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Caractérisation acoustique des bancs de surface dans le Golfe de Gascogne et implication pour l’évaluation de biomasse ArchiMer
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.
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00393/50399/51114.pdf
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Physiological and Metabolic Responses of Freshwater and Brackish-Water Strains of Microcystis aeruginosa Acclimated to a Salinity Gradient: Insight into Salt Tolerance ArchiMer
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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Rapport d'activités 2018 du Laboratoire Environnement Ressources Conchylicoles du Morbihan-Pays de Loire ArchiMer
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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