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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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Dynamique et réponse fonctionnelle des foraminifères et de la macrofaune benthiques en zone ostréicole dans les pertuis charentais ArchiMer
Bouchet, Vincent.
In oyster farming areas, organic matter fluxes toward sediment is increased. Pacific oysters (Crassostrea gigas) reject organic-rich faeces and pseudofaeces as a result of filtration process. Organic matter can be consumed by benthic fauna, but in excess it can entails the reduction of benthic faunal species richness, abundance and biomass. Organic matter degradation also induces hypoxic (or anoxic) conditions in the sediment, and production of ammonia and sulfides in toxic concentrations. The main objective of this study is to assess the effects of oyster farming on benthic intertidal ecosystems in the Pertuis Charentais. Benthic macrofauna, living (stained) foraminifera, and physicochemical characteristics of the water column and sediment were used as...
Tipo: Text Palavras-chave: CAT scan; Bioturbation; Macrofauna/foraminifera interaction; Sensible species; Tolerant species; Benthic foraminifera; Benthic macrofauna; Chlorophyl a; Organic matter; Intertidal areas; Pertuis charentais; Oyster farming; CAT scan; Bioturbation; Interaction macrofaune/foraminifères; Espèces sensibles; Espèces tolérantes; Foraminifères benthiques; Macrofaune benthique; Chlorophylle a; Matière organique; Zone intertidale; Pertuis charentais; Ostréiculture.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/these-2582.pdf
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Evolution récente de la végétation intertidale du Delta de l'Eyre ArchiMer
Labourg, Pierre Jean; Soriano-sierra, Eduardo-jean; Auby, Isabelle.
Maritime salt-marshes of the Eyre's delta located in Arcachon Bay (South-West Atlantic coast of France) were studied following to a recent work of Soriano-Sierra (1992). In the se tidal areas salt marshes develop at the top of mud-flats covered by Zostera noltii beds, and in the vicinity of fish ponds who are lagoonal impoundments of the 18th century. Along the Eyre's estuary where salinity is reduced by seepage of fresh water from the land, Spartina maritima and other halophilic plants tend to be replaced by a taU marsh of Phragmites communis, Scirpus maritimus and Juncus gerardii. The number of species or species richness is varying: S = 21 in the area l ("La Boucle") S = 26 ("Malprat") and S = 24 ("Comprian"). Rare species are present like Spartina...
Tipo: Text Palavras-chave: Végétation; Zone intertidale; Delta; Vegetation; Delta; Schorre.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/00152/26284/24367.pdf
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Role of biotic interactions on seasonal migrations of the macrozoobenthos living in the upper tidal-flat of the Mont-Saint-Michel bay, France ArchiMer
Meziane, T; Retiere, C.
On the tidal flat of the western part of the Mont-Saint-Michel bay, the macrozoobenthos of the upper flat is characterised by an assemblage of the Macoma balthica community. The dominant species are M. balthica, Nereis diversicolor and Corophium volutator. A field monitoring during a 1-year period along a four-stations transect perpendicularly to the shore showed that biotic interactions affected the local distributions of these species. This was particularly obvious from late spring to late summer while, because of the density increases, competitions for space and/or resources were induced, which stimulated migrations. Intra-specific competition seemed to induce the migration of the 1-year-old M. balthica. Consequently, the migration of the young bivalves...
Tipo: Text Palavras-chave: Macoma balthica; Nereis diversicolor; Corophium volutator; Migration; Zone intertidale; Macoma balthica; Nereis diversicolor; Corophium volutator; Migration; Intertidal flat.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00322/43333/42894.pdf
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