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| Registros recuperados: 24 | |
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| Kerambrun, Elodie. |
| La biodéposition liée à l'exploitation des filières de moules est responsable de l' accumulation de particules fines dans l'environnement marin. Cette biodéposition consiste, à travers la formation de feces et de pseudo feces, en un transfert de particules sestoniques, de la tranche d'eau vers le sédiment. Au cours de ce travail nous avons étudié l'influence des cycles de marée et de l'intensité de celle-ci sur la biodéposition, à travers la mesure de flux verticaux de particules. De même, l'impact de cette biodéposition (aspects qualitatifs et quantitatifs) sur le seston a été abordé. Notre étude montre une variation de l'intensité des flux liée au cycle de marée. Les flux les plus importants sont mesurés lorsque les courants sont les plus intenses,... |
| Tipo: Text |
Palavras-chave: Mollusques; Feces; Pseudofeces; Matière organique; Seston; Biodéposition. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/00446/55740/57392.pdf |
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| Mazzella, Audrey. |
| This work is part of a general study aiming at the modelling growth and dispersion of the larvae of Pinctada margaritifera in the lagoon of Ahe atoll (Tuamotu, French Polynesia). The general objective of this study is to set up a model coupling the growth and the dispersal of chlorophyll and particulate matter according to different spatial and temporal scales. Totally 1111 samples were taken in 12 stations from April 21st to May 28th, 2007. The speed and the direction of the wind bad a significant effect on the different parameters. The depth has not influence on the variations of the chlorophyll and the particulate matter that of their quality descriptors (proportion of cells lower than 2 µm, that of the phaeopigments and the organic matter). A... |
| Tipo: Text |
Palavras-chave: Ahe; Collectage; Temporel; Spatial; Chlorophylle; Phéopigments; Matières en suspension; Matière minérale; Matière organique. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/00426/53794/54709.pdf |
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| Lemonnier, Hugues. |
| En 1996, le vieillissement des fonds de bassins aquacoles de crevettes était présenté comme hypothèse explicative de la dégradation des rendements de production sur certains sites d’élevage. Un travail conséquent avait été réalisé à l’époque dont l'objectif était, à partir d'un inventaire des différents sédiments des fermes aquacoles du Territoire, de mettre en évidence une éventuelle évolution de ce sédiment au fil des cycles d'élevage et son influence sur la productivité. L’objet de ce document est de numériser et de compiler les différentes fiches techniques diffusées à l’époque sous forme papier aux aquaculteurs de la filière crevette de Nouvelle-Calédonie. |
| Tipo: Text |
Palavras-chave: Aquaculture; Litopenaeus stylirostris; Durabilité; Sédiment; Envasement; Matière organique; PH; Déchets. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00656/76762/77918.pdf |
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| Chamroux, S.; Boucher, G.. |
| Chemical and Biological evolution of sediments in closed circuit : I. Nitrogen and bacteria. A series of well controlled sea water closed circuit sand filters allowed the study of chemical and biological regulation processes in the sediment. Bacteria, Nitrogen chemistry and meiofauna were mainly investigated. The evolution of the different forms of nitrogen is rather similar, whatever the organic matter flow in the sediment. As long as the amount of organic input works as limiting factor, bacteria densities are proportional to its flow. No correlation was found between bacteria and chemical parameters in the sand or in the water. The temperature does not seem to play a determinant part neither in the evolution of bacteria nor in the mineralization of... |
| Tipo: Text |
Palavras-chave: Circuit clos; Sédiment; Bactéries; Matière organique; Azote; Closed circuit; Sediment; Bacteria; Organic matter; Nitrogen. |
| Ano: 1979 |
URL: http://archimer.ifremer.fr/doc/00305/41652/40861.pdf |
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| Heral, Maurice; Razet, Daniel; Maestrini, Serge; Garnier, Jacqueline. |
| A twice monthly study shows that the major amount of organic material is from detrtic origin, and is brought in winter, when valeus of mineral seston are very high. In the sping time, phytoplancton blooms, do not make up for lack of detritic material where as in the summer, oceanic phytoplancton is composed of important amounts of carbohydrates. Available food is defined as sum of protids, lipids and carbohydrates and mesured in energetic therms. This allows to foretell the amount of food that molluscs ar likely to assimilate. |
| Tipo: Text |
Palavras-chave: Marennes Oléron; Nutrition; Matière organique; Crassostrea gigas; Huîtres. |
| Ano: 1980 |
URL: http://archimer.ifremer.fr/doc/1980/acte-3003.pdf |
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| Thouvenin, Benedicte; Romana, Louis-alexandre. |
| Depuis plusieurs années, on observe en période post-estivale un très important déficit en oxygène dissous dans l'estuaire de la Loire, accompagné par une mortalité élevée de certaines espèces halieutiques migratrices. L'origine de cette anoxie est imputée au stock de matière organique particulaire biodégradable qui est piégée dans la zone de turbidité maximale. A la demande de l'Association pour la Protection de l'Environnement de l'Estuaire de la Loire, un modèle mathématique a été mis en place pour décrire les mécanismes hydrodynamiques et hydrosédimenraires dans l'estuaire, ainsi que l'évolution de l'oxygène dissous et la dégradation de la matière organique. Dans une première phase, ce modèle reproduit l'évolution longitudinale et temporelle de... |
| Tipo: Text |
Palavras-chave: Modèle mathématique; Estuaire; Loire; Oxygène dissous; Matière organique. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/00439/55039/56471.pdf |
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| Boucher, G.. |
| Chemical and Biological evolution of sediments in closed circuit : II. Effect of soluble organic matter input on meiofauna in polytrophic systems. The effect on meiofauna of the input of soluble organic matter in closed circuit sand filters was followed during two years for an oligotrophic, a mesotrophic and an eutrophic tank, and during one year for an atrophic tank. In the case of no input, the density, biomass and species richness of nematodes decreases even if equitability remains constant. Oligotrophy maintains the stability and diversity. Mesotrophy changes the community composition by species succession. Eutrophy allows biomass increase, due to one dominant species. |
| Tipo: Text |
Palavras-chave: Circuit clos; Matière organique; Meiofaune; Closed circuit; Organic matter; Meiofauna. |
| Ano: 1979 |
URL: http://archimer.ifremer.fr/doc/00305/41653/40862.pdf |
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| Arzul, Genevieve; Youenou, A.; Derrien, Annick; Gentien, Patrick; Crassous, M.p.; Lunven, M.. |
| The study of different chemical parameters characterizing the coastal sediment, showed a possible relation between, respectively, high levels in organic matter and total copper, and the "red tide" phenomenon. |
| Tipo: Text |
Palavras-chave: Sédiment côtier; Eaux colorées; Matière organique; Cuivre; Coastal sediment; Red time; Organic matter; Copper. |
| Ano: 1988 |
URL: http://archimer.ifremer.fr/doc/00425/53708/54565.pdf |
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| Neira, C; Sellanes, J; Soto, A; Gutierrez, D; Gallardo, Va. |
| Quantitative surveys of metazoan meiofauna were carried out in an upwelling region off Central Chile (36 degreesS). During May 1997 and May 1998, coinciding with the onset and end of Fl Nino, five benthic stations (respectively 27, 34, 64, 88, and 120 m depth), from the middle of Concepcion Bay to the edge of the adjacent continental shelf, were sampled. The sedimentary organic matter biopolymeric fraction (proteins, carbohydrates and lipids) and chloroplastic pigments were also assessed. Total meiofauna abundance and biomass increased significantly between sampling dates at the mid-bay and inner shelf sites, from 1474 +/- 354 to 5035 +/- 291 individuals 10 cm(-2) and from 2618 +/- 332 to 5241 +/- 903 individuals 10 cm(-2), respectively. The relative... |
| Tipo: Text |
Palavras-chave: Chili central; El Niño; Méiofaune; Matière organique; Thioploca; Central Chile; El Nino; Meiofauna; Organic matter; Thioploca. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/00322/43358/42857.pdf |
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| Heral, Maurice; Zanette, Yvan; Deslous-paoli, Jean-marc; Robert, Jean-michel; Razet, Daniel. |
| In 1979 and 1980, the characteristics of the particulate organic matter are defined fortnightly through seston analyses. It is very high in the basin and very low in the finishing ponds. The phytoplanktonic biomasses are maximal in May in the estuary, and in June-July in the finishing ponds, with chlorophyll contents 10 times higher than those monitored in the basin. Proteins are generally the main biochemical components found in both environments, with glucids accounting for 20 % and lipids for only 10 % of the biochemical components on average. The C/N ratios are almost constant in the finishing ponds with values around 5, typical of phytoplankton, whereas they are very high in the basin except in spring. In the same way, the protid/chlorophyll and the... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Huîtres; Mollusques; Qualité eau; Seston; Matière organique; Claires ostréicoles; Bassin Marennes Oléron. |
| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/1981/acte-6213.PDF |
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| Maurice, Laurence. |
| The main problem of the Girond estuary is a pollution by the cadmium. During this last ten years, the good quality of the water is proved by the analysis of the main physico - chemical and biochemical parameters and bacteria. But since 1989, straight to the Blayais power station, the BOD5 varied between 2 and 3,5 mg.l-1 and a diminution of the dissolved oxygen has been observed; it's probably caused by the accumulation of biodegradable organic matter in the maximum turbidity zone during years characterized by low river flows. For average river flow, urban discharges takes part for 20 % in total fluxes of BD05; in 1991, this part attempts 35 %. During the last 7 years, the pluriannual evolution of the nitrate concentrations measured in the Garonne river... |
| Tipo: Text |
Palavras-chave: Oxygène; Sels nutritifs; Matière organique; Bactéries; Apports; Estuaire Gironde; Oxygen; Nutrients; Organic matter; Bacteria; Fluxes; Gironde estuary. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00037/14855/12178.pdf |
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| Delmas, Daniel. |
| The étang de Berre, near Marseilles (France), is an inland brackish basin with a high primary rate of production. In 1966, the diversion of the Durance River introduced important hydrological changes. A study of organic matter mineralization and ionie exchanges at the water-sediment interface has made it possible to distinguish two areas, according to the composition of organic matter, mineralization mechanism and ionie transfers. In the North, the high rate of mineral sedimentation leads to a low content of organic matter in the sediment. This organic matter of detrital origin is little affected by mineralization; there is, however, high production of ammonium nitrogen, which is released to overlying waters. Nitrates and nitrites undergo denitrification... |
| Tipo: Text |
Palavras-chave: Interface eau-sédiment; Matière organique; Eau interstitielle; Minèralisation; Milieu saumâtre; Water-sediment interface; Organic matter; Lnterstitial water; Mineralization; Brackish basin. |
| Ano: 1980 |
URL: http://archimer.ifremer.fr/doc/00122/23317/21142.pdf |
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| Registros recuperados: 24 | |
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