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Growth performances of juvenile sole Solea solea under environmental constraints of embayed nursery areas ArchiMer
Laffargue, Pascal; Lagardere, Francoise; Rijnsdorp, Adriaan D.; Fillon, Alain; Amara, Rachid.
Les baies du golfe de Gascogne (France) hébergent des habitats où la sole, Solea solea, est le plus abondant des poissons plats. Cette étude vise à évaluer le fonctionnement des habitats pour leur rôle de nourriceries, en analysant la croissance et la condition des juvéniles de sole pendant leur première année. Les données de deux séries, 1999 et 2000, de chalutages mensuels sont comparées à celles acquises lors d'une expérience de 6 mois en mésocosme impliquant l'élevage de poissons originaires de la même nourricerie. La croissance observée est comparée à la croissance potentielle, en utilisant un modèle expérimental décrivant la croissance en fonction de la température. Les soles du groupe d'âge 0 capturées dans la nourricerie atteignent une taille...
Tipo: Text Palavras-chave: Solea solea; Flatfish; Mesocosm experiment; Condition factor; Growth; 0 group fish; Habitat quality; Coastal nursery.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2928.pdf
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Limiting nutrients of oyster pond seawater in the Marennes-Oleron region for Haslea ostrearia : applications to the mass production of the diatom in mesocosom experiments ArchiMer
Turpin, Vincent; Robert, Jean-michel; Goulletquer, Philippe.
Bioassays were carried out with the 'blue diatom' Haslea ostrearia Simonsen, which is responsible for oyster greening during the fattening period of Crassostrea gigas Thunberg in oyster ponds. Samples of seawater were taken from two oyster ponds: one without oysters and the other with 20 oysters per m_, maximal density allowed by the French AFNOR norm for 'refinement'. The aims were to clarify the nutrient requirements of this diatom, also to elucidate the eventual influence of C. gigas at this density on the seawater fertility and to envisage the mass production of this diatom by pond fertilization. Examination of cell numeric densities at the end of bioassays allows us to conclude that silicate was the first limiting nutrient, closely followed by...
Tipo: Text Palavras-chave: Marennes Oleron; Oyster ponds; Mesocosm experiment; Bioassay; Haslea ostrearia; Bacillariophyceae; Limiting nutrients; Marennes Oléron; Claires à huîtres; Expérience en mésocosmes; Bioessai; Haslea ostrearia; Bacillariophyceae; Nutriments limitants.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/publication-3096.pdf
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Stimulation of nitrogen-fixing cyanobacteria in a Baltic Sea plankton community by land-derived organic matter or iron addition ArchiMer
Stolte, Willem; Balode, Maija; Carlsson, Per; Grzebyk, Daniel; Janson, Sven; Lips, Inga; Panosso, Renata; Ward, Clive J.; Graneli, Edna.
In the Baltic Sea, floating blooms of nitrogen-fixing cyanobacteria occur yearly during late summer. These blooms can sometimes be limited by iron. Due to extensive foresting around the Baltic Sea, iron is entering the Baltic Sea partly bound to dissolved organic material (DOM) via rivers. An experiment was performed in 300 1 laboratory mesocosms to test the hypothesis that riverine high-molecular weight dissolved organic matter (HMWDOM), extracted by tangential flow filtration > 1000 Da, stimulates the biomass of nitrogen-fixing cyanobacteria, by increasing the availability of iron. The addition of iron/EDTA and of DOM resulted in 5 to 10 times higher biomass of nitrogen-fixing cyanobacteria. Accordingly, higher primary production and particulate...
Tipo: Text Palavras-chave: Mesocosm experiment; Humic acid; HMWDOM; High molecular weight dissolved organic matter; Iron; Nitrogen fixation; Cyanobacteria.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2470.pdf
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