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Registros recuperados: 11
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Comparison of methods for measuring denitrifying activity in marine-sediments from the western mediterranean coast ArchiMer
Raymond, N; Bonin, P; Bertrand, Jc.
Different types of denitrification rates in coastal marine sediments from the Western Mediterranean coast (France) were simultaneously determined by varioUS C2H2 inhibition techniques: in situ denitrifying activity in intact cores or sediment slurries; DEA (Denitrifying Enzyme Assays); and potential activity. Denitrifying activity was also estimated by the use of kinetic parameters (Km and V(max)). Values for denitrifying activities in the top two centimetres ranged from 0 to 50-mu-moles of nitrous oxide produced per litre of sediment per day, and were similar when intact core or sediment slurries were used. DEA showed comparable values for all the study sites. The potential activity ranged from 298-600-mu-moles per litre per day. Estimated activity based...
Tipo: Text Palavras-chave: DENITRIFICATION; C2H2 BLOCKAGE; MARINE SEDIMENT; MEDITERRANEAN.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/00100/21148/18767.pdf
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Instabilité des alliances stratégiques asymétriques : cas des relations entre les firmes multinationales et les entreprises locales agroalimentaires en Méditerranée Inra
Cheriet, F..
Les alliances stratégiques connaissent un fort développement tant par rapport aux pratiques organisationnelles des firmes qu’en termes de recherches académiques en stratégie. De nombreuses controverses subsistent quant à leurs issues (survie, longévité, performances, échecs, instabilité) et au rôle ambigu de l’asymétrie de taille entre les partenaires. L’objet de notre recherche est d’analyser les effets de la configuration de l’alliance stratégique asymétrique et ceux de sa dynamique d’évolution sur les principales formes de son instabilité. Notre application empirique a concerné les alliances stratégiques entre les firmes multinationales et les entreprises locales agroalimentaires en Méditerranée. Un échantillon de 105 cas d’alliances stratégiques...
Tipo: Thesis Palavras-chave: ALLIANCE STRATEGIQUE; ASYMETRIE; INSTABILITE STRATEGIC ALLIANCE; SIZE ASYMETRY; INSTABILITY; AGRIFOOD INDUSTRY; MEDITERRANEAN.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200954e75792&uri=/notices/prodinra1/2009/09/
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Introduction et invasion de l'algue tropicale Caulerpa taxifolia en Méditerranée nord-occidentale ArchiMer
Meinesz, A; Hesse, B.
The tropical alga Caulerpa taxifolia (Vahl) C. Agardh has been displayed over the last fifteen years in tropical aquaria at the Oceanographic Museum, Monaco. Its accidental introduction into the natural environment dates from 1984. It developed first in the sea immediately below the museum, and resisted winter temperatures of 11 to 13-degrees-C. Gradually the population spread over all types of substrate, including rock, sand and mud, and over a wide range of depth, 3 to 35 m, on this relatively exposed site. In summer 1990 we became aware of its presence both to the east and to the west of Monaco. To the east, it now occurs on the whole of the eastern side of Cap Martin (3 km from Monaco) and is spreading over the west face. To the west we have observed...
Tipo: Text Palavras-chave: INTRODUCED SPECIES; CAULERPA-TAXIFOLIA; MEDITERRANEAN.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00101/21268/18879.pdf
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Invasive rats and seabirds after 2,000 years of an unwanted coexistence on Mediterranean islands Inra
Ruffino, L.; Bourgeois, K.; Vidal, E.; Duhem, C.; Paracuellos, M.; Escribano, F.; Sposimo, P.; Baccetti, N.; Pascal, M.; Oro, D..
In the Mediterranean, the survival of endemic long-lived seabirds despite the long-standing introduction of one of the most damaging alien predator, the ship rat (Rattus rattus), on most islands constitutes an amazing conservation paradox. A database gathering information on approximately 300 Western Mediterranean islands was analyzed through generalized linear models to identify the factors likely to influence ship rat presence and to account for how ship rat presence and island characteristics may have driven the presence and abundance of seabirds. Our review showed that few Mediterranean islands remain rat-free. At the regional scale, rat presence was only a limiting factor in the abundance of the smallest seabird, the storm petrel (Hydrobates...
Tipo: Journal Article Palavras-chave: PROCELLARIIDAE; OISEAU MARIN; PUFFINUS YELKOUAN; PUFFINUS MAURETANICUS; CALONECTRIS DIOMEDEA; HYDROBATES PELAGICUS; ESPECE INVASIVE; INVASION BIOLOGIQUE; PREDATEUR; PREDATION; ILE; MILIEU INSULAIRE; DISTRIBUTION GEOGRAPHIQUE ISLANDS; MEDITERRANEAN; PROCELLARIIFORMES; COEXISTENCE; INTRODUCED PREDATORS.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20099e346ad8&uri=/notices/prodinra1/2010/11/
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Inventaire des plantes introduites en Méditerranée : origines et répercussions sur l'environnement et les activités humaines ArchiMer
Verlaque, M.
This review addresses the problem of recently introduced plants in the Mediterranean in order to analyse their vectors, the dispersal processes and the possible ecological and economic consequences. Ninety-five cases (94 macroscopic algae and one seagrass) are listed and discussed. Three major routes of access into the Mediterranean are indicated: shipping, the Suez canal and aqua-culture. The recent introduction of Caulerpa taxifolia along our coasts has called attention to a new potential source: aquaria. Among the successful acclimatizations, cold-temperate Pacific and Atlantic species remain confined to the north of the Mediterranean (Gulf of Lions, Adriatic), whereas some tropical or sub-tropical plants colonize large areas. Some introduced algae...
Tipo: Text Palavras-chave: MEDITERRANEAN; INTRODUCED SPECIES; MARINE ALGAE; SEAGRASSES; ECOLOGICAL AND ECONOMIC CONSEQUENCES.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00098/20879/18493.pdf
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Investigation of anthropogenic and natural organic inputs in estuarine sediments using hydrocarbon markers (nah, lab, pah) ArchiMer
Bouloubassi, I; Saliot, A.
Surface sediments were collected in the Rhone delta, NW Mediterranean, at two seasons and analyzed for composition of non-aromatic hydrocarbons (NAH), long-chain linear alkylbenzenes (LAB) and polycyclic aromatic hydrocarbons (PAH) by GC and GC/MS following fractionation by normal phase HPLC. Concentrations varied from 21.2 to 166.7 mu/g for NAH, from 2097.9 to 9324.2 ng/g for total PAH and from 342.5 to 2713.0 ng/g for LAB. These levels are comparable to those reported for other coastal areas worldwide in the vicinity of important urban and industrial activities. Detailed analysis permitted identification of several contributions to the bulk sedimentary hydrocarbon mixture from fossil fuel related sources, pyrolytic processes, domestic wastes as well as...
Tipo: Text Palavras-chave: ANTHROPOGENIC NATURAL INPUTS; ESTUARY; HYDROCARBONS; MEDITERRANEAN; SEDIMENTS.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00099/21043/18669.pdf
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Modeling the barotropic tides in the strait of sicily and tunisian shelf ArchiMer
Molines, Jm.
In order to check the sea-level variability in the vicinity of Lampedusa Island (in the frame of Topex/Poseidon altimeter calibration), a numerical model of the tides for the Strait of Sicily and adjacent area has been performed. Cotidal and co-range charts for the main diurnal and semidiurnal constituents are drawn and the model results are compared with in situ data. Position of amphidromes for these constituents is also clarified: a strong semidiurnal resonance observed in the Gulf of Gabes is well reproduced in the model. Semidiurnal tidal currents are found to be important at the Adventure Bank (South-West of Sicily) and in the Gulf of Gabes. Diurnal tidal current, dominant on Adventure Bank, are due to energy trapped around the Western extremity of...
Tipo: Text Palavras-chave: NUMERICAL MODELS; TIDES; HARMONIC CONSTITUENTS; MEDITERRANEAN; STRAIT OF SICILY.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00101/21254/18867.pdf
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Modelling small ruminant systems in Mediterranean areas Inra
Jouven, M.; Baumont, R.; Ingrand, S.; Bocquier, F..
This paper examines the issues and requirements of simulation models for small ruminant systems in Mediterranean areas. Due to the absence of published models suited to these systems, we analyze the features of existing models designed for other species and other geographical areas, but focussed on similar issues (adaptive abilities of the females, feed self-sufficiency, sustainable use of rangeland). Flock and land heterogeneity, which are described in these models, should be given high interest, since they are typical of small ruminant systems in Mediterranean areas. Setting precise modelling objectives in relation to the final users, and exploiting complementary sources of information including expert knowledge are basic conditions for building a...
Tipo: Conference Paper Palavras-chave: MODEL; SIMULATION; FARM; FLOCK; FORAGE RESOURCES; RANGELAND; GRAZING; MEDITERRANEAN.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009d2898104&uri=/notices/prodinra1/2011/03/
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Modelling small ruminant systems in Mediterranean areas Inra
Jouven, M.; Baumont, R.; Ingrand, S.; Bocquier, F..
Cet article traite des enjeux et des cahiers des charges pour des modèles de simulation desystèmes d’élevage de petits ruminants en zones méditerranéennes. Comme peu de modèles publiés sontadaptés à ces systèmes, nous analysons les caractéristiques de modèles existants conçus pour d’autresespèces et d’autres régions, mais traitant d’enjeux similaires (capacités adaptatives des femelles,autonomie alimentaire de l’exploitation, utilisation durable des parcours). L’applicabilité de leurs équationset de leurs représentations conceptuelles aux systèmes de petits ruminants est discutée. L’hétérogénéité dutroupeau et des ressources fourragères, mais aussi la variabilité des ressources entre saisons et entreannées, sont des éléments importants, car typiques des...
Tipo: Journal Article Palavras-chave: MODEL; LIVESTOCK SYSTEM; GRAZING; MEDITERRANEAN; SMALL RUMINANTS.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201075cf8ba7&uri=/notices/prodinra1/2010/09/
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Structure et organisation de l'étang de Thau d'après la faune benthique (macrofaune, méiofaune). Relations avec le confinement ArchiMer
Guelorget, O; Perthuisot, Jp; Lamy, N; Lefebvre, A.
The biogeological organization of Thau lagoon was investigated through the granulometric analysis of surficial sediments and study of the qualitative and the quantitative distribution of benthic macrofauna and meiofauna. These show clearly that the lagoonal system is organized according to confinement as conceived by Guelorget and Perthuisot (1983 a; 1992), which depends upon the rate of exchanges with the open sea and the hydrodynamic pattern of the basin. The latter appears to be composed of a pair of lagoonal subsystems separated by a hydrodynamically unstable barrier. The northern subsystem displays the classical concentric organization of Mediterranean lagoons with a clearly defined hydraulic umbilicus. The southern subsystem displays a transverse...
Tipo: Text Palavras-chave: LAGOON; MACROZOOBENTHOS; MEIOBENTHOS; CONFINEMENT; MEDITERRANEAN.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00098/20880/18494.pdf
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Water-level variations in the northern levantine sea ArchiMer
Yuce, H; Alpar, B.
Characteristics of water level variations in the northern Levantine Sea have been investigated by reference to a sequence of hourly water level observations at Antalya and Iskenderun. Long and short period oscillations of non-tidal origin have been identified. Long-period oscillations (several days) correspond to variations in barometric pressure; the short-period oscillations (2.8 to 4.6 hours) can be attributed to seiche-like motions. The tidal oscillations are small in amplitude, with a spring range of 21 and 41 cm in Antalya and Iskenderun respectively. Tidal oscillations are dominated by semi-diurnal constituents. The seasonal fluctuations of monthly mean sea level show two maxima and two minima; the major minimum occurs in March and is followed by a...
Tipo: Text Palavras-chave: SEA LEVELS OSCILLATIONS; TIDAL VARIATIONS; POWER SPECTRA; LEVANTINE; MEDITERRANEAN.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00098/20888/18502.pdf
Registros recuperados: 11
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