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Higueras, M..-- 40th CIESM Congress: The largest Forum on Mediterranean and Black Sea Research, 28 October - 1 November 2013, Marseille, France, In the Mediterranean basin, marine storms, often associated with flash floods of coastal rivers, are episodic and intense physical processes that are capable of transferring terrestrial organic matter to the continental shelf and up to the deep sea by strong bottom currents along submarine canyons. In order to study accurately a such event, an oceanographic cruise (CASCADE) was performed in the Gulf of Lion (NW Mediterranean Sea) in winter 2011. Two mooring lines equipped with a near-bottom sediment trap (25 m above bottom) were deployed at 290m and 365m water depth on the southern flank of the Cap de Creus Canyon. In order to characterize and to assess the origin of the particulate matter fluxes, the total mass flux, amino acids, opal, particulate organic carbon (POC) , as well as its stable isotopic ratio (d13C) were determined.

40th CIESM Congress: The largest Forum on Mediterranean and Black Sea Research, 28 October - 1 November 2013, Marseille, France.-- 1 page, 1 figure, Un suivi multiparamétrique de 8 mois sur une station côtière (golfe du Lion, Méditerranée Nord occidentale) permet de décrire la variabilité saisonnière de la matière organique dissoute colorée (CDOM) et de préciser son origine et son devenir. Au cours du cycle saisonnier, la concentration de la CDOM permet de montrer l'importance dominante des apports continentaux par rapport à la production autochtone de matière, même lors du développement d'efflorescences phytoplanctoniques et de montrer l'importance relative de l'exportation vis à vis des consommations par le compartiment bactérien

40th CIESM Congress: The largest Forum on Mediterranean and Black Sea Research, 28 October - 1 November 2013, Marseille, France.-- 1 page, Genetic studies of octocoral populations in the Mediterranean Sea have revealed a pattern of strong and short distance genetic structure without apparent deep genetic break. In order to better understand such structuring we provide here an analysis of connectivity in the North-Western Mediterranean for two species: the red coral Corallium rubrum, and the red gorgonian Paramuricea clavata. We compare the results obtained by different methods aimed at estimating recent or long term components of gene flow. The results are discussed in the light of the biological characteristics of these species, of their evolutionary history and of the potential limits of the methods used

40th CIESM Congress: The largest Forum on Mediterranean and Black Sea Research, 28 October - 1 November 2013, Marseille, France.-- 1 page, 2 figures, In the present work we describe the feeding habits of three coexisting chondrichthyans (Galeus melastomus, Etmopterus spinax and Chimaera monstrosa)in the Gulf of Lyon (North-Western Mediterranean Sea) during the summer 2011 at mean depths of 489 m. To examine their diet and potential interspecific differences, we combined two methodologies: the analysis of stomach content and isotopic mixing models. Our results showed clearly trophic segregation between C. monstrosa and the other two species, revealing the higher trophic position for this species

Here we present an update of the aerial surveys that have been carried out by IFREMER in the western Mediterranean Sea since 2000. This collection of data enables the monitoring of the bluefin juvenile population since the Gulf of Lyon is considered as a nursery for young individuals. The detections of juvenile bluefin tuna are carried out along the same transects between 2000-2003 and then 2009-2011 and are used to calculate a fishery-independent index of bluefin tuna abundance. This index can therefore be included in the stock assessment procedure as an abundance index of juveniles., Nous présentons ici une mise à jour des données de suivis aériens effectués par IFREMER en Méditerranée occidentale depuis 2000. Ces données permettent le suivi de la population de juvéniles de thon rouge car le Golfe du Lion est considéré comme une nourricerie pour ces jeunes individus. Les détections de bancs de thon rouge sont réalisées le long des mêmes transects entre 2000 et 2003 puis de 2009 à 2011 et sont utilisées afin de calculer un indice d'abondance indépendant des données de pêche pour les juvéniles de thon rouge. Cette indice peut ainsi être inclus dans la procédure d'évaluation de stock en tant qu'indice d'abondance des juvéniles., Se presenta una actualización de los datos de prospecciones aéreas efectuadas por IFREMER en el Mediterráneo occidental desde 2000. Estos datos permiten el seguimiento de la población de juveniles de atún rojo ya que el golfo de León es considerado una zona de alimentación para estos ejemplares jóvenes. Las detecciones de los bancos de atún rojo se realizaron a lo largo de los mismos transectos entre 2000 y 2003 y posteriormente de 2009 a 2011 y se utilizan para calcular un índice de abundancia independiente de la pesquería para los juveniles de atún rojo. Este índice puede así incluirse en el procedimiento de evaluación de stock como índice de abundancia de juveniles.