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| Roux, Pauline; Siano, Raffaele; Collin, Karine; Bilien, Gwenael; Sinquin, Corinne; Marchand, Laetitia; Zykwinska, Agata; Delbarre-ladrat, Christine; Schapira, Mathilde. |
| High biomasses of the marine dinoflagellate Lepidodinium chlorophorum cause green seawater discolorations along Southern Brittany (NE Atlantic, France). The viscosity associated to these phenomena has been related to problems in oyster cultivation. The harmful effect of L. chlorophorum might originate from the secretion of Extracellular Polymeric Substances (EPS). To understand whether the EPS are produced by L. chlorophorum or its associated bacteria, or if they are a product of their interaction, batch cultures were performed under non-axenic and pseudo-axenic conditions for three strains. Maximum dinoflagellate cell abundances were observed in pseudo-axenic cultures. The non-sinking fraction of polymers (Soluble Extracellular Polymers, SEP), mainly... |
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| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00682/79403/81948.pdf |
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| Roux, Pauline. |
| Small pelagic fish schools are increasingly observed near the sea surface (0-30 m depth) during the PELGAS survey in the Bay of Biscay in spring. These surface schools are likely under-sampled by R/V Thalassa vertical echosounders,as they are located in the sounders' acoustic blind zone. They are however better observed by the vessel lateral echosounder, which samples the 0-10 m depth layer. In this study, we characterise the dimensions, density and distributions of some surface schools observed during the PELGAS2016 survey, by combining vertical and lateral echosounders data. The implications of the presence of the surface schools in terms of small pelagic fish biomass assessment are discussed. |
| Tipo: Text |
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| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00393/50399/51114.pdf |
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| Georges Des Aulnois, Maxime; Roux, Pauline; Caruana, Amandine; Réveillon, Damien; Briand, Enora; Hervé, Fabienne; Savar, Veronique; Bormans, Myriam; Amzil, Zouher; Atomi, Haruyuki. |
| Proliferation of microcystin (MC)-producing Microcystis aeruginosa in brackish waters has been described in several locations and represents a new concern for public and environmental health. While the impact of a sudden salinity increase on M. aeruginosa physiology has been studied, less is known about the mechanisms involved in salt tolerance after acclimation. This study aims to compare the physiological responses of two strains of M. aeruginosa (PCC 7820 and PCC 7806), which were isolated from contrasted environments, to increasing salinities. After acclimation, growth and MC production rates were determined and metabolomic analyses were conducted. For both strains, salinity decreased the biovolume, growth, and MC production rates and induced the... |
| Tipo: Text |
Palavras-chave: Acclimation; Metabolomic; Microcystis; Salinity; Sucrose; Trehalose; Ecophysiology. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00588/70031/68012.pdf |
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| Cochennec-laureau, Nathalie; Bellec, Gwenael; Bizzozero, Lucie; Bonneau, Francoise; Bouget, Jean-francois; Bouvier, Calypso; Collin, Karine; Fortune, Mireille; Gabellec, Raoul; Le Merrer, Yoann; Manach, Soazig; Mellor, Alice; Pierre-duplessix, Olivier; Reboul, Sebastien; Retho, Michael; Roux, Pauline; Schapira, Mathilde; Schmitt, Anne; Souchu, Philippe; Stanisiere, Jean-yves. |
| Activités d’observation, de surveillance de la qualité des eaux littorales du Morbihan, Pays de Loire et Nord Vendée et résultats des projets de recherche 2018 |
| Tipo: Text |
Palavras-chave: Réseaux de surveillance et d’observation; Qualité des écosystèmes marins littoraux du Morbihan; Pays de Loire; Microbiologie; Phytoplancton; Eutrophisation; Ressources exploitées; Huîtres; Moules. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00481/59245/61969.pdf |
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| Cochennec-laureau, Nathalie; Bizzozero, Lucie; Bonneau, Francoise; Bouget, Jean-francois; Bouvier, Calypso; Collin, Karine; Fortune, Mireille; Gabellec, Raoul; Le Merrer, Yoann; Manach, Soazig; Pierre-duplessix, Olivier; Retho, Michael; Roux, Pauline; Schapira, Mathilde; Schmitt, Anne; Souchu, Philippe; Stanisiere, Jean-yves; Villedieu, Anouk. |
| Activités d’observation, de surveillance de la qualité des eaux littorales du Morbihan, Pays de la Loire et Nord Vendée et résultats des projets de recherche 2019 |
| Tipo: Text |
Palavras-chave: Réseaux de surveillance et d’observation; Qualité des écosystèmes marins littoraux du Morbihan; Pays de la Loire; Microbiologie; Phytoplancton; Eutrophisation; Ressources exploitées; Huîtres; Moules. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00630/74217/73849.pdf |
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