Consulta: subjectFacets:"N 15"
Registros recuperados: 2
Data/hora: 06/06/2024 00:49:53

Difference of mercury bioaccumulation in red mullets from the north-western Mediterranean and Black seas
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Harmelin-vivien, M.; Cossa, Daniel; Crochet, Sylvette; Banaru, D.; Letourneur, Y.; Mellon-duval, Capucine.
The relationships between total mercury (Hg) concentration and stable nitrogen isotope ratio (delta N-15) were evaluated in Mullus barbatus barbatus and M. surmuletus from the Mediterranean Sea and M. barbatus ponticus from the Black Sea. Mercury concentration in fish muscle was six times higher in the two Mediterranean species than in the Black Sea one for similar sized animals. A positive correlation between Hg concentration and delta N-15 occurred in all species. Increase in Hg concentration with delta N-15 was high and similar in the two Mediterranean fishes and much lower in the Black Sea species. Since this was neither related to trophic level difference between species nor to methylmercury (MeHg) concentration differences between the north-western...
Tipo: Text
Palavras-chave: Black Sea; Mediterranean; Mullidae; Methylmercury; Trophic level; N 15.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6647.pdf

NH4+ turnover in intertidal sediments of Marennes-Oleron Bay (France): effect of sediment temperature
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Vouve, Florence; Guiraud, Gérard; Marol, Christine; Girard, Marine; Richard, Pierre; Laima, Mario.
NH4+ turnover plays an important role in benthic compartment as source of nutrient for primary production. The intertidal mudflats of the Marennes-Oleron Bay are characterized by high fluctuations of sediment temperature that generally ranges from 10 to 30 degreesC during emersion periods. Influence of sediment temperature on NH4+ processes was investigated. Grass ammonification and NH4+ incorporation kinetics were studied using the N-15 isotope dilution method. The method was first adapted to these very fine sediments and applied to 2 upper sediment layers (0-2 and 2-4 cm) at different incubation times of up to 120 h. The effect of sediment temperature on gross ammonification and NH4+ incorporation rates was investigated at 10, 20 and 30 degreesC. There...
Tipo: Text
Palavras-chave: N 15; Intertidal sediments; Sediment temperature; NH4+ turnover; 15N; Sédiments intertidaux; Température du sédiment; Régénération du NH4 +.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-530.pdf