Zooplankton and their driving factors in a large subtropical river during low water periods
The composition, abundance and functional diversity of zooplankton from the main channel of the Middle Paraná River were studied. Monthly samples were collected in both ordinary drought periods (1977, 1978, 1981, 2007) and extraordinary drought ones (La Niña events 1971–1972, 1999–2000). A constant...
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E Schweizerbartsche Verlags
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ftconicet:oai:ri.conicet.gov.ar:11336/31678 2023-10-09T21:56:31+02:00 Zooplankton and their driving factors in a large subtropical river during low water periods Jose, Susana Beatriz Devercelli, Melina Rojas Molina, Florencia Mercedes application/pdf http://hdl.handle.net/11336/31678 eng eng E Schweizerbartsche Verlags info:eu-repo/semantics/altIdentifier/url/http://www.schweizerbart.de/papers/fal/detail/184/82860/Zooplankton_and_their_driving_factors_in_a_large_subtropical_river_during_low_water_periods?af=search info:eu-repo/semantics/altIdentifier/doi/10.1127/1863-9135/2014/0520 info:eu-repo/semantics/altIdentifier/url/http://www.ingentaconnect.com/content/schweiz/fal/2014/00000184/00000002/art00004 http://hdl.handle.net/11336/31678 Rojas Molina, Florencia Mercedes; Devercelli, Melina; Jose, Susana Beatriz; Zooplankton and their driving factors in a large subtropical river during low water periods; E Schweizerbartsche Verlags; Fundamental and Applied Limnology; 184; 2; 4-2014; 125-139 1863-9135 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ Long-Term Study Microphagous Rotifers Phytoplankton Selective Filter Feeding Cladocerans Zooplankton Abundance https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1127/1863-9135/2014/0520 2023-09-24T18:25:00Z The composition, abundance and functional diversity of zooplankton from the main channel of the Middle Paraná River were studied. Monthly samples were collected in both ordinary drought periods (1977, 1978, 1981, 2007) and extraordinary drought ones (La Niña events 1971–1972, 1999–2000). A constant pattern of zooplankton structure was recorded from 1971 to 1981 characterised by a strong rotifer dominance. Changes were observed in the last two periods, with the planktonic larvae of Limnoperna fortunei as a new component of zooplankton. The abundance of zooplankton showed a significant interannual variability and a decreasing trend over time with the maximum values almost 100 times lower from 1999 onwards, mainly resulting from a decline in rotifer density. Cladocerans and copepods occurred with very low abundance and were similar across years. Bosmina and Bosminopsis showed a decreasing trend through time. Evidence was found of intrazooplanktonic competition between rotifers and cladocerans. Zooplankton and phytoplankton abundance presented similar trends, but the edible algal fraction (< 20 μm) showed a negative relation with Bosminidae, suggesting cladoceran control. In the last period, zooplankton changes were not associated with physical parameters (except flow velocity), nutrients or phytoplankton. The absence of a constant pattern and the causes of the declining trend of zooplankton abundance over time could be related to biotic interactions and multiple-stressors throughout the study. Fil: Jose, Susana Beatriz. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas. Escuela Superior de Sanidad; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentina Fil: Devercelli, Melina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional ... Article in Journal/Newspaper Copepods Rotifer CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Argentina Fundamental and Applied Limnology 184 2 125 139 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
Long-Term Study Microphagous Rotifers Phytoplankton Selective Filter Feeding Cladocerans Zooplankton Abundance https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
spellingShingle |
Long-Term Study Microphagous Rotifers Phytoplankton Selective Filter Feeding Cladocerans Zooplankton Abundance https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 Jose, Susana Beatriz Devercelli, Melina Rojas Molina, Florencia Mercedes Zooplankton and their driving factors in a large subtropical river during low water periods |
topic_facet |
Long-Term Study Microphagous Rotifers Phytoplankton Selective Filter Feeding Cladocerans Zooplankton Abundance https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
description |
The composition, abundance and functional diversity of zooplankton from the main channel of the Middle Paraná River were studied. Monthly samples were collected in both ordinary drought periods (1977, 1978, 1981, 2007) and extraordinary drought ones (La Niña events 1971–1972, 1999–2000). A constant pattern of zooplankton structure was recorded from 1971 to 1981 characterised by a strong rotifer dominance. Changes were observed in the last two periods, with the planktonic larvae of Limnoperna fortunei as a new component of zooplankton. The abundance of zooplankton showed a significant interannual variability and a decreasing trend over time with the maximum values almost 100 times lower from 1999 onwards, mainly resulting from a decline in rotifer density. Cladocerans and copepods occurred with very low abundance and were similar across years. Bosmina and Bosminopsis showed a decreasing trend through time. Evidence was found of intrazooplanktonic competition between rotifers and cladocerans. Zooplankton and phytoplankton abundance presented similar trends, but the edible algal fraction (< 20 μm) showed a negative relation with Bosminidae, suggesting cladoceran control. In the last period, zooplankton changes were not associated with physical parameters (except flow velocity), nutrients or phytoplankton. The absence of a constant pattern and the causes of the declining trend of zooplankton abundance over time could be related to biotic interactions and multiple-stressors throughout the study. Fil: Jose, Susana Beatriz. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas. Escuela Superior de Sanidad; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentina Fil: Devercelli, Melina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional ... |
format |
Article in Journal/Newspaper |
author |
Jose, Susana Beatriz Devercelli, Melina Rojas Molina, Florencia Mercedes |
author_facet |
Jose, Susana Beatriz Devercelli, Melina Rojas Molina, Florencia Mercedes |
author_sort |
Jose, Susana Beatriz |
title |
Zooplankton and their driving factors in a large subtropical river during low water periods |
title_short |
Zooplankton and their driving factors in a large subtropical river during low water periods |
title_full |
Zooplankton and their driving factors in a large subtropical river during low water periods |
title_fullStr |
Zooplankton and their driving factors in a large subtropical river during low water periods |
title_full_unstemmed |
Zooplankton and their driving factors in a large subtropical river during low water periods |
title_sort |
zooplankton and their driving factors in a large subtropical river during low water periods |
publisher |
E Schweizerbartsche Verlags |
url |
http://hdl.handle.net/11336/31678 |
geographic |
Argentina |
geographic_facet |
Argentina |
genre |
Copepods Rotifer |
genre_facet |
Copepods Rotifer |
op_relation |
info:eu-repo/semantics/altIdentifier/url/http://www.schweizerbart.de/papers/fal/detail/184/82860/Zooplankton_and_their_driving_factors_in_a_large_subtropical_river_during_low_water_periods?af=search info:eu-repo/semantics/altIdentifier/doi/10.1127/1863-9135/2014/0520 info:eu-repo/semantics/altIdentifier/url/http://www.ingentaconnect.com/content/schweiz/fal/2014/00000184/00000002/art00004 http://hdl.handle.net/11336/31678 Rojas Molina, Florencia Mercedes; Devercelli, Melina; Jose, Susana Beatriz; Zooplankton and their driving factors in a large subtropical river during low water periods; E Schweizerbartsche Verlags; Fundamental and Applied Limnology; 184; 2; 4-2014; 125-139 1863-9135 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1127/1863-9135/2014/0520 |
container_title |
Fundamental and Applied Limnology |
container_volume |
184 |
container_issue |
2 |
container_start_page |
125 |
op_container_end_page |
139 |
_version_ |
1779321334371713024 |