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| Registros recuperados: 18 | |
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| Dorel, Didier; Desaunay, Yves. |
| The abundance of sole juveniles was estimated in October 1986 and 1987 for three nursery grounds which contribute to the stock of the Bay of Biscay (Bay of Vilaine : 332 km2, Pertuis Breton : 264 km2, Pertuis d'Antioche : 276 km2). Topography and sediments induce differences in sole distribution. The densities of juveniles are highest in both Pertuis, by x 6 to x 20 compared to the Vilaine. The interannual variation of the mean densities is opposite in the northern zone (x 0,66) and in both southern zone (x 2,13). The mean lengths of 0-group are different between the three sites ans between years. The contribution of a given nursery ground to the stock is not merely proportional to its surface and each of the nurseries may have its own dynamics. The final... |
| Tipo: Text |
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| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00394/50570/51261.pdf |
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| Desaunay, Yves; Dorel, Didier; Durand, Jocelyn; Beillois, Pierre. |
| Les granulats marins, siliceux ou calcaires, sont appelés à prendre le relai des ressources minèrales terrestres recherchées pour la construction, la confection des routes, l'utilisation comme ballast, remblai, amendement des sols ... Selon les secteurs, les besoins sont plus ou moins pressants, en fonction de la ressource terrestre (ou fluviale) et des contraintes économiques ou "environnementales". |
| Tipo: Text |
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| Ano: 1980 |
URL: http://archimer.ifremer.fr/doc/00046/15729/13131.pdf |
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| Longere, Paul; Dorel, Didier. |
| Only fifteen or so years ago, the geology and sedimentology of the Gulf of Gascony was not at all well known. Dredging was rare and the only systematic readings of the nature of the sea beds were given by the Hydrographic Service's probes. It is based on this information that DELESSE (1872) made the lithologic map of the French seas, revised and supplemented by THOULET in 1904. In 1955, BERTHOIS published the first summary research. He used dredgings from various campaigns, Pourquoi-Pas?, Quentin-Roosevelt, President Theodore Tissier, and resumed the previous research work of DANGEARD (1928), FURNESTIN (1937) and BERTHOIS (1946). He classified the collected sediments according to the shape of their cumulative curve, their average diameter and created a... |
| Tipo: Text |
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| Ano: 1970 |
URL: http://archimer.ifremer.fr/doc/1970/publication-3142.pdf |
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| Guerault, Daniel; Beillois, Pierre; Desaunay, Yves; Dorel, Didier. |
| L'exploitation de la civelle d'anguille est d'une importancé primordiale pour un grand nombre de pêcheurs de la façade atlantique, mais les chiffres officiels de production font état d'une baisse importante de 1976 à 1984. L'étude des données commerciales enregistrées pendant cet te période fournit une série dt indices sur les variations récentes des captures, de l'effort de pêche et de la prise par unité d'effort dans l'estuaire de la Loire et de la Vilaine. L' évolution des prises par unité d'effort,' interprétées comme des indices d'abondance est la même dans les deux secteurs'. Elle permet de conclure à une très nette diminution de la ressource. |
| Tipo: Text |
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| Ano: 1985 |
URL: http://archimer.ifremer.fr/doc/00135/24576/22606.pdf |
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| Koutsikopoulos, Constantin; Karakiri, M; Desaunay, Yves; Dorel, Didier. |
| Otolith microstructure analysis of sole juveniles, Solea solea (0-2 groups) sampled in the Bay of Vilaine, Bay of Biscay, was carried out using scanning electron microscopy. Daily increment analysis showed two cases growth retardation, recorded as narrow increment deposition during the first weeks after transition to the bottom-dwelling mode of life. It is assumed that the observed growth retardation of 0-group sole in the summer of 1982 might have been caused by the oxygen deficiency recorded in the Bay of Vilaine at that time. The same observation in otolith microstructure during late spring 1986 might be associated with a strong cold freshwater discharge recorded in the sampling area that affected both water salinity and temperature. |
| Tipo: Text |
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| Ano: 1989 |
URL: https://archimer.ifremer.fr/doc/00482/59341/62140.pdf |
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| Beillois, Pierre; Desaunay, Yves; Dorel, Didier; Lemoine, M.. |
| L'étude des ressources benthiques du secteur côtier, et particulièrement des ressources accessibles au chalutage de fond représente l'essentiel des travaux entrepris depuis 1976 par le laboratoire "Ressources halieutiques littorale" de l'ISTPM. Les premières prospections dans le secteur nord-Bretagne avaient été programmées pour mai 1978. En raison de la catastrophe de l'AMOCO-CADIZ, les premières observations ont débuté en avril. La présente étude décrit l'état des ressources exploitables et potentielles (juvéniles) au printemps, un mois après l'échouage de l'AMOCOCADIZ et à l'automne 78. Les prospections sont limitées à deux secteurs restreints, en raison de l'étroitesse des fonds chalutables de la zone côtière s'étendant des Abers aux Héaux de Bréhat.... |
| Tipo: Text |
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| Ano: 1979 |
URL: http://archimer.ifremer.fr/doc/00046/15755/13157.pdf |
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| Beillois, Pierre; Desaunay, Yves; Dorel, Didier; Lemoine, M.. |
| Les travaux décrits par la présente étude s'inscrivent dans un programme général de l'ISTPM (laboratoire "Ressources halieutiques littorales") visant à obtenir la connaissance globale des ressources chalutables du littoral français. Entreprises sur les côtes atlantiques depuis novembre 1976, les prospections ont débuté en Manche occidentale au printemps 1978. Elles ont été orièntées par priorité vers les secteurs susceptibles de constituer des nurseries d'espèces commerciales. |
| Tipo: Text |
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| Ano: 1979 |
URL: http://archimer.ifremer.fr/doc/00046/15768/13170.pdf |
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| Desaunay, Yves; Dorel, Didier; Lem0ine, M.; Beillois, Pierre. |
| Ces connaissances sur le milieu et les activités maritimes côtières sont, en général, récentes. Elles sont satisfaisantes en ce qui concerne la géomorphologie, la répartition des dépôts meubles, les peuplements, la ressource en granulats, mais demeurent imprécises dans le domaine des pêches. Un complément était nécessaire pour évaluer les effets possibles d'extractions de sédiments. |
| Tipo: Text |
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| Ano: 1977 |
URL: http://archimer.ifremer.fr/doc/00046/15763/13165.pdf |
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| Guerault, Daniel; Dorel, Didier; Desaunay, Yves. |
| Expeditions undertaken using a standardised protocol between 1981 and 1996 took a census of species of commercial interest that depend on certain coastal ecosystems for at least the beginning of their life cycle. Of the 55 species censused, we identified 39 fish species, 6 crustacean species and 10 mollusc species (3 cephalopods, 5 bivalves and 2 gastropods). Some of these species are restricted to coastal systems (14 native species: 6 crustaceans and 8 molluscs) and some species whose adults are fished off the coast (41 non indigenous species: all 39 fishes and 2 cephalopods, cuttlefish and squid).The coast functions as a nursery in two ways. First, it constitutes a favourable biotope for the whole life cycle of native species. Second, for non indigenous... |
| Tipo: Text |
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| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/1996/rapport-4228.pdf |
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| Lacroix, Nicole; Rouxel, Catherine; Dorel, Didier. |
| Surveys for larval stages of Dover sole (Solea solea) and Thickback sole (Microchirus variegatus) were carried out in the northern part of the bay of Biscay between 1985 and 1989. The spawning periods of these species overlap but the spawning areas are different since young larvae of M. variegatus are recorded more offshore than those of S. solea. In addition, in spite of a similar behaviour the first species undergo smaller vertical migrations than the second and never reach surface layers. These two observations suggest why Thickhack sole larvae on the contrary of Dover sole larvae never reach coastal areas and achieve whole development in water deeper than 40 m. The life cycle of this species developing thus entirely offshore. |
| Tipo: Text |
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| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00394/50571/51262.pdf |
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| Burgeot, Thierry; Bocquene, Gilles; Truquet, Philippe; Le Dean, Loic; Poulard, Jean-charles; Dorel, Didier; Souplet, Arnauld; Galgani, Francois. |
| An oceanographic cruise in 1991 along the English Channel and Atlantic coasts of France indicated the value of dragonet Callionymus lyra Linnaeus, 1758 as a target species for monitoring biological effects. Ethoxyresorufin-O-deethylase measurements in this species provided a first assessment of the effects of hydrocarbons (PCB, PAH, dioxins) on the marine environment. The specific behavior of dragonet was defined by biochemical characterization. Biological data were obtained during 3 additional oceanographic cruises to study changes in the abundance and distribution of the species in the English Channel and the Bay of Biscay. This first assessment, carried out in the context of the National Observation Network, indicated that pollutants do not have... |
| Tipo: Text |
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| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00091/20243/17895.pdf |
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| Desaunay, Yves; Dorel, Didier; Durand, Jocelyn; Beillois, Pierre. |
| Les granulats marins, siliceux ou calcaires, sont appelés à prendre le relai des ressources minèrales terrestres recherchées pour la construction, la confection des routes, l'utilisation comme ballast, remblai, amendement des sols... Selon les secteurs, les besoins sont plus ou moins pressants, en fonction de la ressource terrestre (ou fluviale) et des contraintes économiques ou "environnementales". Ainsi, la région parisienne est nettement déficitaire, sa consommation de granulats en 1975 étant évaluée à 43,5 millions de tonnes alors que la production en Ile de France n'est que de 24 Mt. Le département côtier de la Charente Maritime a consommé à la même époque 2,7 Mt, et en a produit seulement 1,5 Mt. L'exploitation des sables de Loire, entre Nantes et... |
| Tipo: Text |
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| Ano: 1980 |
URL: http://archimer.ifremer.fr/doc/00045/15609/13013.pdf |
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| Longere, Paul; Dorel, Didier; Marin, Jean. |
| 2 ponds (or lagoon) were studied in order to establish the economic possibilities of their exploitation for oysters. Bathymetric and sediment maps were produced using methods described. They indicate a morphological similarity between the ponds, with a superficial broken bed and a regular, flat or gently sloping bed beyond 7 m, the general form reflecting the aerial relief of the adjacent `coast'. The deeper regions had mud or clay sediment, while the edges of the ponds were covered with sand. In more detailed studies it was evident that the banks of Diane were more regular and steep than those of Urbino, and that only in the latter was there a good relationship between the depth of water and the carbon/nitrogen ratio. Differences are thought to relate to... |
| Tipo: Text |
Palavras-chave: Corsica; Studies; Exploitation; Oysters; Sedimentologic; Bathymetric. |
| Ano: 1972 |
URL: http://archimer.ifremer.fr/doc/1972/publication-2068.pdf |
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| Dorel, Didier; Desaunay, Yves. |
| A stratified sampling scheme of the Bay of Vilaine (332 km super(2)) provided a ten years index of abundance series for the O-group and the I-group of the Dover sole Solea solea), the plaice Pleuronectes platessa , the dab Limanda limanda and the wedge Sole Dicologoglossa cuneata . Variation of distribution and abundance of these species are compared according to their life-cycles, their biogeographic preferences and their estuarine dependence. |
| Tipo: Text |
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| Ano: 1991 |
URL: https://archimer.ifremer.fr/doc/00482/59352/62136.pdf |
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| Registros recuperados: 18 | |
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