperate wetland (Argentina) |
| topic_facet |
Microbial communities Phytoplankton Top-down control Trophic cascade Wetlands Zooplankton abundance alga community composition community structure food web lake ecosystem macrophyte microbial community phytoplankton picoplankton trophic structure wetland zooplankton algae Bacillariophyta Calanoida Chlorophyta Ciliophora Copepoda Cyanobacteria Cyclopoida Rotifera |
| description |
An experimental study using mesocosms was conducted in the main shallow lake of a temperate wetland (Otamendi Natural Reserve, Argentina) to analyse the impact of zooplankton on phytoplankton and the microbial assemblages. The lake is characterised by the presence of a fluctuating cover of floating macrophytes, whose shading effects shape the phytoplakton community and the ecosystem functioning, which was absent during the study period. The experiment was run in situ using polyethylene bags, comparing treatments with and without zooplankton. The cascade effect of zooplankton on phytoplankton and the lower levels of the microbial food web (ciliates, heterotrophic nanoflagellates (HNF) and picoplankton) were analysed. A significant zooplankton grazing on the nano-phytoplankton fraction (3-30 μm) was observed. Conversely, large algae (filamentous cyanobacteria, colonial chlorophytes and large diatoms) increased in all mesocosms until day 10, suggesting that they were not actively grazed by zooplankton during this period. However, from day 10 until day 17 this fraction decreased in the enclosures with mesozooplankton, probably due to an increase in the abundance of large herbivores. The results of the experiment would also indicate a trophic cascade effect on the lower levels of the microbial community. In the treatment where zooplankton was removed, the abundance of ciliates followed the same increasing pattern as the abundance of HNF, but with a time lag in its response. In the enclosures without zooplankton, HNF remained relatively constant throughout the experiment, whereas ciliates strongly decrease during the last week. Total picoplankton abundance increased in the enclosures with mesozooplankton, thus supporting the existence of a four-link trophic cascade (copepods-microzooplankton-HNF-picoplankton). Zooplankton composition changed significantly from the beginning until the end of the experiment; cyclopoid nauplii and rotifers were notoriously dominant at t<inf>0</inf>, whereas 10 days later the community showed a more equitable proportion of cyclopoids, calanoids, nauplii, cladocerans and rotifers. © 2006 Elsevier GmbH. All rights reserved. |
| format |
Artículo Artículo publishedVersion |
| author |
Sinistro, R. Sánchez, M.L. Marinone, M.C. Izaguirre, I. |
| author_facet |
Sinistro, R. Sánchez, M.L. Marinone, M.C. Izaguirre, I. |
| author_sort |
Sinistro, R. |
| title |
Experimental study of the zooplankton impact on the trophic structure of phytoplankton and the microbial assemblages in a temperate wetland (Argentina) |
| title_short |
Experimental study of the zooplankton impact on the trophic structure of phytoplankton and the microbial assemblages in a temperate wetland (Argentina) |
| title_full |
Experimental study of the zooplankton impact on the trophic structure of phytoplankton and the microbial assemblages in a temperate wetland (Argentina) |
| title_fullStr |
Experimental study of the zooplankton impact on the trophic structure of phytoplankton and the microbial assemblages in a temperate wetland (Argentina) |
| title_full_unstemmed |
Experimental study of the zooplankton impact on the trophic structure of phytoplankton and the microbial assemblages in a temperate wetland (Argentina) |
| title_sort |
experimental study of the zooplankton impact on the trophic structure of phytoplankton and the microbial assemblages in a temperate wetland (argentina) |
| publishDate |
2007 |
| url |
http://hdl.handle.net/20.500.12110/paper_00759511_v37_n1_p88_Sinistro |
| work_keys_str_mv |
AT sinistror experimentalstudyofthezooplanktonimpactonthetrophicstructureofphytoplanktonandthemicrobialassemblagesinatemperatewetlandargentina AT sanchezml experimentalstudyofthezooplanktonimpactonthetrophicstructureofphytoplanktonandthemicrobialassemblagesinatemperatewetlandargentina AT marinonemc experimentalstudyofthezooplanktonimpactonthetrophicstructureofphytoplanktonandthemicrobialassemblagesinatemperatewetlandargentina AT izaguirrei experimentalstudyofthezooplanktonimpactonthetrophicstructureofphytoplanktonandthemicrobialassemblagesinatemperatewetlandargentina |
| _version_ |
1769810385051844608 |