Seasonal variation in consumption of benthic bacteria by meio- and macrofauna in an intertidal mudflat
International audience The trophic fate of benthic bacteria in an intertidal mudflat (Brouage, Marennes-Oléron, France) was evaluated in situ, and environmental parameters that potentially influence the consumption of bacteria by the most abundant organisms of the meio- and macrofauna were identifie...
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ftunivrochelle:oai:HAL:hal-00525685v1 2024-02-11T10:06:40+01:00 Seasonal variation in consumption of benthic bacteria by meio- and macrofauna in an intertidal mudflat Pascal, Pierre-Yves Dupuy, Christine Richard, Pierre Mallet, Clarisse Du Chatelet E., Armynot Niquil, Nathalie Department of Biological Sciences Baton Rouge Louisiana State University (LSU) LIttoral ENvironnement et Sociétés (LIENSs) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) Laboratoire Microorganismes : Génome et Environnement (LMGE) Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université d'Auvergne - Clermont-Ferrand I (UdA)-Centre National de la Recherche Scientifique (CNRS) Géosystèmes - UMR 8157 Université de Lille, Sciences et Technologies-Centre National de la Recherche Scientifique (CNRS) 2009 https://hal.science/hal-00525685 en eng HAL CCSD Association for the Sciences of Limnology and Oceanography hal-00525685 https://hal.science/hal-00525685 ISSN: 0024-3590 EISSN: 1939-5590 Limnology and Oceanography https://hal.science/hal-00525685 Limnology and Oceanography, 2009, pp.1048-1059 Protozoa Marine environment Europe Atlantic Ocean North Atlantic Fauna Foraminifera Invertebrata France Bay of Biscay Food web Zoobenthos Macrofauna Meiofauna Bacteria Food intake Seasonal variation [SDV.EE]Life Sciences [q-bio]/Ecology environment info:eu-repo/semantics/article Journal articles 2009 ftunivrochelle 2024-01-23T23:33:59Z International audience The trophic fate of benthic bacteria in an intertidal mudflat (Brouage, Marennes-Oléron, France) was evaluated in situ, and environmental parameters that potentially influence the consumption of bacteria by the most abundant organisms of the meio- and macrofauna were identified. Variations in grazing rates were estimated using 15N pre-enriched bacteria at different temporal and spatial scales on a cross-shore transect over the mudflat. Grazing incubations were performed in microcosms with freshly collected grazers. Environmental factors varied more by season than by day or sampling station. Bacterial uptake by grazers did not appear to be strongly influenced by abiotic factors and was not linked to bacterial abundance. Algal abundance was negatively correlated with bacterivory in both the nematode community and the foraminifer Ammonia tepida, suggesting that bacteria constitute an alternative resource that is consumed when algae are less abundant. Bacteria were mainly ingested by the mudsnail Hydrobia ulvae and secondarily by nematodes with grazing rates of copepods and A. tepida being considerably lower. The estimated grazing in the upper and middle part of the mudflat represented 7% and 28% of bacterial production, respectively. In the lower mudflat, daily grazing never represented >3% of bacterial production throughout the year. Consequently, grazing appears to be a minor factor in the regulation of bacterial production. Bacterivory did not vary clearly according to season; consequently, the fate of bacteria in this benthic food web is poorly structured by season. Article in Journal/Newspaper North Atlantic Copepods HAL - Université de La Rochelle |
institution |
Open Polar |
collection |
HAL - Université de La Rochelle |
op_collection_id |
ftunivrochelle |
language |
English |
topic |
Protozoa Marine environment Europe Atlantic Ocean North Atlantic Fauna Foraminifera Invertebrata France Bay of Biscay Food web Zoobenthos Macrofauna Meiofauna Bacteria Food intake Seasonal variation [SDV.EE]Life Sciences [q-bio]/Ecology environment |
spellingShingle |
Protozoa Marine environment Europe Atlantic Ocean North Atlantic Fauna Foraminifera Invertebrata France Bay of Biscay Food web Zoobenthos Macrofauna Meiofauna Bacteria Food intake Seasonal variation [SDV.EE]Life Sciences [q-bio]/Ecology environment Pascal, Pierre-Yves Dupuy, Christine Richard, Pierre Mallet, Clarisse Du Chatelet E., Armynot Niquil, Nathalie Seasonal variation in consumption of benthic bacteria by meio- and macrofauna in an intertidal mudflat |
topic_facet |
Protozoa Marine environment Europe Atlantic Ocean North Atlantic Fauna Foraminifera Invertebrata France Bay of Biscay Food web Zoobenthos Macrofauna Meiofauna Bacteria Food intake Seasonal variation [SDV.EE]Life Sciences [q-bio]/Ecology environment |
description |
International audience The trophic fate of benthic bacteria in an intertidal mudflat (Brouage, Marennes-Oléron, France) was evaluated in situ, and environmental parameters that potentially influence the consumption of bacteria by the most abundant organisms of the meio- and macrofauna were identified. Variations in grazing rates were estimated using 15N pre-enriched bacteria at different temporal and spatial scales on a cross-shore transect over the mudflat. Grazing incubations were performed in microcosms with freshly collected grazers. Environmental factors varied more by season than by day or sampling station. Bacterial uptake by grazers did not appear to be strongly influenced by abiotic factors and was not linked to bacterial abundance. Algal abundance was negatively correlated with bacterivory in both the nematode community and the foraminifer Ammonia tepida, suggesting that bacteria constitute an alternative resource that is consumed when algae are less abundant. Bacteria were mainly ingested by the mudsnail Hydrobia ulvae and secondarily by nematodes with grazing rates of copepods and A. tepida being considerably lower. The estimated grazing in the upper and middle part of the mudflat represented 7% and 28% of bacterial production, respectively. In the lower mudflat, daily grazing never represented >3% of bacterial production throughout the year. Consequently, grazing appears to be a minor factor in the regulation of bacterial production. Bacterivory did not vary clearly according to season; consequently, the fate of bacteria in this benthic food web is poorly structured by season. |
author2 |
Department of Biological Sciences Baton Rouge Louisiana State University (LSU) LIttoral ENvironnement et Sociétés (LIENSs) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) Laboratoire Microorganismes : Génome et Environnement (LMGE) Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université d'Auvergne - Clermont-Ferrand I (UdA)-Centre National de la Recherche Scientifique (CNRS) Géosystèmes - UMR 8157 Université de Lille, Sciences et Technologies-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Pascal, Pierre-Yves Dupuy, Christine Richard, Pierre Mallet, Clarisse Du Chatelet E., Armynot Niquil, Nathalie |
author_facet |
Pascal, Pierre-Yves Dupuy, Christine Richard, Pierre Mallet, Clarisse Du Chatelet E., Armynot Niquil, Nathalie |
author_sort |
Pascal, Pierre-Yves |
title |
Seasonal variation in consumption of benthic bacteria by meio- and macrofauna in an intertidal mudflat |
title_short |
Seasonal variation in consumption of benthic bacteria by meio- and macrofauna in an intertidal mudflat |
title_full |
Seasonal variation in consumption of benthic bacteria by meio- and macrofauna in an intertidal mudflat |
title_fullStr |
Seasonal variation in consumption of benthic bacteria by meio- and macrofauna in an intertidal mudflat |
title_full_unstemmed |
Seasonal variation in consumption of benthic bacteria by meio- and macrofauna in an intertidal mudflat |
title_sort |
seasonal variation in consumption of benthic bacteria by meio- and macrofauna in an intertidal mudflat |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.science/hal-00525685 |
genre |
North Atlantic Copepods |
genre_facet |
North Atlantic Copepods |
op_source |
ISSN: 0024-3590 EISSN: 1939-5590 Limnology and Oceanography https://hal.science/hal-00525685 Limnology and Oceanography, 2009, pp.1048-1059 |
op_relation |
hal-00525685 https://hal.science/hal-00525685 |
_version_ |
1790604508355624960 |