Seasonal changes in biomass, growth rates and production of subantarctic calanoid copepods in the Bay of Morbihan, Kerguelen Islands
12 pages International audience The present study addresses the ecology of two dominant copepod species in the Bay of Morbihan, Kerguelen Archipelago. The biomass of the herbivore Drepanopus pectinatus (from 2 mg m)3 in winter up to 500 mg m)3 in summer) is tightly coupled to seasonal changes in chl...
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Online Access: | https://hal.science/hal-00189197 https://doi.org/10.1007/s00227-002-0976-5 |
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ftunivrochelle:oai:HAL:hal-00189197v1 2024-02-11T09:56:09+01:00 Seasonal changes in biomass, growth rates and production of subantarctic calanoid copepods in the Bay of Morbihan, Kerguelen Islands Alonzo, F. Mayzaud, Patrick Razouls, Suzanne Bocher, Pierrick Cherel, Yves Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Observatoire océanologique de Banyuls (OOB) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Centre de Recherche sur les Ecosystèmes Littoraux Anthropisés (CRELA) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) Centre d'Études Biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) 2003 https://hal.science/hal-00189197 https://doi.org/10.1007/s00227-002-0976-5 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00227-002-0976-5 hal-00189197 https://hal.science/hal-00189197 doi:10.1007/s00227-002-0976-5 ISSN: 0025-3162 EISSN: 1432-1793 Marine Biology https://hal.science/hal-00189197 Marine Biology, 2003, 142, pp.525-536. ⟨10.1007/s00227-002-0976-5⟩ [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environment and Society [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2003 ftunivrochelle https://doi.org/10.1007/s00227-002-0976-5 2024-01-23T23:35:21Z 12 pages International audience The present study addresses the ecology of two dominant copepod species in the Bay of Morbihan, Kerguelen Archipelago. The biomass of the herbivore Drepanopus pectinatus (from 2 mg m)3 in winter up to 500 mg m)3 in summer) is tightly coupled to seasonal changes in chlorophyll a concentration in the region, whereas the biomass of the predatory euchaetiid Paraeuchaeta antarctica increases during two distinct periods over the year: 250 mg m)3 in early summer, with the recruitment of the annual generation, and 100 mg m)3 in autumn, with the deposition of lipids as energy reserves in C5 stages and adults. The juvenile growth rates predicted by temperature-dependent models (0.09 day)1) closely approximate those observed in D. pectinatusin summer, but are much greater than those observed in P. antarctica (from 0.001 to 0.04 day)1 depending on developmental stages). This difference can be explained by the reproductive strategies and trophic positions of the two species and may also result from the dependence of larval growth on energy reserves in P. antarctica. The production rates are five- and tenfold greater in juvenile stages than in adults, respectively, for D. pectinatus and P. antarctica. The secondary production by D. pectinatusis insufficient to support P. antarctica during winter, when the predatory species probably shifts to alternate prey. In summer the predation by P. antarctica accounts for only a minor part of the mortality estimated for D. pectinatus (from 20% to 60% depending on the examined station). At two of the three stations examined in the Bay of Morbihan, the production of P. antarctica could potentially support the dietary requirements of planktivorous seabirds in the region (2,000 kg prey day)1 for common diving petrels, Pelecanoides urinatrix, and 90 kg prey day)1 for rockhopper penguins, Eudyptes chysocome filholi). Article in Journal/Newspaper Antarc* Antarctica Kerguelen Islands Copepods HAL - Université de La Rochelle Kerguelen Kerguelen Islands Marine Biology 142 3 525 536 |
institution |
Open Polar |
collection |
HAL - Université de La Rochelle |
op_collection_id |
ftunivrochelle |
language |
English |
topic |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environment and Society [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environment and Society [SDE.MCG]Environmental Sciences/Global Changes Alonzo, F. Mayzaud, Patrick Razouls, Suzanne Bocher, Pierrick Cherel, Yves Seasonal changes in biomass, growth rates and production of subantarctic calanoid copepods in the Bay of Morbihan, Kerguelen Islands |
topic_facet |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environment and Society [SDE.MCG]Environmental Sciences/Global Changes |
description |
12 pages International audience The present study addresses the ecology of two dominant copepod species in the Bay of Morbihan, Kerguelen Archipelago. The biomass of the herbivore Drepanopus pectinatus (from 2 mg m)3 in winter up to 500 mg m)3 in summer) is tightly coupled to seasonal changes in chlorophyll a concentration in the region, whereas the biomass of the predatory euchaetiid Paraeuchaeta antarctica increases during two distinct periods over the year: 250 mg m)3 in early summer, with the recruitment of the annual generation, and 100 mg m)3 in autumn, with the deposition of lipids as energy reserves in C5 stages and adults. The juvenile growth rates predicted by temperature-dependent models (0.09 day)1) closely approximate those observed in D. pectinatusin summer, but are much greater than those observed in P. antarctica (from 0.001 to 0.04 day)1 depending on developmental stages). This difference can be explained by the reproductive strategies and trophic positions of the two species and may also result from the dependence of larval growth on energy reserves in P. antarctica. The production rates are five- and tenfold greater in juvenile stages than in adults, respectively, for D. pectinatus and P. antarctica. The secondary production by D. pectinatusis insufficient to support P. antarctica during winter, when the predatory species probably shifts to alternate prey. In summer the predation by P. antarctica accounts for only a minor part of the mortality estimated for D. pectinatus (from 20% to 60% depending on the examined station). At two of the three stations examined in the Bay of Morbihan, the production of P. antarctica could potentially support the dietary requirements of planktivorous seabirds in the region (2,000 kg prey day)1 for common diving petrels, Pelecanoides urinatrix, and 90 kg prey day)1 for rockhopper penguins, Eudyptes chysocome filholi). |
author2 |
Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Observatoire océanologique de Banyuls (OOB) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Centre de Recherche sur les Ecosystèmes Littoraux Anthropisés (CRELA) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) Centre d'Études Biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Alonzo, F. Mayzaud, Patrick Razouls, Suzanne Bocher, Pierrick Cherel, Yves |
author_facet |
Alonzo, F. Mayzaud, Patrick Razouls, Suzanne Bocher, Pierrick Cherel, Yves |
author_sort |
Alonzo, F. |
title |
Seasonal changes in biomass, growth rates and production of subantarctic calanoid copepods in the Bay of Morbihan, Kerguelen Islands |
title_short |
Seasonal changes in biomass, growth rates and production of subantarctic calanoid copepods in the Bay of Morbihan, Kerguelen Islands |
title_full |
Seasonal changes in biomass, growth rates and production of subantarctic calanoid copepods in the Bay of Morbihan, Kerguelen Islands |
title_fullStr |
Seasonal changes in biomass, growth rates and production of subantarctic calanoid copepods in the Bay of Morbihan, Kerguelen Islands |
title_full_unstemmed |
Seasonal changes in biomass, growth rates and production of subantarctic calanoid copepods in the Bay of Morbihan, Kerguelen Islands |
title_sort |
seasonal changes in biomass, growth rates and production of subantarctic calanoid copepods in the bay of morbihan, kerguelen islands |
publisher |
HAL CCSD |
publishDate |
2003 |
url |
https://hal.science/hal-00189197 https://doi.org/10.1007/s00227-002-0976-5 |
geographic |
Kerguelen Kerguelen Islands |
geographic_facet |
Kerguelen Kerguelen Islands |
genre |
Antarc* Antarctica Kerguelen Islands Copepods |
genre_facet |
Antarc* Antarctica Kerguelen Islands Copepods |
op_source |
ISSN: 0025-3162 EISSN: 1432-1793 Marine Biology https://hal.science/hal-00189197 Marine Biology, 2003, 142, pp.525-536. ⟨10.1007/s00227-002-0976-5⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00227-002-0976-5 hal-00189197 https://hal.science/hal-00189197 doi:10.1007/s00227-002-0976-5 |
op_doi |
https://doi.org/10.1007/s00227-002-0976-5 |
container_title |
Marine Biology |
container_volume |
142 |
container_issue |
3 |
container_start_page |
525 |
op_container_end_page |
536 |
_version_ |
1790600934042107904 |