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Devenir des bactéries dans les réseaux trophiques des vasières intertidales : le cas de brouage (Baie de Marennes-Oléron) ArchiMer
Pascal, Pierre-yves.
Bacteria are highly abundant and productive in intertidal mudflat sediments. By analogy with pelagic system, it has been suggested that bacteria play an important role in benthic food web. Due to technical difficulties, numbers of studies dealing with benthic bacterivory are not numerous and give conflicting results. A method using community of 15N enriched bacteria as tracer was developed in order to measure grazing of meiofauna and macrofauna. Since enriched bacteria present characteristics of size, activity and diversity close to natural ones, bias due to selective bacterial ingestion by grazers are limited. Due to tidal cycles, intertidal mudflat constitutes highly variable environment at short time scale. Since those variations may influence...
Tipo: Text Palavras-chave: Stable isotope; Hydrobia ulvae; Foraminifera; Copepod; Nematode; Bacteria; Mudflat; Trophic foodweb; Isotope stable; Hydrobia ulvae; Foraminifère; Copépode; Nématode; Bactérie; Vasière; Réseau trophique.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/these-4778.pdf
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Dynamique des sédiments fins et mixtes des zones intertidales de la baie de Marennes-Oléron ArchiMer
Kervella, Stephane.
This thesis aims at increasing the general knowledge on sediment dynamics of intertidal flats in the Marennes-Oléron Bay, according to physical, biological and anthropogenic factors. The conducted research is compound of three complementary studies: (1) a study of sediment behaviour through applied rheophysics on intertidal superficial sediments; (2) a hydro-sedimentary study based on identification of the forcing action (physical, biological or anthropogenic) on the intertidal flat stability over several time scales (from the event to several months); (3) a specific application of the model SiAM-2DH to the Marennes-Oléron Bay. The surface sediments shows a mechanical behaviour that mainly depends on the fine fraction for a composition that contains up...
Tipo: Text Palavras-chave: Rhéophysique; Seuil d’écoulement; Sédiments cohésifs et mixtes; Sédimentation; Érosion; Hydrodynamique; Vasière; Zone intertidale; Conchyliculture; ALTUS; SiAM-2DH; Baie de Marennes-Oléron; Rhéophysics; Shear strenght; Cohesive and mixed sediment; Sédimentation; Erosion; Hydrodynamics; Mudflat; Intertidal area; Oyster; ALTUS; SiAM-2DH; Marennes-Oléron Bay..
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00004/11534/8117.pdf
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