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Registros recuperados: 6
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Analysis of hydrobiological pattern in the Bizerte lagoon (Tunisia) ArchiMer
Bejaoui, B; Harzallah, A; Moussa, M; Chapelle, Annie; Solidoro, C.
This study deals with the use of a multivariate analysis method in order to understand the functioning of the Bizerte lagoon ecosystem. A set of hydrobiological parameters was collected during 10 monthly campaigns in 2004. A variant of the EOF (Empirical Orthogonal Function) technique is used to examine hydrobiological variability modes in this lagoon. The permanent features characterising the lagoon are obtained by applying the EOF technique to data after removing the annual cycle. Two major modes were obtained. The first one shows a contrast between the northern sector of the lagoon, influenced by the Mediterranean Sea, and the southern one influenced by continental waters. This mode is mostly prominent for temperature and salinity. The second mode shows...
Tipo: Text Palavras-chave: Nutrient cycles; EOF analysis; Bizerte lagoon.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4808.pdf
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Atmospherically-promoted photosynthetic activity in a well-mixed ecosystem: Significance of wet deposition events of nitrogen compounds ArchiMer
Boulart, C; Flament, Pierre; Gentilhomme, V; Deboudt, K; Migon, C; Lizon, F; Schapira, M; Lefebvre, Alain.
Wet atmospheric deposition of dissolved N, P and Si species is studied in well-mixed coastal ecosystem to evaluate its potential to stimulate photosynthetic activities in nutrient-depleted conditions. Our results show that, during spring, seawater is greatly depleted in major nutrients: Dissolved Inorganic Nitrogen (DIN), Dissolved Inorganic Phosphorus (DIP) and Silicic acid (Si), in parallel with an increase of phytoplanktonic biomass. In spring (March-May) and summer (June-September), wet atmospheric deposition is the predominant source (> 60%, relative to riverine contribution) for nitrates and ammonium inputs to this N-limited coastal ecosystem. During winter (October-February), riverine inputs of DIN predominate (> 80%) and are annually the most...
Tipo: Text Palavras-chave: Strait of Dover; Nutrient cycles; River plumes; Atmospheric deposition; Coastal zone; Primary production.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2007.pdf
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Modèle couple dynamique -écologie pour la lagune de Bizerte OceanDocs
Bejaoui, B.; Harzallah, A.; Moussa, M.; Chapelle, A..
This work concerns the development of a three dimensional hydroecological model based on two nutrient elements, nitrogen and phosphorus.The hydrodynamic model is 3D forced by monthly climatic data of NOAA. The ecological model was developed based on two nutrient elements, nitrogen and phosphorus in interaction with the phytoplankton and zooplancton. The ecological model is made up with two compartments, the water column and the sediment layer. Eight state variables are used to characterize the water column and six state variables for the sediment layer. As a first application, the model was tested on the Bizerte Lagoon. A comparison between simulations and observations showed that the model can reproduce with satisfactory way the observations carried out...
Tipo: Journal Contribution Palavras-chave: Dissolved oxygen; Hydrodynamics; Models; Nutrient cycles; Phytoplankton; Zooplankton.
Ano: 2008 URL: http://hdl.handle.net/1834/4264
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Modèle couple dynamique-écologie pour la lagune de Bizerte OceanDocs
Béjaoui, B.; Harzallah, A.; Moussa, M.; Chapelle, A..
Ce travail porte sur le développement d’un modèle hydroécologique tridimensionnel basé sur deux éléments nutritifs l’azote et le phosphore. Le modèle hydrodynamique est forcé par des données climatiques mensuelles NOAA. Le modèle écologique a été développé en se basant sur deux éléments nutritifs l’azote et le phosphore en interaction avec le phytoplancton et le zooplancton. Le modèle écologique est constitué de deux compartiments, la colonne d’eau et la couche supérieure de sédiment. Huit variables d’états caractérisent la colonne d’eau et six le compartiment sédiment. Comme première application, le modèle a été testé sur la lagune de Bizerte. Une comparaison entre les résultats des simulations et les observations a montré que le modèle a pu reproduire...
Tipo: Journal Contribution Palavras-chave: .; Dissolved oxygen; Hydrodynamics; Models; Nutrient cycles; Phytoplankton; Zooplankton; Dissolved oxygen; Models; Phytoplankton; Zooplankton; Hydrodynamics; Http://aims.fao.org/aos/agrovoc/c_36106; Http://aims.fao.org/aos/agrovoc/c_4881; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_3723.
Ano: 2008 URL: http://hdl.handle.net/1834/3694
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Papel funcional de los hongos en ecosistemas de manglar OceanDocs
Sosa-Rodríguez, T.; Sánchez-Nieves, J.; Melgarejo, L.M..
Los manglares son ecosistemas altamente productivos que tienen una gran diversidad de macro y microorganismos de relevancia ecológica y económica. Entre ellos, la actividad de los hongos habitantes del manglar es fundamental en el ciclaje de nutrientes y en la regulación del ecosistema. El conocmiento actual sobre estos organismos se ha dirigido hascia su diversidad, distribución, ecología, producción de sustancias antimicrobianas e interacciones planta-hongos como fitopatógenos o como simbiontes benéficos involucrados en procesos como la solubilización y movilización de fosfatos.
Tipo: Journal Contribution Palavras-chave: Fungi; Mangroves; Ecosystems; Nutrient cycles; Ecosystems; Fungi; Mangroves; Http://aims.fao.org/aos/agrovoc/c_2482; Http://aims.fao.org/aos/agrovoc/c_3145; Http://aims.fao.org/aos/agrovoc/c_16190.
Ano: 2009 URL: http://hdl.handle.net/1834/3576
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The problems of application of radiocarbon method for estimation of primary production in oligotrophic waters ArchiMer
Krupatkina, D; Berland, B; Maestrini, S.
The errors in primary production estimation by the radiocarbon method may differ from one trophic region to another. Such supposition is based on unequal phytoplanktonic structural characteristics of these regions. These errors are likely to appear rather significant in oligotrophic waters predominated by nano- and ultranano-plankton (the so-called picoplankton). The organic substance of oligotrophic waters is obviously produced by picoplankton for the most part, the need for clarifying possible errors when estimating primary production by the radiocarbon method, which is the purpose of the present work is urgent. For these topics in oligotrophic waters, measurements were carried out in two ways: (1) according to the generally accepted pattern (Sorokin,...
Tipo: Text Palavras-chave: Methodology; Community composition; Nutrient cycles; Phytoplankton; Ecosystems; Carbon 14; Primary production; Analytical techniques.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-1522.pdf
Registros recuperados: 6
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