Copepod grazing during an iron-induced diatom bloom in the Antarctic Circumpolar Current (EisenEx): I. Feeding patterns and grazing impact on prey populations
International audience Feeding activity, selective grazing and the potential grazing impact of two dominant grazers of the Polar Frontal Zone, Calanus simillimus and Rhincalanus gigas, and of copepods < 2 mm were investigated with incubation experiments in the course of an iron fertilized diatom...
Published in: | Journal of Experimental Marine Biology and Ecology |
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Online Access: | https://hal.univ-brest.fr/hal-00473811 https://doi.org/10.1016/j.jembe.2006.06.028 |
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ftinsu:oai:HAL:hal-00473811v1 2024-02-11T09:58:07+01:00 Copepod grazing during an iron-induced diatom bloom in the Antarctic Circumpolar Current (EisenEx): I. Feeding patterns and grazing impact on prey populations Schultes, Sabine Verity, Peter G. Bathmann, Uli Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Skidaway Institute of Oceanography (SIO) Skidaway Institute of Oceanography Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association 2006-10-24 https://hal.univ-brest.fr/hal-00473811 https://doi.org/10.1016/j.jembe.2006.06.028 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jembe.2006.06.028 hal-00473811 https://hal.univ-brest.fr/hal-00473811 doi:10.1016/j.jembe.2006.06.028 ISSN: 0022-0981 Journal of Experimental Marine Biology and Ecology https://hal.univ-brest.fr/hal-00473811 Journal of Experimental Marine Biology and Ecology, 2006, 338 (1), pp.16-34. ⟨10.1016/j.jembe.2006.06.028⟩ copepods diatom mortality grazing selectivity iron fertilization Southern Ocean RHINCALANUS-GIGAS COPEPODA POLAR FRONTAL ZONE SOUTHERN-OCEAN CALANOID COPEPODS ATLANTIC SECTOR MESOZOOPLANKTON COMMUNITY PHYTOPLANKTON BLOOM BELLINGSHAUSEN-SEA AUSTRAL SUMMER SPRING BLOOM [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2006 ftinsu https://doi.org/10.1016/j.jembe.2006.06.028 2024-01-24T17:24:37Z International audience Feeding activity, selective grazing and the potential grazing impact of two dominant grazers of the Polar Frontal Zone, Calanus simillimus and Rhincalanus gigas, and of copepods < 2 mm were investigated with incubation experiments in the course of an iron fertilized diatom bloom in November 2000. All grazers were already actively feeding in the low chlorophyll waters prior to the onset of the bloom. C. simillimus maintained constant clearance rates and fed predominantly on diatoms. R. gigas and the small copepods strongly increased clearance and ingestion of diatoms in response to their enhanced availability. All grazers preyed on microzooplankton, most steadily on ciliates, confirming the view that pure herbivory appears to be the exception rather than the rule in copepod feeding. The grazers exhibited differences in feeding behavior based on selectivity indices. C simillimus and R. gigas showed prey switching from dinoflagellates to diatoms in response to the phytoplankton bloom. All grazers most efficiently grazed on large diatoms leading to differences in daily losses for large and small species, e.g. Corethron sp. or Thalassionema nitzschioides. Species-specific diatom mortality rates due to grazing suggest that the high feeding activity of C simillimus prior to and during the bloom played a role in shaping diatom population dynamics. Article in Journal/Newspaper Antarc* Antarctic Bellingshausen Sea Mesozooplankton Southern Ocean Copepods Institut national des sciences de l'Univers: HAL-INSU Antarctic Southern Ocean The Antarctic Austral Bellingshausen Sea Journal of Experimental Marine Biology and Ecology 338 1 16 34 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
copepods diatom mortality grazing selectivity iron fertilization Southern Ocean RHINCALANUS-GIGAS COPEPODA POLAR FRONTAL ZONE SOUTHERN-OCEAN CALANOID COPEPODS ATLANTIC SECTOR MESOZOOPLANKTON COMMUNITY PHYTOPLANKTON BLOOM BELLINGSHAUSEN-SEA AUSTRAL SUMMER SPRING BLOOM [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
copepods diatom mortality grazing selectivity iron fertilization Southern Ocean RHINCALANUS-GIGAS COPEPODA POLAR FRONTAL ZONE SOUTHERN-OCEAN CALANOID COPEPODS ATLANTIC SECTOR MESOZOOPLANKTON COMMUNITY PHYTOPLANKTON BLOOM BELLINGSHAUSEN-SEA AUSTRAL SUMMER SPRING BLOOM [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Schultes, Sabine Verity, Peter G. Bathmann, Uli Copepod grazing during an iron-induced diatom bloom in the Antarctic Circumpolar Current (EisenEx): I. Feeding patterns and grazing impact on prey populations |
topic_facet |
copepods diatom mortality grazing selectivity iron fertilization Southern Ocean RHINCALANUS-GIGAS COPEPODA POLAR FRONTAL ZONE SOUTHERN-OCEAN CALANOID COPEPODS ATLANTIC SECTOR MESOZOOPLANKTON COMMUNITY PHYTOPLANKTON BLOOM BELLINGSHAUSEN-SEA AUSTRAL SUMMER SPRING BLOOM [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Feeding activity, selective grazing and the potential grazing impact of two dominant grazers of the Polar Frontal Zone, Calanus simillimus and Rhincalanus gigas, and of copepods < 2 mm were investigated with incubation experiments in the course of an iron fertilized diatom bloom in November 2000. All grazers were already actively feeding in the low chlorophyll waters prior to the onset of the bloom. C. simillimus maintained constant clearance rates and fed predominantly on diatoms. R. gigas and the small copepods strongly increased clearance and ingestion of diatoms in response to their enhanced availability. All grazers preyed on microzooplankton, most steadily on ciliates, confirming the view that pure herbivory appears to be the exception rather than the rule in copepod feeding. The grazers exhibited differences in feeding behavior based on selectivity indices. C simillimus and R. gigas showed prey switching from dinoflagellates to diatoms in response to the phytoplankton bloom. All grazers most efficiently grazed on large diatoms leading to differences in daily losses for large and small species, e.g. Corethron sp. or Thalassionema nitzschioides. Species-specific diatom mortality rates due to grazing suggest that the high feeding activity of C simillimus prior to and during the bloom played a role in shaping diatom population dynamics. |
author2 |
Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Skidaway Institute of Oceanography (SIO) Skidaway Institute of Oceanography Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association |
format |
Article in Journal/Newspaper |
author |
Schultes, Sabine Verity, Peter G. Bathmann, Uli |
author_facet |
Schultes, Sabine Verity, Peter G. Bathmann, Uli |
author_sort |
Schultes, Sabine |
title |
Copepod grazing during an iron-induced diatom bloom in the Antarctic Circumpolar Current (EisenEx): I. Feeding patterns and grazing impact on prey populations |
title_short |
Copepod grazing during an iron-induced diatom bloom in the Antarctic Circumpolar Current (EisenEx): I. Feeding patterns and grazing impact on prey populations |
title_full |
Copepod grazing during an iron-induced diatom bloom in the Antarctic Circumpolar Current (EisenEx): I. Feeding patterns and grazing impact on prey populations |
title_fullStr |
Copepod grazing during an iron-induced diatom bloom in the Antarctic Circumpolar Current (EisenEx): I. Feeding patterns and grazing impact on prey populations |
title_full_unstemmed |
Copepod grazing during an iron-induced diatom bloom in the Antarctic Circumpolar Current (EisenEx): I. Feeding patterns and grazing impact on prey populations |
title_sort |
copepod grazing during an iron-induced diatom bloom in the antarctic circumpolar current (eisenex): i. feeding patterns and grazing impact on prey populations |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.univ-brest.fr/hal-00473811 https://doi.org/10.1016/j.jembe.2006.06.028 |
geographic |
Antarctic Southern Ocean The Antarctic Austral Bellingshausen Sea |
geographic_facet |
Antarctic Southern Ocean The Antarctic Austral Bellingshausen Sea |
genre |
Antarc* Antarctic Bellingshausen Sea Mesozooplankton Southern Ocean Copepods |
genre_facet |
Antarc* Antarctic Bellingshausen Sea Mesozooplankton Southern Ocean Copepods |
op_source |
ISSN: 0022-0981 Journal of Experimental Marine Biology and Ecology https://hal.univ-brest.fr/hal-00473811 Journal of Experimental Marine Biology and Ecology, 2006, 338 (1), pp.16-34. ⟨10.1016/j.jembe.2006.06.028⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jembe.2006.06.028 hal-00473811 https://hal.univ-brest.fr/hal-00473811 doi:10.1016/j.jembe.2006.06.028 |
op_doi |
https://doi.org/10.1016/j.jembe.2006.06.028 |
container_title |
Journal of Experimental Marine Biology and Ecology |
container_volume |
338 |
container_issue |
1 |
container_start_page |
16 |
op_container_end_page |
34 |
_version_ |
1790593696962445312 |