Grazing by meso- and microzooplankton on phytoplankton in the upper reaches of the Schelde estuary (Belgium/The Netherlands)
In contrast with the marine reaches of estuaries, few studies have dealt with zooplankton grazing on phytoplankton in the upper estuarine reaches, where freshwater zooplankton species tend to dominate the zooplankton community. In spring and early summer 2003, grazing by micro- and mesozooplankton o...
Published in: | Estuarine, Coastal and Shelf Science |
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Format: | Article in Journal/Newspaper |
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Online Access: | http://oatao.univ-toulouse.fr/11577/ http://oatao.univ-toulouse.fr/11577/1/Lionard_11577.pdf https://doi.org/10.1016/j.ecss.2005.04.011 |
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ftunivtoulouseoa:oai:oatao.univ-toulouse.fr:11577 2023-05-15T18:49:44+02:00 Grazing by meso- and microzooplankton on phytoplankton in the upper reaches of the Schelde estuary (Belgium/The Netherlands) Lionard, Marie Azémar, Frédéric Boulêtreau, Stéphanie Muylaert, Koenraad Tackx, Micky Vyverman, Wim Centre National de la Recherche Scientifique - CNRS (FRANCE) Institut National Polytechnique de Toulouse - INPT (FRANCE) Université Toulouse III - Paul Sabatier - UPS (FRANCE) Universiteit Gent - UGENT (BELGIUM) Laboratoire d'Ecologie des Hydrosystèmes - LEH (Toulouse, France) 2005-09 application/pdf http://oatao.univ-toulouse.fr/11577/ http://oatao.univ-toulouse.fr/11577/1/Lionard_11577.pdf https://doi.org/10.1016/j.ecss.2005.04.011 en eng Elsevier http://oatao.univ-toulouse.fr/11577/1/Lionard_11577.pdf HAL : hal-00994572 Lionard, Marie and Azémar, Frédéric and Boulêtreau, Stéphanie and Muylaert, Koenraad and Tackx, Micky and Vyverman, Wim. Grazing by meso- and microzooplankton on phytoplankton in the upper reaches of the Schelde estuary (Belgium/The Netherlands). (2005) Estuarine, Coastal and Shelf Science, 64 (4). 764-774. ISSN 0272-7714 info:eu-repo/semantics/openAccess Ecologie Environnement Schelde estuary Grazing Rotifers Mesozooplankton Phytoplankton HPLC CHEMTAX Article PeerReviewed info:eu-repo/semantics/article 2005 ftunivtoulouseoa https://doi.org/10.1016/j.ecss.2005.04.011 2019-08-29T11:19:40Z In contrast with the marine reaches of estuaries, few studies have dealt with zooplankton grazing on phytoplankton in the upper estuarine reaches, where freshwater zooplankton species tend to dominate the zooplankton community. In spring and early summer 2003, grazing by micro- and mesozooplankton on phytoplankton was investigated at three sites in the upper Schelde estuary. Grazing by mesozooplankton was evaluated by monitoring growth of phytoplankton in 200 μm filtered water in the presence or absence of mesozooplankton. In different experiments, the grazing impact was tested of the calanoïd copepod Eurytemora affinis, the cyclopoid copepods Acanthocyclops robustus and Cyclops vicinus and the cladocera Chydorus sphaericus, Moina affinis and Daphnia magna/pulex. No significant grazing impact of mesozooplankton in any experiment was found despite the fact that mesozooplankton densities used in the experiments (20 or 40 ind. l−1) were higher than densities in the field (0.1–6.9 ind. l−1). Grazing by microzooplankton was evaluated by comparing growth of phytoplankton in 30 and 200 μm filtered water. Microzooplankton in the 30–200 μm size range included mainly rotifers of the genera Brachionus, Trichocerca and Synchaeta, which were present from 191 to 1777 ind. l−1. Microzooplankton had a significant grazing impact in five out of six experiments. They had a community grazing rate of 0.41–1.83 day−1 and grazed up to 84% of initial phytoplankton standing stock per day. Rotifer clearance rates estimated from microzooplankton community grazing rates and rotifer abundances varied from 8.3 to 41.7 μl ind.−1 h−1. CHEMTAX analysis of accessory pigment data revealed a similar phytoplankton community composition after incubation with and without microzooplankton, indicating non-selective feeding by rotifers on phytoplankton. Article in Journal/Newspaper Copepods Rotifer OATAO (Open Archive Toulouse Archive Ouverte - Université de Toulouse) Estuarine, Coastal and Shelf Science 64 4 764 774 |
institution |
Open Polar |
collection |
OATAO (Open Archive Toulouse Archive Ouverte - Université de Toulouse) |
op_collection_id |
ftunivtoulouseoa |
language |
English |
topic |
Ecologie Environnement Schelde estuary Grazing Rotifers Mesozooplankton Phytoplankton HPLC CHEMTAX |
spellingShingle |
Ecologie Environnement Schelde estuary Grazing Rotifers Mesozooplankton Phytoplankton HPLC CHEMTAX Lionard, Marie Azémar, Frédéric Boulêtreau, Stéphanie Muylaert, Koenraad Tackx, Micky Vyverman, Wim Grazing by meso- and microzooplankton on phytoplankton in the upper reaches of the Schelde estuary (Belgium/The Netherlands) |
topic_facet |
Ecologie Environnement Schelde estuary Grazing Rotifers Mesozooplankton Phytoplankton HPLC CHEMTAX |
description |
In contrast with the marine reaches of estuaries, few studies have dealt with zooplankton grazing on phytoplankton in the upper estuarine reaches, where freshwater zooplankton species tend to dominate the zooplankton community. In spring and early summer 2003, grazing by micro- and mesozooplankton on phytoplankton was investigated at three sites in the upper Schelde estuary. Grazing by mesozooplankton was evaluated by monitoring growth of phytoplankton in 200 μm filtered water in the presence or absence of mesozooplankton. In different experiments, the grazing impact was tested of the calanoïd copepod Eurytemora affinis, the cyclopoid copepods Acanthocyclops robustus and Cyclops vicinus and the cladocera Chydorus sphaericus, Moina affinis and Daphnia magna/pulex. No significant grazing impact of mesozooplankton in any experiment was found despite the fact that mesozooplankton densities used in the experiments (20 or 40 ind. l−1) were higher than densities in the field (0.1–6.9 ind. l−1). Grazing by microzooplankton was evaluated by comparing growth of phytoplankton in 30 and 200 μm filtered water. Microzooplankton in the 30–200 μm size range included mainly rotifers of the genera Brachionus, Trichocerca and Synchaeta, which were present from 191 to 1777 ind. l−1. Microzooplankton had a significant grazing impact in five out of six experiments. They had a community grazing rate of 0.41–1.83 day−1 and grazed up to 84% of initial phytoplankton standing stock per day. Rotifer clearance rates estimated from microzooplankton community grazing rates and rotifer abundances varied from 8.3 to 41.7 μl ind.−1 h−1. CHEMTAX analysis of accessory pigment data revealed a similar phytoplankton community composition after incubation with and without microzooplankton, indicating non-selective feeding by rotifers on phytoplankton. |
author2 |
Centre National de la Recherche Scientifique - CNRS (FRANCE) Institut National Polytechnique de Toulouse - INPT (FRANCE) Université Toulouse III - Paul Sabatier - UPS (FRANCE) Universiteit Gent - UGENT (BELGIUM) Laboratoire d'Ecologie des Hydrosystèmes - LEH (Toulouse, France) |
format |
Article in Journal/Newspaper |
author |
Lionard, Marie Azémar, Frédéric Boulêtreau, Stéphanie Muylaert, Koenraad Tackx, Micky Vyverman, Wim |
author_facet |
Lionard, Marie Azémar, Frédéric Boulêtreau, Stéphanie Muylaert, Koenraad Tackx, Micky Vyverman, Wim |
author_sort |
Lionard, Marie |
title |
Grazing by meso- and microzooplankton on phytoplankton in the upper reaches of the Schelde estuary (Belgium/The Netherlands) |
title_short |
Grazing by meso- and microzooplankton on phytoplankton in the upper reaches of the Schelde estuary (Belgium/The Netherlands) |
title_full |
Grazing by meso- and microzooplankton on phytoplankton in the upper reaches of the Schelde estuary (Belgium/The Netherlands) |
title_fullStr |
Grazing by meso- and microzooplankton on phytoplankton in the upper reaches of the Schelde estuary (Belgium/The Netherlands) |
title_full_unstemmed |
Grazing by meso- and microzooplankton on phytoplankton in the upper reaches of the Schelde estuary (Belgium/The Netherlands) |
title_sort |
grazing by meso- and microzooplankton on phytoplankton in the upper reaches of the schelde estuary (belgium/the netherlands) |
publisher |
Elsevier |
publishDate |
2005 |
url |
http://oatao.univ-toulouse.fr/11577/ http://oatao.univ-toulouse.fr/11577/1/Lionard_11577.pdf https://doi.org/10.1016/j.ecss.2005.04.011 |
genre |
Copepods Rotifer |
genre_facet |
Copepods Rotifer |
op_relation |
http://oatao.univ-toulouse.fr/11577/1/Lionard_11577.pdf HAL : hal-00994572 Lionard, Marie and Azémar, Frédéric and Boulêtreau, Stéphanie and Muylaert, Koenraad and Tackx, Micky and Vyverman, Wim. Grazing by meso- and microzooplankton on phytoplankton in the upper reaches of the Schelde estuary (Belgium/The Netherlands). (2005) Estuarine, Coastal and Shelf Science, 64 (4). 764-774. ISSN 0272-7714 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.ecss.2005.04.011 |
container_title |
Estuarine, Coastal and Shelf Science |
container_volume |
64 |
container_issue |
4 |
container_start_page |
764 |
op_container_end_page |
774 |
_version_ |
1766243339888230400 |