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| Registros recuperados: 49 | |
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| Alzieu, Claude; De Barjac, Huguette; Maggi, Pierre. |
| Le patrimoine forestier est régulièrement menacé par la prolifération de prédateurs qui, par leur voracité, peuvent dévaster de très importantes surfaces boisées. Parmi ces ravageurs, la chenille processionnaire du pin (Thaumetopoea pityocampa SCHIFF) fait l'objet d'une surveillance particulière des services phytosanitaires chargés de la protection des végétaux. Lorsque les populations de chenilles se développent de façon pléthorique des campagnes de lutte sont entreprises soit avec des moyens mécaniques (destruction des branches supportant les nids), soit par traitements aériens à l'aide d'insecticides. Le D.D.T. a d'abord été utilisé pour le traitement de grandes superficies mais en raison d'inconvénients majeurs tels que : apparition de phénomènes de... |
| Tipo: Text |
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| Ano: 1975 |
URL: http://archimer.ifremer.fr/doc/1975/publication-7114.pdf |
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| Cossa, Daniel; Maggi, Pierre. |
| In this research, biodegradation associated with evaluation of the variations of acute toxicity of 5 anionic detergents towards Anguilla anguilla is described. It appears that the process of anionic detergent biodegradation in sea water is similar to the results obtained by many authors working on fresh water. The experimentation shows 2 different kinds of behavior among the 5 anionic detergents tested: (a) the first category is composed of syndets, without aryl group in their formulation, which are promptly oxidized by bacteria and do not reveal variation of acute toxicity during their biodegradation; (b) the other group includes LAS; those syndets need a quite long bacterial acclimation. On the other hand, their toxicity is reduced whilst they are... |
| Tipo: Text |
Palavras-chave: Anguilla anguilla; Toxicity; Biodegradation; Anionic detergent. |
| Ano: 1973 |
URL: http://archimer.ifremer.fr/doc/1973/publication-2155.pdf |
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| Larrazabal, Me; Lassus, Patrick; Maggi, Pierre; Bardouil, Michele. |
| A preliminary study of modern marine dinoflagellate cysts has been performed in Vilaine Bay through winters 1986, 1987 and 1989. Direct observations of muddy sand samples and most probable number (MPN) method applied to cysts have evidenced a low win ter species diversity with Spiniferites spp. and Scrippsiella sp. cysts as predominant species. Change in relative importance of maximum species diversity area from ycar to year suggests a possible action of bottom currents. A study of dormant stages of toxie dinoflagellates, genus Alexandrium and Dinophysis, has corroborated the occurrence of A. minutum cysts (IO to 30 cysts.g-I sediment) at low amounts and absence of Dinophysis sp. resting stages. More generally, comparison of cysts in sediments with summer... |
| Tipo: Text |
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| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00133/24472/22488.pdf |
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| Lassus, Patrick; Maggi, Pierre. |
| Le travail relaté ci-après a débuté en 1973. La partie expérimentale a duré 327 jours et a dû être intercalée entre les autres travaux en cours dans le laboratoire. De plus, elle nécessita pour chaque expérimentation l'obtention de femelles de crevettes graînées. D'où les délais qui nous ont été nécessaires pour publier ces résultats. Nous nous étions proposé de rechercher les éventuelles actions, de l'acidité et de la charge en fer de trois effluents, sur le développement larvaire d'un Crustacé. Nous avons expérimenté sur chacun des effluents en utilisant celui dont nous disposions au moment de l'expérimentation sans chercher à refaire des essais rigoureusement identiques sur les trois,vu les similitudes qui permettent une certaine extrapolation. |
| Tipo: Text |
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| Ano: 1977 |
URL: http://archimer.ifremer.fr/doc/00046/15759/13161.pdf |
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| Lassus, Patrick; Maggi, Pierre. |
| Dunaliella tertiolecta cultures, at the beginning of their exponential multiplication stage and acclimatized at 12, 16, 20 and 24°C, undergo sudden thermic rises, or a chloration of 0.5 mg/l or a combination of both treatments. As a result, the development of this flagellate is hardly affected by these thermic shocks since the maximal tested conditions (thermic rise of 17°C from an initial temperature of 24°C) only result in a very short growth delay. On the contrary, a chloration of 0.5 mg/l results in important delays in the development, with a total inhibition when a thermic shock also occurs. In this study, we continue our research on the effect of the transit of sea water in nuclear plant condensers on marine phytoplankton This aspect has already... |
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| Ano: 1980 |
URL: http://archimer.ifremer.fr/doc/1980/publication-6678.pdf |
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| Lassus, Patrick; Maggi, Pierre; Bessineton, Christophe. |
| A la fin du printemps 1978, le littoral normand a été le siège de profilérations inhabituelles d'algues microscopiques qui donnaient une coloration anormale à l'eau de mer sur plusieurs dizaines de kilomètres. Ce phénomène, largement commenté par les moyens d'information, a eu un impact régional important du fait des risques encourus par les consommateurs d'animaux marins à l'approche de la période estivale et du manque à gagner des professionnels de la mer. Venant quelques mois après la catastrophe de l'"Amoco-Cadiz" cette "marée rouge" a sensibilisé, une fois de plus, l'opinion publique aux problèmes de la pollution des mers. Pour toutes ces raisons il nous a paru opportun d'établir une mise au point sur les eaux colorées en baie de Seine pendant cette... |
| Tipo: Text |
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| Ano: 1980 |
URL: http://archimer.ifremer.fr/doc/1980/publication-7166.pdf |
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| Lassus, Patrick; Maggi, Pierre; Le Baut, Claire; Bardouil, Michèle; Bocquene, Gilles; Le Dean, Loïc; Truquet, Philippe. |
| In order to estimate the effects of chlorine used in cooling systems of electric power plants on zooplankton, some experiments have been realized with the four first larval stages of the prawn (P. serratus Pennant). Chlorine injection was performed by constant adding at 16 and 20 degree C with times exposures of 5, 15 and 25 minutes. If there is no detectable variations in sensitivity of different stages, toxic effects of oxydants issued from chlorination can be observed (for both the two acclimatation temperatures) at 15 minutes exposure with a LD 50 : 32 mg/l of chlorine. |
| Tipo: Text |
Palavras-chave: Palaemon serratus; Pollution effects; Larval development; Chlorine; Toxicity. |
| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/1981/publication-1886.pdf |
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| Lassus, Patrick; Maggi, Pierre; Proniewski, F.; Truquet, Philippe; Bardouil, Michele. |
| Since 1987 Antifer oil tanker terminal (Normandy, France) was weIl known, as a preferential area for summer highest blooms of Dinophysis cf acuminata, a toxic dinoflagellate. Three oceanographic cruises were made in August 1989, before, in the course of and after the seasonal max. of this species. Results obtained from these cruises (hydrological parameters and phytoplankton) as weIl as from a daily survey at a reference station in Antifer harbour, corrobora te the prevailing role of coastal up flowing of Seine estuarine waters, pushed to the coast by a dominant S - SW wind, on intensity and duration of Dinophysis bloom. Such observations are in agreement with those of Summer 1987 at reference station. |
| Tipo: Text |
Palavras-chave: Antifer; Dinophysis; Hydrologie; Phytoplancton; Antifer; Dinophysis; Hydrology; Phytoplankton. |
| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00138/24946/23039.pdf |
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| Lassus, Patrick; Maggi, Pierre; Proniewski, F.; Truquet, Philippe; Nizard, G.. |
| Time-related Dinophysis spp vertical profiles have been studyed during a 48 hours cycle in a submerged cylindric tank. A coïncidental Gymnodinium sp. (Scrippsiella trochoidea and Prorocentrum triestinum as companion species) red tide was believed to have strong effect on Dinophysis distribution in the upper layer during the tirst 24 hours cycle of the period of investigation (August 30-31, 1991). Between 24 and 48 hours, the sharp decrease of Dinophysis densities as well as the graduai decline observed in the red tide and in the vertical thermal gradient have resulted in a migration of dominant species : D. sacculus and D. cf. acuminata toward subsuperficiallevels (5 to 7 m.d) with a higher range in cells vertical movements. This behavior is very similar... |
| Tipo: Text |
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| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00138/24948/23041.pdf |
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| Lassus, Patrick; Martin, A; Maggi, Pierre; Berthome, Jean-paul; Langlade, Aime; Bachere, Evelyne. |
| Discolored waters and human diseases by shellfishes were dominant features of summer 1983 in south coast of Brittany. Vilaine Bay, the most damaged area, was successively affected by brown waters in early June, and diarrhetic intoxications by harvested mussels (July and August), just as DPS producing dinoflagellate (D. acuminata ) reached higher water or mussel guts concentrations than years before. Outspreading in the whole south coast of Brittany and possible relation with hydrological or biological parameters are analyzed. |
| Tipo: Text |
Palavras-chave: Brittany; France; ANE; Protista; Dinophysis acuminata; Shellfish culture; Red tides; Biological poisons; Toxicants. |
| Ano: 1983 |
URL: http://archimer.ifremer.fr/doc/1983/publication-1805.pdf |
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| Registros recuperados: 49 | |
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