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| Rayssac, Nathalie; Malet, Nathalie; Pernet, Fabrice. |
| The objective of this work is to understand why oysters Crassostrea gigas shows low settlement success in the Thau lagoon despite the fact that biomass of adults is elevated and that larvae show normal development in the water column. Our hypotheses are that oysters compete for food or space with other filter-feeders animals such as sponges, ascidians and other bivalves. To test the trophic hypothesis, we analysed the entire settler community harvested on four-month-old collectors deployed in the Thau lagoon during the summer 2009 for stable isotopes and fatty acids. Based on the isotopic, crustacean amphipods and barnacles can be rejected as a potential food competitor of juvenile oysters. However, other bivalves such as Mytilus sp., Anomia sp., and... |
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| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00015/12665/9555.pdf |
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| Rayssac, Nathalie; Pérignon, Adeline; Gervasoni, Erika; Pernet, Fabrice; Legall, Patrick; Lagarde, Franck. |
| INTRODUCTION - PRONAMED 2010-2011- Ce projet, initié le Comité Régional de Conchyliculture de Méditerranée (CRCM) et l’Ifremer a été mis en œuvre grâce à la collaboration du CRCM, du Cépralmar ainsi que du réseau VELYGER et du laboratoire environnement ressources du Languedoc Roussillon (LER-LR) de l’Ifremer. En outre, ce projet local a bénéficié de fonds d’état dans le cadre du programme de soutien à l’innovation dans la filière pêche et aquaculture proposé par FranceAgrimer, de fonds européens via le Fond d’Étude pour les Pêches, et de fonds publics locaux grâce aux subventions de la région Languedoc Roussillon et du conseil général de l’Hérault. PRÉAMBULE - La version initiale du projet PRONAMED comportait deux volets de recherche. Le premier, consacré... |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00088/19959/17626.pdf |
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| Rayssac, Nathalie; Pernet, Fabrice; Lacasse, Olivia; Tremblay, Rejean. |
| Temperature is a major factor contributing to the biogeography of intertidal poikilotherms. The population dynamics of intertidal invertebrates like mussels are strongly dependent on larval supply and larval mortality. Unlike adults, which are resistant to fluctuating environmental conditions, larvae are highly sensitive to the physicochemical conditions of the pelagic zone. The effects of rearing temperature on larval and post-larval performance of 2 coexisting mussels species, Mytilus edulis and M. trossulus, were examined in this study. In the first experiment, larvae of both species were reared separately at constant temperatures of 10, 17, and 24 degrees C from D-larvae to the dissoconch stage. In the second experiment, pediveligers were reared under... |
| Tipo: Text |
Palavras-chave: Thermal adaptation; Bivalve mollusk; Selection; Biogeography; Lipid; Larval ecology. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00019/13028/10159.pdf |
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