Differential response of benthic macrofauna to the formation of novel oyster reefs (Crassostrea gigas, Thunberg) on soft and rocky substrate in the intertidal of the Bay of Brest, France
International audience When the Pacific oyster (Crassostrea gigas, Thunberg) was introduced into France for aquaculture in the mid-sixties, it was initially confined to the sites where it was farmed. Subsequent global warming most likely facilitated the establishment of wild populations throughout t...
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ftccsdartic:oai:HAL:hal-00818138v1 2023-05-15T15:57:49+02:00 Differential response of benthic macrofauna to the formation of novel oyster reefs (Crassostrea gigas, Thunberg) on soft and rocky substrate in the intertidal of the Bay of Brest, France Lejart, Morgane Hily, Christian 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 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) 2011-01-21 https://hal.univ-brest.fr/hal-00818138 https://doi.org/10.1016/j.seares.2010.07.004 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.seares.2010.07.004 hal-00818138 https://hal.univ-brest.fr/hal-00818138 doi:10.1016/j.seares.2010.07.004 ISSN: 1385-1101 EISSN: 1873-1414 Journal of Sea Research (JSR) https://hal.univ-brest.fr/hal-00818138 Journal of Sea Research (JSR), Elsevier, 2011, 65 (1), pp.84-93. ⟨10.1016/j.seares.2010.07.004⟩ Crassostrea gigas Invasive species Oyster reefs Habitat Intertidal communities [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2011 ftccsdartic https://doi.org/10.1016/j.seares.2010.07.004 2021-12-19T03:18:20Z International audience When the Pacific oyster (Crassostrea gigas, Thunberg) was introduced into France for aquaculture in the mid-sixties, it was initially confined to the sites where it was farmed. Subsequent global warming most likely facilitated the establishment of wild populations throughout the French coastline. This phenomenon of spread has become so great that oyster reefs have recently appeared in sheltered estuaries, on both soft and hard substrate. The present study examined two such sites in the Bay of Brest, Brittany. It is the first to investigate the impacts of this new substrate on the biocoenosis of uncolonised intertidal habitats in France. Increased species richness and abundance of intertidal macrofauna were observed in the presence of oyster reefs on both, mud (4 and 20 fold respectively) and rock (5 fold for both). The dominance of suspension feeders in mud changed to carnivores in reefs and their underlying sediment. Calculation of biotic coefficients (BC) of the soft-bottom fauna revealed only a slight organic enrichment, and the organic and silt composition in the sediment beneath oyster reefs were not significantly different from that on bare sites. On rock, the dominance of grazers remained unchanged between bare rock and oyster reef, while reef on rock was also characterised by deposit and detritic feeders. C. gigas is suspected to cause a homogenisation of coastal habitats with an impoverishment of overall quality but we detected only 11 common species between reefs on mud (60 species) and those on rock (55 species). Article in Journal/Newspaper Crassostrea gigas Pacific oyster Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Bare Rock ENVELOPE(-45.589,-45.589,-60.704,-60.704) Pacific Journal of Sea Research 65 1 84 93 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Crassostrea gigas Invasive species Oyster reefs Habitat Intertidal communities [SDE]Environmental Sciences |
spellingShingle |
Crassostrea gigas Invasive species Oyster reefs Habitat Intertidal communities [SDE]Environmental Sciences Lejart, Morgane Hily, Christian Differential response of benthic macrofauna to the formation of novel oyster reefs (Crassostrea gigas, Thunberg) on soft and rocky substrate in the intertidal of the Bay of Brest, France |
topic_facet |
Crassostrea gigas Invasive species Oyster reefs Habitat Intertidal communities [SDE]Environmental Sciences |
description |
International audience When the Pacific oyster (Crassostrea gigas, Thunberg) was introduced into France for aquaculture in the mid-sixties, it was initially confined to the sites where it was farmed. Subsequent global warming most likely facilitated the establishment of wild populations throughout the French coastline. This phenomenon of spread has become so great that oyster reefs have recently appeared in sheltered estuaries, on both soft and hard substrate. The present study examined two such sites in the Bay of Brest, Brittany. It is the first to investigate the impacts of this new substrate on the biocoenosis of uncolonised intertidal habitats in France. Increased species richness and abundance of intertidal macrofauna were observed in the presence of oyster reefs on both, mud (4 and 20 fold respectively) and rock (5 fold for both). The dominance of suspension feeders in mud changed to carnivores in reefs and their underlying sediment. Calculation of biotic coefficients (BC) of the soft-bottom fauna revealed only a slight organic enrichment, and the organic and silt composition in the sediment beneath oyster reefs were not significantly different from that on bare sites. On rock, the dominance of grazers remained unchanged between bare rock and oyster reef, while reef on rock was also characterised by deposit and detritic feeders. C. gigas is suspected to cause a homogenisation of coastal habitats with an impoverishment of overall quality but we detected only 11 common species between reefs on mud (60 species) and those on rock (55 species). |
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 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) |
format |
Article in Journal/Newspaper |
author |
Lejart, Morgane Hily, Christian |
author_facet |
Lejart, Morgane Hily, Christian |
author_sort |
Lejart, Morgane |
title |
Differential response of benthic macrofauna to the formation of novel oyster reefs (Crassostrea gigas, Thunberg) on soft and rocky substrate in the intertidal of the Bay of Brest, France |
title_short |
Differential response of benthic macrofauna to the formation of novel oyster reefs (Crassostrea gigas, Thunberg) on soft and rocky substrate in the intertidal of the Bay of Brest, France |
title_full |
Differential response of benthic macrofauna to the formation of novel oyster reefs (Crassostrea gigas, Thunberg) on soft and rocky substrate in the intertidal of the Bay of Brest, France |
title_fullStr |
Differential response of benthic macrofauna to the formation of novel oyster reefs (Crassostrea gigas, Thunberg) on soft and rocky substrate in the intertidal of the Bay of Brest, France |
title_full_unstemmed |
Differential response of benthic macrofauna to the formation of novel oyster reefs (Crassostrea gigas, Thunberg) on soft and rocky substrate in the intertidal of the Bay of Brest, France |
title_sort |
differential response of benthic macrofauna to the formation of novel oyster reefs (crassostrea gigas, thunberg) on soft and rocky substrate in the intertidal of the bay of brest, france |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.univ-brest.fr/hal-00818138 https://doi.org/10.1016/j.seares.2010.07.004 |
long_lat |
ENVELOPE(-45.589,-45.589,-60.704,-60.704) |
geographic |
Bare Rock Pacific |
geographic_facet |
Bare Rock Pacific |
genre |
Crassostrea gigas Pacific oyster |
genre_facet |
Crassostrea gigas Pacific oyster |
op_source |
ISSN: 1385-1101 EISSN: 1873-1414 Journal of Sea Research (JSR) https://hal.univ-brest.fr/hal-00818138 Journal of Sea Research (JSR), Elsevier, 2011, 65 (1), pp.84-93. ⟨10.1016/j.seares.2010.07.004⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.seares.2010.07.004 hal-00818138 https://hal.univ-brest.fr/hal-00818138 doi:10.1016/j.seares.2010.07.004 |
op_doi |
https://doi.org/10.1016/j.seares.2010.07.004 |
container_title |
Journal of Sea Research |
container_volume |
65 |
container_issue |
1 |
container_start_page |
84 |
op_container_end_page |
93 |
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1766393525495136256 |