Consulta: subjectFacets:"Dispersion"
Registros recuperados: 38
Data/hora: 01/06/2024 06:36:56

Identificación, dispersión, histopatología e impacto económico de Armillaria en aguacate en Charapan, Michoacán.
Provedor de dados: Depósito Institucional Abierto de Documentos Digitales del Colegio de Postgraduados (COLPOS DIGITAL )
Autores: 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

Identificación de corredores biológicos potenciales para el jaguar (Panthera Onca) en Sierra Abra Tanchipa, San Luis Potosí y sus límites estatales.
Provedor de dados: Depósito Institucional Abierto de Documentos Digitales del Colegio de Postgraduados (COLPOS DIGITAL )
Autores: 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

Lluvia de semillas y emergencia de plántulas de Pinus patula Schl. et Cham. en Zacualtipán, Hidalgo.
Provedor de dados: Depósito Institucional Abierto de Documentos Digitales del Colegio de Postgraduados (COLPOS DIGITAL )
Autores: 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

Movimento e área de uso do jacaré-do-pantanal.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: CAMPOS, Z. M. da S.; MOURÃO, G. de M.; COUTINHO, M. E.; MAGNUSSON, W.
O estudo dos padrões de movimento dos jacarés do Pantanal ocorreu em uma área de lagos isolados e em uma área cortada por rios intermitentes no Pantanal. Foram marcados jacarés em 100 lagos, na área de lagos (1986-2001), e em 2 rios, na área de rios (1987-1999), recapturados 163 machos adultos, 132 fêmeas adultas e 237 jovens e monitorados 67 jacarés adultos por radiotelemetria nas duas áreas. No intervalo de 2 anos, a maioria dos jovens moveram-se apenas dentro da área de lagos ou da de rios, numa distância máxima de 6,0 km (x = 0,5; DP = 1,0 km), na área de lagos, e de 1,25 km (x= 0,6; DP = 0,3 km), na área de rios. Somente cinco jovens marcados nos lagos foram recapturados depois de um intervalo de 5 a 10 anos. Um jovem permaneceu na área de lago e...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Yacare; Movement ecology; Dispersion; Caimans; Management.; Dispersão; Ecologia; Manejo; Jacaré; Movimento.; Pantanal.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/811107

Modele tridimensionnel de circulation et de dispersion
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

In-situ database toolbox for short-term dispersion model validation in macro-tidal seas, application for 2D-model
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Modélisation hydro-sédimentaire de la rade de Toulon : application à l’étude de la dispersion de radionucléides
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Dufresne, Christiane; Duffa, Céline; Rey, Vincent; Verney, Romaric.
L’objectif de ce travail est mettre en place un modèle hydro-sédimentaire de dispersion des radionucléides, comme outil d’aide à la décision suite à une hypothétique contamination marine accidentelle. Appliqué à la Rade de Toulon, il utilise le modèle MARS-3D pour l’étude hydrodynamique et le module MIXSED pour la dynamique des différentes classes de sédiments. Les cas d’application présentés concernent le césium et le plutonium, qui ont des affinités très différentes avec les sédiments fins. Les simulations de rejet, effectuées en fond de baie, montrent une variabilité saisonnière marquée, due aux conditions météorologiques typiques, mais aussi aux conditions de débit et de charge sédimentaire associée du fleuve Las, qui se jette dans la Rade. Ainsi, les...
Tipo: Text
Palavras-chave: Modélisation hydro-sédimentaire; Dispersion; Radionucléides; Toulon.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00348/45926/45619.pdf

STAMM : un modèle individu-centré de la dispersion active des tortues marines juvéniles. Applications aux cas des tortues luths du Pacifique Ouest et de l’Atlantique Nord-Ouest et aux tortues caouannes de l’ouest de l’océan Indien.
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Lalire, Maxime.
Sea turtles are increasingly threatened by the direct and indirect effects of human activities. Their life cycle is complex, shared between various, and often very distant, habitats. Their conservation therefore requires identifying the habitats occupied at each stage of life and the migration routes between these different habitats. While the spatial ecology of adult turtles is relatively well known, particularly through satellite monitoring, the situation is not the same for juveniles which pelagic development phase remains largely unobserved. In that context, numerical simulation constitutes an appropriate tool to explore the dispersal of juvenile sea turtles from their natal beaches. Until now, simulations were mostly performed under the assumption...
Tipo: Text
Palavras-chave: Courants marins; Dispersion; Ecologie spatiale; Modélisation lagrangienne; Modèles de mouvement; Modèles d'habitat; Simulations numériques; Tortues marines juvéniles; Tortue luth; Tortue caouanne; Oceanic currents; Dispersal; Spatial ecology; Lagrangian modelling; Movement modelling; Habitat modelling; Numerical simulations; Juvenile sea turtles; Leatherback turtle; Loggerhead turtle.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00497/60912/64263.pdf

Infection characteristics of Himasthla elongata cercariae in cockles as a function of water current
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

A Software Package and Hardware Tools for in situ Experiments in a Lagrangian Reference Frame
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Essai d'une technique de tri sur post-larves de crevettes en sortie de nurserie et effets sur un grossissement intensif (Penaeus vannamei)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Transport et mélange d'un rejet urbain dans le milieu marin - Mer Méditerranée
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Thouvenin, Benedicte.
Dans le cadre du programme national "REJETS URBAINS EN MER", développé par l'IFREMER, en collaboration avec l'Agence de Bassin Rhône Méditerranée Corse, des études sur le comportement d'un effluent émis par un émissaire en profondeur ont été réalisées. Complétant des mesures courantométriques et hydrologiques de longue durée, en un point à la sortie de l'émissaire de TOULON EST, deux modèles mathématiques ont été appliqués pour reproduire et étudier le rejet pendant les deux étapes de dilution. · Le modèle JET, développé par la SOGREAH, a été testé et comparé avec des mesures in situ. Les variations des résultats en fonction des conditions du milieu rencontrées pendant un cycle annuel ont été étudiées. Un modèle de transport et mélange multicouches a été...
Tipo: Text
Palavras-chave: Rejet urbain; Modèle mathématique; Rade de Toulon; Dispersion; Contamination.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/00132/24287/22285.pdf

TRANSMER, hydrodynamic model for medium- and long-term simulation of radionuclides transfers in the English Channel and southern North Sea
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bailly Du Bois, Pascal; Dumas, Franck.
TRANSMER hydrodynamic model simulates dispersion of dissolved substances in seawater at the scale of the English Channel and the south of the North Sea with a mesh size of one kilometre and a time step of 30 minutes. This model evaluates the medium- and long-term consequences of releases of soluble pollutants in the marine ecosystem under normal or accidental conditions, at a very low computation cost (it takes less than one hour to simulate one year). It has been qualitatively and quantitatively validated by 1400 measurements of 125Sb in seawater in the English Channel and the North Sea. Budgets of measured and simulated radionuclide quantities are balanced for theses seas. The correlation factor between individual measurements in seawater and calculation...
Tipo: Text
Palavras-chave: Pollutant; Ecosystem; Radionuclides; Dispersion; Dissolved substances; Hydrodynamic model.
Ano: 2005
URL: https://archimer.ifremer.fr/doc/2005/publication-552.pdf

Modélisation hydrodynamique de la dispersion à court terme dans une mer macrotidale: validation par des mesures à haute résolution de radiotraceurs solubles
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bailly Du Bois, Pascal; Dumas, Franck.
DISPRO project aims to validate hydrodynamic models dispersion parameters by field data for the short-term (hours to week) and short distances (100 meters to 30 km). This project is based on a 2D instantaneous currents model with a mesh size of 110 m, coupled with high frequency field data collected in the release plume. At this step of the works, measurements confirm the reliability of the model during six hours following a release. This validation made possible developpement of models with known incertitude to simulate dispersion of dissolved substances in realistic conditions for normal or accidental situations in macrotidal seas.
Tipo: Text
Palavras-chave: Validation; Tritium; Dispersion; North sea; Hydrodynamic model; Validation; Tritium; Dispersion; Manche; Modèle.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/acte-564.pdf

Comparative study of potential transfer of natural and anthropogenic cadmium to plankton communities in the North-West African upwelling
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Dissolved Radiotracers and Numerical Modeling in North European Continental Shelf Dispersion Studies (1982–2016): Databases, Methods and Applications
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bailly Du Bois, Pascal; Dumas, Franck; Voiseux, Claire; Morillon, Mehdi; Oms, Pierre-emmanuel; Solier, Luc.
Significant amounts of anthropogenic radionuclides were introduced in ocean waters following nuclear atmospheric tests and development of the nuclear industry. Dispersion of artificial dissolved radionuclides has been extensively measured for decades over the North-European continental shelf. In this area, the radionuclide measurement and release fluxes databases provided here between 1982 and 2016 represent an exceptional opportunity to validate dispersion hydrodynamic models. This work gives accessibility to these data in a comprehensive database. The MARS hydrodynamic model has been applied at different scales to reproduce the measured dispersion in realistic conditions. Specific methods have been developed to obtain qualitative and quantitative results...
Tipo: Text
Palavras-chave: Radionuclide; Tracer; Data collection; Antimony 125 (Sb-125); Tritium (H-3); Dispersion; Modeling; English Channel; North Sea; Biscay Bay.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00633/74521/74348.pdf

An operational model to simulate post-accidental radionuclide transfers in Toulon marine area: preliminary development
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Intercomparison of Three Open-Source Numerical Flumes for the Surface Dynamics of Steep Focused Wave Groups
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Vyzikas, Thomas; Stagonas, Dimitris; Maisondieu, Christophe; Greaves, Deborah.
NewWave-type focused wave groups are commonly used to simulate the design wave for a given sea state. These extreme wave events are challenging to reproduce numerically by the various Numerical Wave Tanks (NWTs), due to the high steepness of the wave group and the occurring wave-wave interactions. For such complex problems, the validation of NWTs against experimental results is vital for confirming the applicability of the models. Intercomparisons among different solvers are also important for selecting the most appropriate model in terms of balancing between accuracy and computational cost. The present study compares three open-source NWTs in OpenFOAM, SWASH and HOS-NWT, with experimental results for limiting breaking focused wave groups. The comparison...
Tipo: Text
Palavras-chave: Extreme waves; Focused waves; Dispersion; Harmonic analysis; CFD; OpenFOAM; SWASH; HOS.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00665/77755/79880.pdf

Ecologie larvaire de l'huître perlière (Pinctada margaritifera, L.), croissance et dispersion dans un lagon d'atoll polynésien
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Fonctionnement hydrodynamique du bassin de Thau. Validation écologique d’un modèle numerique de circulation (programme Écothau)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

TRANSMER, un modèle hydrodynamique rapide et précis pour la simulation à moyen et long terme des transferts de radionucléides en Manche et dans le sud de la Mer du Nord
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bailly Du Bois, Pascal; Dumas, Franck.
TRANSMER hydrodynamic model simulates dispersion of dissolved substances in seawater at the scale of the English Channel and the south of the North Sea with a mesh size of one kilometre and a time step of 30 minutes. It has been qualitatively and quantitatively validated by 1400 measurement of 125Sb in seawater. This model evaluates the medium- and long-term consequences of releases of soluble pollutants in the marine ecosystem under normal or accidental conditions, at a very low computation cost (it takes less than one hour to simulate one year).
Tipo: Text
Palavras-chave: English Channel; North Sea; Radionuclide; Concentration; Dispersion; Dissolved substances; Seawater; Hydrodynamic model; Modèle; Sb 125; Dispersion; Mer du Nord; Manche.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/acte-563.pdf

Open ocean regimes of relative dispersion
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Ollitrault, Michel; Gabillet, Céline; De Verdiere, Alain Colin.
As two fluid particles separate in time, the entire spectrum of eddy motions is being sampled from the smallest to the largest scales. In large-scale geophysical systems for which the Earth rotation is important, it has been conjectured that the relative diffusivity should vary respectively as D-2 and D-4/3 for distances respectively smaller and larger than a well-defined forcing scale of the order of the internal Rossby radius (with D the r.m.s. separation distance). Particle paths data from a mid-latitude float experiment in the central part of the North Atlantic appear to support these statements partly: two particles initially separated by a few km within two distinct clusters west and east of the mid-Atlantic ridge, statistically dispersed following a...
Tipo: Text
Palavras-chave: Taylor dispersion; Dispersion; Atlantic circulation; Particule pairs.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-456.pdf

Risks and management of non-native Impatiens species in the Netherlands
Provedor de dados: Naturalis Digital Academic Repository
Autores: Matthews, J.; Beringen, R.; Boer, E.; Duistermaat, H.; Odé, B.; Valkenburg, J.L.C.H. van; Velde, G. van der; Leuven, R.S.E.W.
Tipo: Report
Palavras-chave: Dispersion; Ecological effects; Invasive species; Management options; Public health; Socio-economic impacts; 42.54; 42.44.
Ano: 2015
URL: http://www.repository.naturalis.nl/record/579645

Insect drift and the case of Mayrinia curvidens (Mayr) (Hemiptera: Pentatomidae) drift on the southern atlantic coast of Brazil
Provedor de dados: Neotropical Entomology
Autores: 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

The ichthyofauna of drifting macrophyte mats in the Ivinhema River, upper Paraná River basin, Brazil
Provedor de dados: Neotropical Ichthyology
Autores: Bulla,Cíntia Karen; Gomes,Luiz Carlos; Miranda,Leandro Esteban; Agostinho,Angelo Antonio.
We describe the fish assemblages associated with drifting macrophyte mats and consider their possible role as dispersal vectors in the Ivinhema River, a major tributary of the upper Paraná River, Brazil. Fish associated with drifting mats were sampled in the main river channel during January and March 2005, when the wind and/or the increased water level were sufficient to transport macrophyte stands. Fish in the drifting mats were sampled with a floating sieve (4 m long x 2 m wide x 0.6 m high, and 2 mm mesh size). In the laboratory, larvae, juvenile, and adult fish were counted and identified to the lowest possible taxonomic level. In four drifting macrophyte mats we captured 218 individuals belonging to at least 28 species, 17 families, and 6 orders....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dispersion; Fish guilds; Floodplain; Free-floating plants; Freshwater fishes.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000200018

Modélisation de la dispersion du phosphogypse dans le golfe de Gabès
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: 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

Estudio de la contaminación con hidrocarburos de un ecosistema de manglar en cayo Santa María, Jardines del Rey, Cuba
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: 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

Reversibility of the Hardening Process of Plinthite and Petroplinthite in Soils of the Araguaia River Floodplain under Different Treatments
Provedor de dados: Revista Brasileira de Ciência do Solo
Autores: Martins,Angélica Pires Batista; Santos,Glenio Guimarães; Oliveira,Virlei Álvaro de; Maranhão,Deyvid Diego Carvalho; Collier,Leonardo Santos.
ABSTRACT Although ferruginous materials occur frequently in soils of tropical regions, information about the reversal of the hardening process of these materials is scarce. This study assessed the influence of different chemical treatments and periods of immersion on the reversibility of the hardening process of plinthite and petroplinthite in soils of the Araguaia River plain. Soil samples were collected from the plinthic horizons in 0.10 m high and 0.15 m diameter PVC cylinders and divided into subsamples with a rock hammer. Homogeneous petroplinthite samples were also collected and broken into subsamples with a rock hammer. The plinthite and petroplinthite subsamples were subjected to five immersion treatments: distilled water, calcium carbonate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dispersion; Deterioration of structural stability; Hardness; Reagents; Iron oxides.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100307

Study of the combined radial post-feeding dispersion of the blowflies Chrysomya megacephala (Fabricius) and C. albiceps (Wiedemann) (Diptera, Calliphoridae)
Provedor de dados: Revista Brasileira de Entomologia
Autores: Gomes,Leonardo; Von Zuben,Claudio José.
Blowflies use discrete and ephemeral substrates to feed their larvae. After they run out of food, the larvae begin to disperse in order to find adequate places for pupation or additional food sources, a process named post-feeding larval dispersion. Some important aspects of this process were studied in a circular arena allowing the combined radial post-feeding dispersion from the center of the arena of C. albiceps and C. megacephala larvae. To determine the location of each pupa, the arena was divided in 72 identical sections starting from the center. The distance from the center, the depth and weight of each pupa were evaluated. Statistical tests were done to verify the relation between weight, depth and distance for pupation. From the total an average of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calliphoridae; C. albiceps; C. megacephala; Dispersion; Forensic entomology.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262005000300011

NEW DEPARTMENTAL RECORDS FOR Digitonthophagus Gazella (COLEOPTERA: SCARABAEIDAE) IN COLOMBIA
Provedor de dados: Acta Biológica Colombiana
Autores: ARI NORIEGA,JORGE; MORENO,JULIANA; OTAVO,SAMUEL; CASTAÑO,EDUARDO.
The introduced dung beetle Digitonthophagus Gazella was reported for the Caribbean Region of Colombia in the 90's. During a survey carried out along the Magdalena river, new records of the presence of this species were found in the departments of Boyacá, Caldas, Cundinamarca, Santander and Tolima for the first time.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dung beetle; Invasive species; Dispersion.
Ano: 2012
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2012000100014

VASCULAR EPIPHYTES: THE UGLY DUCKLING OF PHENOLOGICAL STUDIES
Provedor de dados: Acta Biológica Colombiana
Autores: RAMÍREZ-MARTÍNEZ,Adriana; MONDRAGÓN,Demetria; RIVERA-GARCÍA,Raúl.
ABSTRACT The phenology of vascular epiphytes, which account for about 10 % of the world's flowering plants and perform important ecological functions, has been just partially explored. Since phenology is a key tool for the management and conservation of species, the objective of this review was to synthesize the information published so far about the phenology of vascular epiphytes, detect gaps of knowledge, and suggest future lines of investigation to understand the underlying mechanisms. We conducted an online search for articles in Google Scholar and in the ISI Web of Science database from 1800 to 2020, with different combinations of keywords. 107 studies addressing the phenology of different holoepiphyte species were found; 88 % of the studies were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environmental factors; Dispersion; Pollination; Reproductive biology; Seasonal development; Vegetative biology.
Ano: 2021
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2021000200247

Reproductive Biology of Varronia curassavica Jacq. (Boraginaceae)
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: HOELTGEBAUM,MARCIA P.; MONTAGNA,TIAGO; LANDO,ANA PAULA; PUTTKAMMER,CATARINA; ORTH,AFONSO INÁCIO; GUERRA,MIGUEL P.; REIS,MAURÍCIO S. DOS.
ABSTRACT Varronia curassavica, a subshrubby medicinal species associated with restinga in the Atlantic Forest, has been exploited by local people and the pharmaceutical industry. Indeed, restingas have experienced a continuous process of degradation, and thus, with species and ecosystem both at risk, efforts to support conservation actions are required. The present study aimed to evaluate aspects of V. curassavica reproductive biology. To accomplish this, morphological characterization was performed by monitoring flowering events. The availability of nectar and pollen, as well as the frequency and behavior of floral visitors and dispersers, was also evaluated. This species exhibits both heterostyly and protogyny. Anthesis is diurnal, and flowers last less...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dispersion; Heterostyly; Pollination; Floral resources.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100059

Spatial Distribution of Euschistus heros (Hemiptera: Pentatomidae) in Cotton (Gossypium hirsutum Linnaeus)
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: WEBER,ANDERSON C.; DEGRANDE,PAULO E.; SOUZA,ELLEN P. DE; AZAMBUJA,ROSALIA; FERNANDES,MARCOS G.
Abstract Recently, the Neotropical brown stink bug, Euschistus heros (Pentatomidae: Hemiptera), has been detected in cotton in the Brazilian Cerrado. Several reliable surveys have been conducted on the spatial distribution of stink bugs in soybean; however, few studies have examined the behavior of this insect in cotton in Brazil. Thus, this study examined the spatial distribution of E. heros in cotton using aggregation indices based on the variance-to-mean ratio, Morisita index, exponent k, Poisson and negative binomial distributions. Inverse Distance Weighting interpolation maps were also used to represent insect density. The study was conducted in a 1.1 hectare experimental cotton field in which 64 equally-sized plots were sampled on a weekly basis. Our...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aggregation Indices; Dispersion; GIS; IPM; Negative Binomial.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703483

Tetanorhynchus leonardosi (Mello-Leitão) (Orthoptera: Proscopiidae), nova praga em eucaliptos
Provedor de dados: Anais da Sociedade Entomológica do Brasil
Autores: Flechtmann,Carlos A.H.; Ottati,Angelo L.T.
We report for the first time the attack of the walking stick Tetanorhynchus leonardosi (Mello-Leitão) (Orthoptera: Proscopiidae) on young eucalyptus, Eucalyptus urophylla, in Brazil. The upper third of the trees was attacked (apical meristems and new leaves). During the hottest hours of the day the insects were found sheltered between leaves on the median third of the plants, and feeding when temperatures were milder. The attack was heterogeneous in the stand, being more concentrated when it was neighbouring an area of native 'Cerrado' vegetation. Mean defoliation was 5.8%, with an average of 5.2% of plants with apical meristems cut by the walking sticks. An application of Methyl Parathion was not effective against the pest. Apparently plants older than 6...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Damage; Dispersion; Walking stick.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0301-80591997000300027

Frugivory by the White-bearded Manakin (Manacus manacus, Pipridae) in restinga forest, an ecosystem associated to the Atlantic forest
Provedor de dados: Biota Neotropica
Autores: 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

REGISTRO DE LOS MOVIMIENTOS DE DOS EJEMPLARES DE COCODRILO AMERICANO, CROCODYLUS ACUTUS, EN PUERTO VALLARTA, JALISCO, MÉXICO
Provedor de dados: Boletín de Investigaciones Marinas y Costeras (INVEMAR)
Autores: Cupul-Magaña,Fabio Germán.
Animal dispersal is the movement outward from a home area. This brief communication describes the movement of an adult and a juvenile of Crocodylus acutus captured and recaptured in the locality of Puerto Vallarta, Mexico, between 2001 and 2004. Between capture and recapture, the adult crocodile moved 5 km in lapse of 42 days and a juvenile crocodile moved 1.6 km in lapse of three years and five months.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Crocodile; Crocodylia; Crocodylus acutus; Dispersion; Movements.
Ano: 2012
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612012000200013

Colonization of artificial substrata by teredinid larvae released from a previously infested focus at Ilha Grande Bay, RJ
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: 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

Geostatistics applied to the study of the spatial distribution of Tibraca limbativentris in flooded rice fields
Provedor de dados: Ciência Rural
Autores: 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