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Registros recuperados: 38
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A Software Package and Hardware Tools for in situ Experiments in a Lagrangian Reference Frame ArchiMer
Doglioli, Andrea; Nencioli, Francesco; Petrenko, Anne; Rougier, Gilles; Fuda, Jean-luc; Grima, Nicolas.
The Lagrangian Transport Experiment (LATEX) was developed to study the influence of coupled physical and biogeochemical dynamics at the meso- and submesoscales on the transfers of matter and heat between the coastal zone and the open ocean. One of the goals of the Latex10 field experiment, conducted during September 2010 in the Gulf of Lion (northwest Mediterranean), was to mark a dynamical mesoscale feature by releasing a passive tracer [sulfur hexafluoride (SF6)] together with an array of Lagrangian buoys. The goal was to release the tracer in an initial patch as homogeneous as possible in the horizontal, and to study its turbulent mixing and dispersion while minimizing the contribution due to advection. For that, it was necessary to continuously adjust...
Tipo: Text Palavras-chave: Dispersion; Lagrangian circulation; Transport; Ship observations; Tracers; Experimental design; Software.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00155/26590/24719.pdf
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An operational model to simulate post-accidental radionuclide transfers in Toulon marine area: preliminary development ArchiMer
Duffa, Celine; Dufois, Francois; Coudray, Sylvain.
As part of its development of post-accident management tools, the French Institute for Radiological Protection and Nuclear Safety is setting up a model to simulate radionuclide dispersion in the Toulon marine area (one of France's main military ports). The model is based on the MARS 3D code developed by IFREMER. It reproduces hydro-sedimentation phenomena in the Bay of Toulon with a horizontal spatial resolution of 100 m and 30 vertical sigma levels and also factors in radioactive decay and dissolved/particulate distribution of the radionuclides studied. With no tide, the major currents in this area are generated by the wind. The model effectively reproduces the resulting hydrodynamic phenomena, which were measured throughout the summer of 2009 in the...
Tipo: Text Palavras-chave: Bay of Toulon; Radionuclides; Dispersion; MARS.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00053/16465/15998.pdf
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Colonization of artificial substrata by teredinid larvae released from a previously infested focus at Ilha Grande Bay, RJ BABT
Varotto,Ricardo Silva; Barreto,Cristine Costa.
The colonization pattern of wooden panels by teredinid larvae released from a previously infested focus was investigated. Panels were placed at different distances (1, 10, 20m) and in different directions from the focus. The colonization experiment took place at Parcel do Aleijado, Ilha Grande Bay, RJ. The focus remained immersed in nearly surface water, by the coast, during three months for infestation by teredinids. After this period, it was transferred to the study site. The infested focus and colonization panels remained in water, 10m deep, for three months more. Total density and density of the dominant species were considered for each group of panels. Five teredinid species were found: Bankia fimbriatula, Bankia gouldi, Lyrodus floridanus, Lyrodus...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Teredinidae; Colonization; Benthic ecology; Dispersion.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000400002
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Comparative study of potential transfer of natural and anthropogenic cadmium to plankton communities in the North-West African upwelling ArchiMer
Auger, Pierre-amael; Machu, Eric; Gorgues, Thomas; Grima, Nicolas; Waeles, Mathieu.
A Lagrangian approach based on a physical-biogeochemical modeling was used to compare the potential transfer of cadmium (Cd) from natural and anthropogenic sources to plankton communities (Cd-uptake) in the NorthWest African upwelling. In this region, coastal upwelling was estimated to be the main natural source of Cd while the most significant anthropogenic source for marine ecosystem is provided by phosphate industry. In our model experiment, Cd-uptake (natural or anthropogenic) in the North-West African upwelling is the result of an interplay between the Cd dispersion (by advection processes) and the simulated biological productivity. In the Moroccan waters, advection processes limit the residence time of water masses resulting in a low natural...
Tipo: Text Palavras-chave: Cadmium; North-West African upwelling; Phosphate industry; Dispersion; Bioaccumulation; Plankton ecosystem.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00252/36310/35200.pdf
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Ecologie larvaire de l'huître perlière (Pinctada margaritifera, L.), croissance et dispersion dans un lagon d'atoll polynésien ArchiMer
Thomas, Yoann.
Understanding key factors determining the bentho-pelagic species larval growth and dispersal remains one of the challenges of marine ecology, notably to understand the adult population structure and dynamics. In the present study, we explore this determinism on the development and dispersal of the black-lip pearl oyster (Pinctada margaritifera var. cumingii, Linné 1758) larvae in a French Polynesian atoll lagoon (Ahe, Tuamotu archipelago). Rearing of the pearl oyster for the production of black pearls takes on a major social and economic place in French Polynesia. However, the supply of pearl oyster seed to the farms depends entirely on the natural collection of wild spat of the only one specie P. margaritifera, and spatial and temporal variability of spat...
Tipo: Text Palavras-chave: Ecologie larvaire; Hétérogénéité environnementale; Modélisation; Croissance; Dispersion; Huître perlière à lèvres noires; Pinctada margaritifera; Lagon d’atoll; Polynésie française; Larval ecology; Environmental heterogeneity; Modeling; Growth; Dispersal; Black-lip pearl oyster; Pinctada margaritifera; Atoll lagoon; French Polynesia.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00003/11449/7999.pdf
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Essai d'une technique de tri sur post-larves de crevettes en sortie de nurserie et effets sur un grossissement intensif (Penaeus vannamei) ArchiMer
Aquacop,; Boutier, Laurent.
La technique de tri pratiquée avec une maille carrée de 2 mm est bonne et performante par son efficacité et son rendement. Elle est facilement mise en oeuvre sans main-d'oeuvre supplémentaire. Le grossissement des animaux triés montre un effet très positif pour les grandes post- larves avec une réduction de la dispersion et un gain en indice de conversion. Pour les petites post-larves c'est l'inverse avec une augmentation de dispersion et de mortalité dû à une forte présence de queues de lôt.
Tipo: Text Palavras-chave: Crevette pénéide; Post-larve; Nurserie; Tri; Grossissement; Dispersion.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00446/55751/57412.pdf
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Estudio de la contaminación con hidrocarburos de un ecosistema de manglar en cayo Santa María, Jardines del Rey, Cuba OceanDocs
Bermúdez Acosta, Jelvys; González Delgado, Alejandro; Castro Hernández, Yoelvis; Ortiz Guilarte, Eudalys; Núñez Moreira, Roberto; Oramas García, Julio; García García, Yaliany.
El propósito de esta investigación fue estudiar la contaminación de un ecosistema de manglar impactado con hidrocarburos en el sector centro sur de Cayo Santa María, Jardines del Rey, Cuba. Para el estudio de los indicadores microbiológicos y fisicoquímicos fue diseñado un muestreo estratificado, donde se seleccionaron dos estratos y diez estaciones de muestreo, considerando los patrones de flujos de marea en pleamar y bajamar, así como el impacto perceptible de la contaminación. La determinación de las poblaciones de microorganismos heterótrofos totales (BHT) y degradadores de petróleo (BDP) en agua y sedimentos se realizó por el método de conteo de colonias, expresadas como UFC·mL-1 o UFC· g-1 según la matriz de análisis. El contenido de hidrocarburos...
Tipo: Journal Contribution Palavras-chave: ASW; Cuba; Degradation; Dispersion; Hydrocarbons; Microorganisms; Pollution.
Ano: 2014 URL: http://hdl.handle.net/1834/5912
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Fonctionnement hydrodynamique du bassin de Thau. Validation écologique d’un modèle numerique de circulation (programme Écothau) ArchiMer
Millet, B.
The wind-driven flow in the closed bassin de Thau is reproduced with a two-dimensional numerical model of horizontal ciruclation using an Alternate Direction Implicit scheme. A stochastic analysis of frequencies on a yearly time scale of the velocity fields computed in the model and a spatial and stochastic treatment of the term (H2 y2), similar to an effective coefficient of horizontal dispersion by shear effect are presented. This approach will allow the delineation, in a stochastic manner, of the main structures of the circulation in the lagoon and the spatial heterogeneity of its ecohydrodynamic features. Two attempts of analogical research are presented, with sorne examples of the spatial structure in the phytoplankton biomass and the map of the...
Tipo: Text Palavras-chave: Lagune; Modèle; Circulation; Dispersion; Sédiment; Lagoon; Model; Circulation; Dispersion; Sediment.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/00323/43399/43093.pdf
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Frugivory by the White-bearded Manakin (Manacus manacus, Pipridae) in restinga forest, an ecosystem associated to the Atlantic forest Biota Neotropica
Cestari,César; Pizo,Marco Aurélio.
Manakins (Pipridae) are one of the most abundant fruit-eaters and seed dispersers in the understory of neotropical forests. We describe the fruit diet of the White-beaded Manakin (Manacus manacus) based on a two-year study of its foraging behavior on fruiting plants, collecting seeds from feces and regurgitations of trapped individuals, and from lekking males' courts in restinga forests at the southern coast of the state of São Paulo, Brazil. Manacus manacus consumed 58 species of fruits from 30 different plant families. Fruits were taken at 3.5 ± 1.9 m height and 1.5 ± 1.6 m below the forest canopy using mainly sally-strike and glean manoeuvres. Most of the fruits were berries ranging from 3.1 to 17 mm in diameter and containing from 1 to 86 seeds. Fruits...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Dispersion; Fruits; Animal-plant interaction; Seeds.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000200345
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Gas-liquid flow dispersion in a vertical pipe IPB - Escola Superior Agrária
Garcia, Valdemar; Teixeira, João Sobrinho.
The main purpose of this work was to analyse the transport f a solute dissolved in a flowing liquid in upward direction at low velocity along a vertical column, in the bottom of which slugs are injected. These experiments were carried out in a column with an internal diameter of 19 mm and height of 344.2 cm. Liquid flowrates of 1.0, 2.5 and 5.5 cm3/s were utilized, and an enlarged variety of gas flowrates were injected; in these conditions the slugs were normally formed at a frequency between 0.78 and 88.1 s-1. The scientific techniques used in this study based on the measurement, at the top of the column, of a tracer solution injected in its bottom. A simplified physical model was developed to explain the results obtained, which was based on two...
Tipo: BookPart Palavras-chave: Gas-liquid flow; Slugs; Wake of slug; Dispersion; Vertical tube.
Ano: 2000 URL: http://hdl.handle.net/10198/2268
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Geostatistics applied to the study of the spatial distribution of Tibraca limbativentris in flooded rice fields Ciência Rural
Pazini,Juliano de Bastos; Botta,Robson Antonio; Seidel,Enio Júnior; Silva,Fernando Felisberto da; Martins,José Francisco da Silva; Barrigossi,José Alexandre Freitas; Rübenich,Rodrigo.
Tibraca limbativentris (rice stem bug) is an insect highly injurious to the rice crop in Brazil. The aim of this research was to define the spatial distribution of the T. limbativentris and improve the sampling process by means of geostatistical application techniques and construction of prediction maps in a flooded rice field located in the "Planalto da Campanha" Region, Rio Grande do Sul (RS), Brazil. The experiments were conducted in rice crop in the municipality of Itaqui - RS, in the crop years of 2009/10, 2010/11 and 2011/12, counting fortnightly the number of nymphs and adults in a georeferenced grid with points spaced at 50m in the first year and in 10m in the another years. It was performed a geostatistical analysis by means adjusting...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oryza sativa; Rice stem bug; Dispersion; Monitoring.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000601006
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Identificación de corredores biológicos potenciales para el jaguar (Panthera Onca) en Sierra Abra Tanchipa, San Luis Potosí y sus límites estatales. Colegio de Postgraduados
Dueñas López, Gmelina.
Los jaguares (Panthera onca) debido a sus amplios ámbitos hogareños son susceptibles a los efectos de la fragmentación. Para disminuir tales efectos, los corredores biológicos han sido propuestos como una herramienta para conectar poblaciones aisladas. La Sierra Madre Oriental (SMO) es una unidad de conservación para los jaguares que se considera con baja probabilidad de sostener poblaciones. Se identificaron corredores biológicos potenciales para el jaguar dentro de la SMO, por medio de técnicas de reconocimiento espacial. Mediante el algoritmo Maxent se identificaron parches de hábitat potencial, y a partir del Proceso Jerárquico Analítico y la Combinación Lineal Ponderada se generó una matriz de resistencia. El modelo con los corredores potencialmente...
Palavras-chave: Dispersión; SIG; Rutas de menor costo; Stepping-stone; Dispersion; GIS; Least cost path; Ganadería; Maestría.
Ano: 2013 URL: http://hdl.handle.net/10521/2030
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Identificación, dispersión, histopatología e impacto económico de Armillaria en aguacate en Charapan, Michoacán. Colegio de Postgraduados
Michua Cedillo, Jeny.
La identificación, dispersión e impacto económico de Armillaria sp. en aguacate Hass se estudió en el municipio de Charapan, Michoacán. Armillaria se aisló de raíces de árboles sintomáticos y muertos y se cultivó en BDS. La identificación de la especie se realizó por compatibilidad somática y amplificación de la región IGS-I del ADN ribosomal de 19 aislamientos. Los apareamientos dieron como resultado un solo grupo de compatibilidad; los confrontamientos se realizaron con A. mellea, A. gallica y A. mexicana, donde se observó la separación de las colonias. Las pruebas de patogenicidad se realizaron inoculando 35 plántulas de aguacate en condiciones de invernadero. Las raíces de las plántulas infectadas y de los árboles infectados naturalmente en campo se...
Palavras-chave: Compatibilidad somática; Dispersión; Fenoles; IGS; Incidencia; Inoculación; Rizomorfos; Somatic compatibility; Dispersion; Phenols; Incidence; Inoculation; Rhizomorphs; Fitopatología; Maestría.
Ano: 2014 URL: http://hdl.handle.net/10521/2218
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Infection characteristics of Himasthla elongata cercariae in cockles as a function of water current ArchiMer
De Montaudouin, X; Wegeberg, Am; Jensen, Kt; Sauriau, Pg.
Digenean trematodes are widespread parasites of marine fauna. The first intermediate host of Himasthla elongata (Echinostomatidae) is the periwinkle Littorina littorea. The second host is less specific, as it includes Various bivalve species. The definitive host is a waterbird. The free-living cercaria acts to ensure transmission from the first and second intermediate hosts. We examined the impact of water flow (still and running water) and host size (6-8, 8-10, 10-12 mm shell length classes) on the settling success of H. elongata cercariae in the second intermediate host by utilizing the common cockle Cerastoderma edule. Under 2 scenarios (free-stream velocity of 0 and 6 cm s(-1)) more than 90% of the experimental population of cockles (90 individuals per...
Tipo: Text Palavras-chave: Cerastoderma edule; Cercariae; Dispersion; Flume; Himasthla elongata; Metacercariae; Transmission efficiency; Trematode.
Ano: 1998 URL: https://archimer.ifremer.fr/doc/00446/55807/62267.pdf
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Insect drift and the case of Mayrinia curvidens (Mayr) (Hemiptera: Pentatomidae) drift on the southern atlantic coast of Brazil Neotropical Entomology
Lazzari,Sonia M.N.; Panizzi,Antônio R.; Grazia,Jocélia.
Insect drift on shore of lakes and seas is a relative common phenomenon although apparently not frequently reported in the literature. Here we review the worldwide occurrence of insect drift with emphasis on Heteroptera, and speculate on possible causes to explain such phenomenon. The dramatic drift of million of specimens of the pentatomid Mayrinia curvidens (Mayr) on the shore of the southern coast of the Atlantic ocean in Brazil is reported for the first time. This drift, previously observed to occur in the mid 70’s on the coast of Paraná state with minor intensity (A.R. Panizzi, unpublished) was again observed on January 2006 along the Atlantic coast of Paraná (latitude 25º 45’ S), where an estimated population of 16 to 18 million of dead specimens of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Heteroptera; Stink bug; Atmospheric condition; Insect flight; Dispersion; Sea.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2008000200001
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In-situ database toolbox for short-term dispersion model validation in macro-tidal seas, application for 2D-model ArchiMer
Bailly Du Bois, P.; Dumas, Franck; Solier, L.; Voiseux, C..
Appropriate field data are required to check the reliability of hydrodynamic models simulating the dispersion of soluble substances in the marine environment. This study deals with the collection of physical measurements and soluble tracer data intended specifically for this kind of validation. The intensity of currents as well as the complexity of topography and tides around the Cap de La Hague in the centre of the English Channel make it one of the most difficult areas to represent in terms of hydrodynamics and dispersion. Controlled releases of tritium-in the form of HTO-are carried out in this area by the AREVA-NC plant, providing an excellent soluble tracer. A total of 14,493 measurements were acquired to track dispersion in the hours and days...
Tipo: Text Palavras-chave: Modelling; Data collection; Tritium; Dispersion; Tidal dynamics; English Channel.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00077/18775/16484.pdf
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Lluvia de semillas y emergencia de plántulas de Pinus patula Schl. et Cham. en Zacualtipán, Hidalgo. Colegio de Postgraduados
Castillo Aguilar, Ofelia.
La presente investigación es un aporte para entender el comportamiento de la repoblación de Pinus patula Schl. et Cham. en el ejido La Mojonera, Zacualtipán, Hidalgo. Se eligieron dos sitios de una hectárea cada uno. En el primero se aplicó el método de árboles padres (SCM), mientras que el segundo se mantuvo en condición natural (SSM). Para estimar la lluvia de semillas, emergencia y supervivencia de plántulas, así como el número de semillas viables almacenadas en el reservorio del suelo, cada sitio se dividió en 100 cuadros de 10 x 10 m. De manera aleatoria se instalaron 40 trampas circulares de 0.5 m2 cada una, rectángulos de 2m2 y se extrajeron muestras de 3 cm de profundidad en 40 cuadros de 0.5 m2 cada uno para ambos sitios. Estas muestras se...
Palavras-chave: Dispersión; Repoblación; Arboles padres; Supervivencia; Causas de mortalidad; Semilla viable; Porcentaje de germinación; Sitios con y sin manejo; Dispersion; Regeneration; Parent trees; Survival; Mortality causes; Viable seed; Germination percentage; Sites with and without management; Forestal; Maestría.
Ano: 2013 URL: http://hdl.handle.net/10521/1951
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Mineralogia, química e estabilidade de agregados do tamanho de silte de solos da Região Sudeste do Brasil. Repositório Alice
VITORINO, A.C.T.; FERREIRA, M.M.; CURI, N.; LIMA, J.M. de; SILVA, M.L.N.; MOTTA, P.E.F. da.
Com o objetivo de avaliar a relação da composição mineralógica e química do solo com a estabilidade de agregados do tamanho de silte, foram realizados estudos utilizando-se amostras de horizontes A e B de diversos solos da Região Sudeste do Brasil. Amostras de TFSA foram dispersas a 12.000 rpm por 20 minutos e a fração silte foi separada por esgotamento da fração argila, constituindo-se na fração denominada pseudo-silte, a qual foi sonificada, separando-se a fração argila desagregada (por sifonamento) da fração silte propriamente dita. Estudos de correlação mostraram que as composições mineralógica e química dos solos têm efeito marcante na dispersão de argila, com reflexos na fração silte. Maiores teores de gibbsita refletem em maior estabilidade dos...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Composição química; Argila; Dispersão; Chemical composition; Mineral; Clay; Dispersion.
Ano: 2002 URL: http://www.alice.cnptia.embrapa.br/handle/doc/108869
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Modele tridimensionnel de circulation et de dispersion ArchiMer
Thouvenin, Benedicte; Salomon, J.
Bottom topography, coastal morphology and density variations are the three factors influencing marine current flow in Seine Bay. Numerical modeling allows the study of this tridimensional structure.
Tipo: Text Palavras-chave: Hodographs; Salinity gradients; Coastal zone; Bottom topography; Mathematical models; Tidal currents; Dispersion; Water circulation.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1260.pdf
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Modélisation de la dispersion du phosphogypse dans le golfe de Gabès OceanDocs
Bejaoui, B.; Raïs, S.; Koutitonsky, V..
This work concerns the modeling of the phosphogypsum dispersion emitted by the chemical industries in the gulf of Gabès. The CORMIX model based on the dimensional analysis theory is used for this study. An analysis of the sensitivity of the model parameters was initially made; eight simulations were then carried out to determine the space extent of pollution on the level of the gulf. For each condition of tide, we carried out four simulations, two concerns the high tide and two concerns the low tide. Simulations showed that pollution by phosphogypsum is spread out in space over a surface of about 60 km2.
Tipo: Journal Contribution Palavras-chave: Numerical modeling; Modélisation numérique; Gabès; Dispersion; CORMIX; Phosphogypse; Phosphogypsum; Golfe de Gabès Dispersion Chemical pollutants MED Tunisia Gabes Gulf Marine pollution Mathematical models Mathematical models http://aims.fao.org/aos/agrovoc/c_24199.
Ano: 2004 URL: http://hdl.handle.net/1834/1555
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