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Registros recuperados: 47
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Abattement de l'azote par le marais côtier de Kervigen et potentiel breton ArchiMer
Piriou, Jean-yves; Coic, Daniel; Merceron, Michel.
The coastal marsh of Kervigen is located near by the bay of Douarnenez and its 22 hectares are almost entirely covered by reeds. An experiment was there carried out to assess the nitrogen flux depletion of a small stream, the Kerharo. That one has a 45 km 2 mostly agricultural drainage basin. Due to its nitrate loadings to the next sandy beach, it feeds a green algae (Ulva) proliferation. In order to control its nitrogen fluxes, the stream was partly diverted through a part of the marsh (9 ha), before it was allowed to go back to the main bed. Thus a collapsible weir was set up during several springs and summers, i.e. the growing period of Ulva. The nitrate stripping off the going through flux is within a 30 to 90 % range,that is important (175 kg N03...
Tipo: Text Palavras-chave: Algae; Nitrogen; Ulva; Nitrate depletion; Costal marsh; Algue; Azote; Ulva; Abattement de nitrate; Marais côtier.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/rapport-64.pdf
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Apports d'origine agricole et qualité des eaux côtières ArchiMer
Merceron, Michel.
This summary and orientation document concerning the impact of agricultural activities on the quality of coastal waters summarises the main pollution, with the exception of organic microcontaminants. The excess of nutritive contributions is considered to be the most significant problem.
Tipo: Text Palavras-chave: Discharges; Salubrity; Eutrophication; Water quality; Débits; Salubrité; Eutrophisation; Qualité d'eau.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/1989/rapport-2652.pdf
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Aquaculture marine et littorale ArchiMer
Sauriau, Pierre-guy; Merceron, Michel; Goulletquer, Philippe.
Marine fish farming is fairly recent in France and it is still in the process of being developed. On the Atlantic and Channel coasts, it deals mainly with Atlantic salmon (Salma salar), fario trout (Salmonella faria) with l,400 t in 1991, and turbot (Scophthalmus maximus) with 600 t. In Gravelmes a bass (Dicentrarchus labrax) and bream (Sparus auratus) farm (1,000 t) uses water which is heated (Mediterranean production for these two species is around 2,000 t). Although these figures are low compared to French shellfish farming (200,000 t) and foreign fish farms (150,000 t in Norway, for example), they are growing.
Tipo: Text Palavras-chave: Biocénoses; Conchyliculture; Algoculture; Mesure de Protection; Impact non trophiques; Impact; Aquaculture littorale; Aquaculture marine.
Ano: 1997
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Baie de Vilaine : juillet 1982 mortalité massive de poissons l'analyse des causes et des mécanismes du phénomène, les propositions d'actions ArchiMer
Merceron, Michel.
At the end of July 1982, a massive number of fish and benthic invertebrates died in Vilaine Bay. The mass of fish concerned has been estimated at several tens of tonnes. The analysis of the event's conditions indicates that it was asphyxiation caused by a very pronounced depletion of dissolved oxygen in the bay's bottom waters. The appearance of toxic phytoplankton in the years that followed (Dinophysis) is aseparate topic of research by IFREMER. The most likely mechanism of that anoxia is a succession of events: (1) a first flood of Vilaine River inducing a vertical stratification of waters in Vilaine Bay, (2) an intense and superficial bloom of marine phytoplankton, (3) a stormy weather breaking up the stratification and mixing superficial...
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Ano: 1989 URL: http://archimer.ifremer.fr/doc/1989/publication-2833.pdf
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Biomasses d'ulves et flux de nutriments en baie de Douarnenez ArchiMer
Merceron, Michel; Coic, Daniel; Talec, Pascal.
In spring and summer time, green tides outbreaks yearly occur on sandy beaches of the central and southern parts of the bay of Douarnenez. During four years the nitrate loadings of incoming streams were measured during the growth season of the green algae. Every summer the stock of stranded algae as well as those in the very shallow water were quantified. Three streams from the eight investigated provide the most important part of nitrogen loadings. These ones tend to diminish in the course of spring and summer. They are very different from year to year. The observed biomass of algae is also very different according to years (from 120 to 3 400 t), and even from day to day according to the wind direction. However, the southern part of the bay is more...
Tipo: Text Palavras-chave: Brittany Bay of Douarnenez Eutrophication Nitrate Ulva Green tide Bretagne Baie de Douarnenez; Eutrophisation Nitrate Ulve Marée verte.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/rapport-63.pdf
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Complement méthodologique à l'étude d'impact du Légué (Saint Brieuc) ArchiMer
Merceron, Michel.
The project to enlarge the port of Le Légué at St-Brieuc required conducting an environmental impact study. This took place in 1980 and 1981 (Merceron et al). In view of the project's importance and the almost complete absence of baseline ecological studies of this area, it has been necessary to proceed with a rather extensive investigation. In this way, the field studies focused on the following aspects: hydrobiology, benthos, contaminants in the water, the sediment and living matter, Yffiniac marsh, flat fish nurseries. Overall, the impact of the Le Légué port enlargement on the marine environment of the bottom of St-Brieuc's bay seemed to be relatively minor. However a qualification was made concerning the modes of discharge of the planned basin's...
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Ano: 1983 URL: http://archimer.ifremer.fr/doc/1983/rapport-2842.pdf
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Contribution à l'étude d'impact pour l'extension du port de OUISTREHAM ArchiMer
Merceron, Michel.
De l'agglomération de CAEN à la mer, le canal double le cours de l'Orne sur une distance d'environ 14 km. Au port de OUISTREHAM le canal cominunique avec la mer par deux écluses, et en aval des écluses se trouve la confluence avec l'orne, Jusqu'au niveau des basses mers, le chenal est commun et il est encadré par deux enrochements d'axe N.S. sur une distance de 2 Km (cf. carte n°1). Les débits de l'Orne seraient respectivement de 2 m3/s en étiage, d'environ 21 m3/s en débit moyen et de 70 m3/s en crue. Ce fleuve alimente la sédimentation en matières fines qui se produit à la fois dans le chenal commun a l'aval, et dans l'avant-port soit entre le point de confluence et les écluses. La présente étude (carte n°2) porte sur : - la zone de sédimentation...
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Ano: 1980 URL: http://archimer.ifremer.fr/doc/00106/21684/19263.pdf
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Courantométrie du site d'élevage de salmonides en grande rade de Cherbourg ArchiMer
Merceron, Michel; Gaffet, Jean-dominique.
Current recordings were performed near the middle of the great breakwater of Cherbourg ("Grande Digue", inner side) during two months of the 1993 summer. The data show that, in this site, the currents drive mostly westwards. They are driving eastwards only during the first half of flood. In the tidal cycle, there is only one current slack, at law tide. The most important velocities are observed during the high tides : 0.5 to 0.6 m.s-1• The fish net pens, which are located there, tend to speed up the undemeath currents and, thus, contribute to scatter the farm effluents. The temperature and salinity records are also displayed. _
Tipo: Text Palavras-chave: Courant; Cage; Élevage; Poisson; Cherbourg; Current; Net pen; Farm; Fish; Cherbourg.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00082/19330/16924.pdf
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Des poissons médusés ArchiMer
Merceron, Michel; Le Fevre-lehoerff, Geneviève; Bizouarn, Yvon; Kempf, Marc.
After the efflorescence of toxic phytoplankton that affected them in the month of September 94 (see our March 95 issue), the Camaret salmonid farms were confronted with a proliferation of stinging jellyfish at the end of the month of November (photo 1). In January 95, it is in Douarnenez Bay that trout are affected by the same phenomenon...
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Ano: 1995 URL: http://archimer.ifremer.fr/doc/1995/publication-2832.pdf
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Etude de la matière organique et demande en oxygène des sédiments en baie de vilaine ArchiMer
Merceron, Michel.
After the fish mortality through an anoxia, which occured during the summer of 1982 in the bay of Vilaine, the oxygen consumption of the sediment was investigated during spring and summer. It was found moderately important, submitted to limited evolutions along time and on different zones. A significant correlation with the organic carbon content of sediment could not be established. The oxygen consumption of the bottom waters was approached. In the bay of Vilaine as a whole, it was found more important than the sediment consumption. It could vary in a wide range, till leading to pronounced hypoxias, especially during phytoplankton. (Not controlled OCR)
Tipo: Text Palavras-chave: Organic matter; Water oxygen consumption; Sediment oxygen consumption; Anoxia; Dissolved oxygen; Coastal waters; Matière organique; Respiration de la phase liquide; Respiration du sédiment; Anoxie; Oxygène dissous; Eaux côtières.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/1986/rapport-2666.pdf
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Extension du port du Legue (St Brieuc) étude d'impact sur l'environnement marin ArchiMer
Merceron, Michel; Manaud, Francois; Guillaud, Jean-francois; Monbet, Yves.
The commercial port of the city of St-Brieuc currently has a limited capacity. It is only accessible for low-tonnage ships, and for this reason, cargo is not allowed, which is a contributing factor to its current traffic being limited to 450,000 tonnes per year. A significant silting-up of the port is diminishing even more its potential for accepting ships. Its future seems, therefore, threatened. Several studies conducted by the Côtes-du-Nord Chamber of Commerce and Industry have concluded that it is necessary to develop a port with greater capacity, which would stimulate the regional economy. Cargo traffic would then reach 1 million tonnes per year, and St-Brieuc would be accessible to heavier-tonnage coasters and would then follow the current growth of...
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Ano: 1981 URL: http://archimer.ifremer.fr/doc/1981/rapport-2835.pdf
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Gestion écologique de l'étang du fret (Finistère) ArchiMer
Merceron, Michel.
The Frêt Pond at Crozon (Finistère) occupies the southwest part of Frêt's cove in Brest's harbour (fig. 1). This 18-hectare pond was isolated from the harbour by the natural accumulation of a mound of pebbles, which was reinforced by rocks so that it could support the D 155 road. At the free end of this mound, a tide mill had been built in the past, and it is through its release channel that water exchanges currently take place between the Frêt pond and Brest's harbour. The pond's catchment area occupies a surface area of 2.70 km2, of which 1.8 km2 are being farmed and 0.5 are forest area (fig. 1). The average flow over the year is estimated at 58 l/s based on a specific flow of 21.4 l/s/km2. It is therefore about 1.8 million cubic metres of fresh water...
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Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/rapport-2649.pdf
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Impact de la pisciculture marine intensive sur l'environnement : (2) l'environnement d'un site d'élevage de salmonidés en cages flottantes, Camaret année 1994 ArchiMer
Kempf, Marc; Jacq, E; Le Guellec, C; Merceron, Michel; Monfort, Patrick; Nezan, Elisabeth; Ryckaert, Mireille.
This document presents a year-long (1994) environmental study conducted on a site of intensive farming of salmonids (mainly fario trout) in Camaret Bay. A set of parameters were considered for the body of water and the sea bed (flow patterns, hydrology, sedimentology, biology, chemistry) and complemented by video observations. The study concluded that there was a measurable effect from the farm in its current configuration, but that the impact was of a very limited intensity and scope that did not affect the environment in a substantial way. It is recommended that production growth be accompanied by a minimum amount of environmental assessment.
Tipo: Text Palavras-chave: Bretagne; Truite fario; Salmonidés; Environnement; Pisciculture marine.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/1995/rapport-2834.pdf
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Impact de la pisciculture marine intensive sur l'environnement. Revue bibliographique ArchiMer
Videau, Christiane; Merceron, Michel.
A review of the publications concerning the impact of the intensive marine fish farming to the environment was performed. The existing literature is mostly devoted to the salmonids farmed in Scandinavia and Scotland. The results of this review are only partly relevant to the French environment which needs more specific studies. A more extensive abstract is displayed farther on. (not controlled OCR)
Tipo: Text Palavras-chave: Environnement côtier; Impact; Salmonidés; Pisciculture intensive; Coastal environment; Impact; Salmonids; Intensive fish farming.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/rapport-2656.pdf
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Impact de la salmoniculture marine sur l'environnement en rade de Cherbourg (1993-1995) 1. Eau et Pélagos ArchiMer
Merceron, Michel; Bentley, Daniel; Le Grand, Jacqueline; Lamort-datin, Laure; Kempf, Marc.
The environmental impact of a brown trout farm located in the Grande Rade de Cherbourg (Normandy) is reported. During observations the fish stock evolved within the range of 140 to 350 metric tons. Farm influence was researched on water column through hydrochemistry, phytoplankton, faecal bacteria and, on bottom, through grain size, organic matter, metals, macrobenthos. This report only deals with water column. Except ammonia, no hydrological parameter seems to be affected, even near to the net pens. Phytoplankton and coliform bacteria were not altered. An extra concentration of ammonia was detected at some tens meters from the raft, with favourable conditions. But generally it was impossible to observe it unless close to the farming structure, downward...
Tipo: Text Palavras-chave: Channel; Current; Faecal bacteria; Phytoplankton; Hydrology; Impact; Salmonid; Fish farm; Manche; Courant; Bactéries fécales; Phytoplancton; Hydrologie; Impact; Salmonidé; Aquaculture.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/1997/rapport-3342.pdf
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Impact de la salmoniculture marine sur l'environnement en rade de Cherbourg (1993-1995) 2. étude biosédimentaire ArchiMer
Kempf, Marc; Cadour, Gwenael; Jeanneret, Hélène; Mear, Yan; Miramand, Pierre; Merceron, Michel.
This document is a result of an environmental impact study carried out between 1993 and 1995 on the site of a marine trout culture located in the Harbour of Cherbourg, France. It deals with the solid waste of the farm and concems deposition rate, sediment analysis and chemistry (fine fraction < 63 ~m, organic matter, carbon, nitrogen, copper and zinc), bottom living organisms and underwater video monitoring. The impact observed is very moderate and localised. This is mainly due to the strong d)'TIamics and flushing rate of the site. A seperate volume of the same study deals with dissolved waste and concems the water mass (volume 1 : water and pelagos). (Not controlled OCR)
Tipo: Text Palavras-chave: Rade de Cherbourg; Étude biosédimentaire; Impact; Salmoniculture marine; France; Cherbourg; Benthos; Sediment; Environmental impact; Trout; Marine fish farming.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/1997/rapport-3349.pdf
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Impact du barrage d'Arzal sur la qualité des eaux de l'estuaire et de la baie de la Vilaine ArchiMer
Merceron, Michel.
The Arzal dam upon the Vilaine estuary provokes an aggravation of a recurrent summer hypoxia of the bottom waters in the bay of Vilaine.
Tipo: Text Palavras-chave: Suspended sediments; Salinity; Coastal zone; Dam estuary; Oxygen depletion; Matières en suspension; Salinité; Zone côtière; Estuaire; Barrage; Anoxie.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/1989/rapport-2658.pdf
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Impact du régime du barrage d'Arzal sur la stratification a l'embouchure de la Vilaine : étude par modélisation numérique ArchiMer
Le Hir, Pierre; Duchene, C.; Merel, A; De Nadaillac, G.; Merceron, Michel; Breton, Marguerite.
The rate of flow of the fresh water releases at the Arzal Dam into the Vilaine is likely to influence the haline structure of Vilaine Bay. In order to determine the rate of flow that causes a minimum downstream stratification, a vertical two-dimensional mathematical modelling of the Vilaine's estuary was undertaken. We obtain very similar stratification flows for different fresh water release scenarios, in spite of the rather different desalinisations and currents.
Tipo: Text Palavras-chave: Water release; Stratification; Estuary; Numerical model; Vilaine; Rejet de barrage; Stratification; Estuaire; Modèle numérique; Vilaine.
Ano: 1986 URL: https://archimer.ifremer.fr/doc/1986/rapport-2654.pdf
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In situ growth potential of the subtidal part of green tide forming Ulva spp. stocks ArchiMer
Merceron, Michel; Antoine, Virginie; Auby, Isabelle; Morand, P.
Ulva spp., the algae most responsible for green tides in Brittany (France), are found on the foreshore and in the most beachward wave area (MBWA) of many bays during green tide phenomena. These algae have recently been seen drifting at greater depths (reaching -20 m). In view of the significant quantities of algae found at these depths, and the less favorable conditions for algal growth than in the intertidal zone, we attempted to determine if they could grow there. For that, during their maximum growth period (from May to July), algae were picked up at three stations located on the foreshore, in the MBWA and in the subtidal (deep) zones of the Bay of Douarnenez, and their nitrogen, carbon and chlorophyll a+b contents were determined, and their...
Tipo: Text Palavras-chave: Nutrients; Irradiance; Photosynthesis; Ulva sp.; Algal blooms; Eutrophication.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3527.pdf
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Inventaire des sites possibles pour l'aquaculture sur le littoral du Morbihan - Tome 1 ArchiMer
Fleury, Pierre-gildas; Merceron, Michel.
Volume I – Coastal Environment and Aquafarming Volume II – Aquafarming Potential Volume III – File of Selected Sites
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Ano: 1980 URL: http://archimer.ifremer.fr/doc/1980/rapport-2839.pdf
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