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Registros recuperados: 23
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A multidisciplinary modelling approach to understand the effects of landscape dynamics on biodiversity Inra
Gaucherel, C.; Martinet, V.; Inchausti, P.; Schaller, N.; Bamière, L.; Sheeren, D.; Gibon, A.; Joannon, A.; CASTELLAZZI, M.; Boussard, H.; Barraquand, F.; Lazrak, E.G.; Mari, J.F.; Houet, T.; Bretagnolle, V..
Over the last 40 years, agricultural extension and intensification of land use have induced profound changes in distribution and dynamics of farmland biodiversity and in the functioning of European agroecosystems. Agroecosystems are mainly private properties, whose dynamics need to be better understood in order to preserve their biodiversity. Several French research teams have recently joined their skills in a multi-disciplinary project, BiodivAgriM, whose main goal is to test, validate, and predict the consequences of different scenarii of landscape changes on the distribution, abundance and persistence of biodiversity in agroecosystems. A central goal of this project is to generate a multi-purpose modelling platform which makes it possible to couple...
Tipo: Conference Paper Palavras-chave: INTEGRATED MODEL; AGRICULTURAL LANDSCAPE; POPULATION DYNAMICS; LAND COVER; LAND USE; BIODIVERSITY LOSS; FARMER DECISION.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010b908463e&uri=/notices/prodinra1/2011/03/
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Decline of the Chesapeake Bay oyster population : a century of habitat destruction and overfishing ArchiMer
Rothschild, Bj; Ault, Js; Goulletquer, Philippe; Heral, Maurice.
The oyster population in the Maryland portion ot Chesapeake Bay, USA, has declined by more than 50-Iold since the early part of this century. The paper presents evidence that the mechanical destruction of habitat and stock over fishing have been important factors in the decline, even thouqh it is commonly thought that 'water quality' and, more recently, oyster diseases are critical. Quantitative analyses show that the long-term decline 01 oysters largely resuIts from habitat loss associated with intense fishing pressure early in this century and stock over fishing from early in the century throuqh recent limes. Furthermore, the major ecological effects on Chesapeake Bay occurred weIl betore World War II, before industrialization and the reported prevalence...
Tipo: Text Palavras-chave: OYSTERS; POPULATION DYNAMICS; OVERFISHING.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/1994/publication-3080.pdf
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Dispersal polymorphism in an invasive forest pest affects its ability to establish Inra
Robinet, C.; Liebhold, A..
Given the increasing number of biological invasions, there is a crucial need toidentify life history traits that promote invasion. Invasiveness reflects capabilities for both establishment after introduction and spread following establishment. In this paper, we explore, via simulation, the interacting effects of dispersal and Allee effects on both invasion processes. Dispersal capability is a trait that has been widely recognized to facilitate invasions. However, dispersal dilutes local population densities in isolated populations and this could strengthen Allee effects, ultimately promoting extinction of invading populations. A spatiallyexplicit, stochastic individual-based model was used to simulate dispersal, mating, and growth in isolated, newly...
Tipo: Journal Article Palavras-chave: BOMBYX DISPARATE; LYMANTRIA DISPAR; EFFET ALLEE; INVASION BIOLOGIQUE; DISPERSION; MODELE STOCHASTIQUE; CYCLE DE DEVELOPPEMENT GYPSY MOTH; PEST INSECT; BIOLOGICAL INVASION; ALLET EFFECT; DISPERSAL; MATING SUCCESS; STOCHASTIC MODEL; LIFE CYCLE; POPULATION DYNAMICS.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20097f9c7f4a&uri=/notices/prodinra1/2010/09/
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Dispersal strategies of phytophagous insects at a local scale: adaptive potential of aphids in an agricultural environment Inra
Lombaert, E.; Boll, R.; Lapchin, L..
Background: The spread of agriculture greatly modified the selective pressures exerted by plants on phytophagous insects, by providing these insects with a high-level resource, structured in time and space. The life history, behavioural and physiological traits of some insect species may have evolved in response to these changes, allowing them to crowd on crops and to become agricultural pests. Dispersal, which is one of these traits, is a key concept in evolutionary biology but has been over-simplified in most theoretical studies. We evaluated the impact of the local-scale dispersal strategy of phytophagous insects on their fitness, using an individual-based model to simulate population dynamics and dispersal between leaves and plants, by walking and...
Tipo: Journal Article Palavras-chave: APHIDS; PHYTOPHAGOUS; POPULATION DYNAMICS; DISPERSAL STRATEGY; MODEL; PLANT CHARACTERISTICS; EVOLUTION.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007b56bf41e&uri=/notices/prodinra1/2009/10/
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Dispersion in time and space affect mating success and Allee effects in invading gypsy moth populations Inra
Robinet, C.; Lance, D.R.; Thorpe, K.W.; Onufrieva, K.S.; Tobin, P.C.; Liebhold, A.M..
1.Understanding why invading populations sometimes fail to establish is of considerable relevance to the development of strategies for managing biological invasions.2.Newly arriving populations tend to be sparse and are often influenced by Allee effects. Mating failure is a typical cause of Allee effects in low-density insect populations, and dispersion of individuals in space and time can exacerbate mate-location failure in invading populations.3. Here we evaluate the relative importance of dispersal and sexual asynchrony as contributors to Allee effects in invading populations by adopting as a case study the gypsy moth (Lymantria dispar L.), an important insect defoliator for which considerable demographic information is available.4. We used...
Tipo: Journal Article Palavras-chave: BOMBYX DISPARATE; LYMANTRIA DISPAR ; INSECTE DEFOLIATEUR; INVASION BIOLOGIQUE; DISPERSION; EFFET ALLEE; PROTANDRIE; MODELE STOCHASTIQUE; DENSITE DE LA POPULATION GYPSY MOTH ; PEST INSECT; DEFOLIATOR INSECT; ALLEE EFFECT; BIOLOGICAL INVASION; POPULATION DYNAMICS; PROTANDRY; STOCHASTIC MODEL; SPATIAL MODELISATION; POPULATION DENSITY.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009b10ebf8&uri=/notices/prodinra1/2010/07/
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Effect of cropping systems on species dynamics and gene flow at the landscape level. A modelling approach Inra
Colbach, N..
Tipo: Conference Paper Palavras-chave: CROPPING SYSTEM; GENE FLOW; GMO; LANDSCAPE; MODEL; POPULATION DYNAMICS.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200868dc4e79&uri=/notices/prodinra1/2011/06/
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Effect on persistence of intra-specific competition in competition models Inra
Lobry, C.; Mazenc, F..
An ecological model describing the competition for a single sub-strate of an arbitrary number of species is considered. The mortality rates of the species are not supposed to have all the same value and the growth function of the substrate is not supposed to be linear or decreasing. Intra-specific competion is taken into account. Under additional technical assumptions, we establish that the model admits a globally asymptotically stable positive equilibrium point. This ensures persistence of the species. Our proof relies on a Lyapunov function.
Tipo: Journal Article Palavras-chave: COEXITENCE DES ESPECES; COMPETITION; FONCTION LYAPUNOV; SURVIE DES ESPECES SPECIES COEXISTENCE; ECOLOGY; POPULATION DYNAMICS;  .
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20107fe8a70e&uri=/notices/prodinra1/2011/01/
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Effects of drought and heat on forest insect populations in relation to the 2003 drought in western Europe Inra
Rouault, G.; Candau, J.N.; Lieutier, F.; Nageleisen, L.M.; Martin, J.C.; Warzée, N..
Bien que la sécheresse affecte directement la physiologie et la croissance des arbres, l'impact de facteurs secondaires (insectes ravageurs, pathogènes et feu) est souvent plus important que le stress original et peut conduire à la mortalité des arbres. En 2003, une sécheresse et des vagues de chaleur ont provoqué des dégâts importants dans les forêts d'Europe centrale et occidentale. Cet article rend compte de l'impact de la sécheresse et de la canicule sur les populations d'insectes forestiers dans le contexte de cet évènement exceptionnel. Les observations des fluctuations de populations des principaux insectes ravageurs des forêts européennes sont présentées et discutées en regard des connaissances actuelles et des théories des interactions entre...
Tipo: Journal Article Palavras-chave: INSECTE XYLOPHAGE; INSECTE PHYLLOPHAGE; PROPRIETE HYDRIQUE DU SOL CLIMATE CHANGE; DROUGHT; HEAT WAVE; FOREST PEST INSECT; POPULATION DYNAMICS.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007562cb6b0&uri=/notices/prodinra1/2009/11/
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Geographic variation in North American gypsy moth cycles: subharmonics, generalist predators, and spatial coupling Inra
Bjørnstad, O.; Robinet, C.; Liebhold, A.M..
Many defoliating forest lepidopterans cause predictable periodic deforestation. Several of these species exhibit geographical variation in both the strength of periodic behavior and the frequency of cycles. The mathematical models used to describe the population dynamics of such species commonly predict that gradual variation in the underlying ecological mechanisms may lead to punctuated (subharmonic) variation in outbreak cycles through period-doubling cascades. Gypsy moth, Lymantria dispar, in its recently established range in the northeastern United States may represent an unusually clear natural manifestation of thisphenomenon. In this study we introduce a new statistical spatial-smoothing method forestimating outbreak periodicity from space–time...
Tipo: Journal Article Palavras-chave: LYMANTRIA DISPAR; BOMBYX DISPARATE; INSECTE DEFOLIATEUR; PULLULATION; CYCLE DE DEVELOPPEMENT; SYNCHRONIE; EFFET ALLEE ; DYNAMIQUE SPATIO-TEMPORELLE; VARIATION GEOGRAPHIQUE GYPSY MOTH; DEFOLIATOR INSECT; PREDATOR; OUTBREAK; POPULATION DYNAMICS; SPATIO-TEMPORAL DYNAMICS; SYNCHRONY; ALLEE EFFECT; GEOGRAPHICAL VARIATION; LIFE CYCLE; NORD AMERICA.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010fe1d0c1c&uri=/notices/prodinra1/2010/08/
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Human-mediated long-distance jumps of the pine processionary moth in Europe Inra
Robinet, C.; Imbert, C.E.; Rousselet, J.; Sauvard, D.; Garcia, J.; Goussard, F.; Roques, A..
Although climate change is currently affecting the distribution of many species, insects are particularly impacted because of their high sensitivity to temperature. The pine processionary moth, Thaumetopoea pityocampa, is a forest insect extending its distribution in response to climate warming. Some pioneer colonies were recently detected far beyond the main range, near Paris and in eastern France. This study tracked the origin and pathways of these pioneer colonies through a combined use of genetic markers, measurement of female flight capabilities, and comparative analyses of the natural enemy complexes. This study also aimed to determine the establishment capability beyond the main range, considering the survival rate during two recent cold periods....
Tipo: Journal Article Palavras-chave: THAUMETOPOEA PITYOCAMPA; LEPIDOPTERA; PROCESSIONNAIRE DU PIN; INSECTE RAVAGEUR; INVASION BIOLOGIQUE; DISPERSION; AIRE DE REPARTITION; RECHAUFFEMENT CLIMATIQUE; ACTIVITE HUMAINE; MARQUEUR GENETIQUE; VOL PINE PROCESSIONARY MOTH; PEST INSECT; CLIMATIC CHANGE; WARMING CLIMATE; BIOLOGICAL INVASION; RANGE EXPANSION; DISTRIBUTION RANGE; HUMAIN ACTIVITY; GENETIC MARKER; POPULATION DYNAMICS; POPULATION BIOLOGY; FLIGHT; FEMALE.
Ano: 2011 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011220ccd2&uri=/notices/prodinra1/2011/05/
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Identifiabilité de paramètres pour des systèmes décrits par des équations aux dérivées partielles. Application à la dynamique des populations Inra
Perasso, A..
L’objectif de cette thèse est d’effectuer une étude d’identifiabilité d’un modèle épidémiologique décrit par un système d’équations aux dérivées partielles (EDP) intégro-différentiel semi-linéaire de type réaction-transport.Dans ce but, nous effectuons tout d’abord une synthèse de la littérature relative aux problèmes inverses d’identifiabilité paramétrique. Nous étudions les fondements mathématiques des différentes techniques employées, en mettant en avant les natures des systèmes auxquels ces méthodes s’appliquent ou se généralisent. En dimension finie, trois méthodes se dégagent pour les systèmes d’équations différentielles ordinaires : par développement en série de Taylor, par élimination algébro-différentielle et par le biais du théorème de l’isomorphisme...
Tipo: Thesis Palavras-chave: PROBLEME INVERSE; IDENTIFIABILITE; EDP; DYNAMIQUE DES POPULATIONS; EPIDEMIOLOGIE INVERSE PROBLEM; IDENTIFIABILITY; PDE; POPULATION DYNAMICS; EPIDEMIOLOGY.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20105b7eca03&uri=/notices/prodinra1/2010/08/
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Impact du changement climatique sur les populations d’insectes forestiers Inra
Roques, A.; Robinet, C..
Les effets du changement climatique sur les insectes forestiers peuvent être directs, en affectant leur physiologie (mortalité, cycle et vitesse de développement, …), indirects en agissant sur les plantes- hôtes (phénologie, modification d’aire, stress hydrique, …), et/ou encore affecter les interactions entre l'espèce considérée et ses compétiteurs et ennemis naturels au sein des communautés animales. La majorité des études ont concerné l’influence de l’augmentation moyenne de la température, qui constitue un facteur décisif pour la survie et le taux d’accroissement des populations d’insectes. Cependant, d’autres variables telles que précipitations,humidité relative, durée d’insolation, ou concentration en CO2, sont à considérer car elles influent...
Tipo: Meeting Paper Palavras-chave: THAUMETOPOEA PITYOCAMPA; PROCESSIONNAIRE DU PIN; RECHAUFFEMENT CLIMATIQUE PINE PROCESSIONARY MOTH; FOREST TREE; PEST INSECT; CLIMATE CHANGE; GLOBAL WARMING; SPATIAL DISTRIBUTION; POPULATION DYNAMICS; RANGE EXPANSION; PHENOLOGY .
Ano: 2005 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009c3318ec8&uri=/notices/prodinra1/2010/05/
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Infering population history with DIYABC: a user-friendly approach to Approximate Bayesian Computation Inra
Cornuet, J.M.; Santos, F.; Beaumont, M.A.; Robert, C.P.; Marin, J.M.; Balding, D.J.; Guillemaud, T.; Estoup, A..
Genetic data obtained on population samples convey information about their evolutionary history. Inference methods can extract this information (at least partially) but they require sophisticated statistical techniques that have been made available to the biologist community (through computer programs) only for simple and standard situations typically involving a small number of samples. We propose here a computer program (DIYABC) for inference based on Approximate Bayesian Computation (ABC), in which scenarios can be customized by the user to fit many complex situations involving any number of populations and samples. Such scenarios involve any combination of population divergences, admixtures and stepwise population size changes. DIYABC can be used to...
Tipo: Journal Article Palavras-chave: INFERENCE; HISTORY; POPULATION DYNAMICS; POPULATION GENETICS; STATISTICS; MATHEMATICAL PROGRAMMING.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009bea71fa3&uri=/notices/prodinra1/2011/04/
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La agricultura capitalista entre el campo y la ciudad : estudio de dos casos en la regi??n pampeana argentina (Tema central) Buscador Latinoamericano
Bober, Gabriel Iv??n; Neiman, Melina.
Este art??culo analiza las transformaciones ocurridas en la producci??n agropecuaria, la estructura agraria y las din??micas poblacionales en el marco de la expansi??n econ??mica protagonizada por la regi??n pampeana argentina en las ??ltimas d??cadas. La rentabilidad de los cultivos, los nuevos paquetes tecnol??gicos disponibles y las din??micas propias de los territorios locales generaron cambios y nuevas relaciones entre lo rural y lo urbano. El estudio se realiza a trav??s de la comparaci??n de dos casos diferenciados, uno exponente de los procesos de ???sojizaci??n??? en la regi??n pampeana y otro expuesto a las din??micas diversificadas del sector agropecuario y a la expansi??n urbana.
Tipo: Art??culo Palavras-chave: AGRICULTURA CAPITALISTA; REGI??N PAMPEANA ARGENTINA; ESTRUCTURA AGRARIA; DIN??MICA POBLACIONAL; USO DEL SUELO; CAPITALIST AGRICULTURE; ARGENTINEAN PAMPAS REGION; AGRARIAN STRUCTURE; POPULATION DYNAMICS; LAND USE.
Ano: 2012 URL: http://hdl.handle.net/10469/5486
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Monitoring the Population Dynamics of the Horse Chestnut Leafminer Cameraria ohridella with a Synthetic Pheromone in Europe Inra
Kindl, J.; Kalinova, B.; Freise, F.; Heitland, W.; Augustin, S.; Guichard, S.; Avtzis, N.; Svatos, A..
A monitoring system for Cameraria ohridella males based on a synthetic sex pheromone was tested in the Czech Republic,Germany, France and Greece. From the obtained data on the insect phenology we concluded that in Central Europe C. ohridella typically has three generations per year. The pheromone monitoring can be used to detect the pest when it appears in uninfested areas and is also suitable to determine population densities.
Tipo: Journal Article Palavras-chave: PIEGE SEXUEL; REPRODUCTION; DENSITE DE POPULATION; INSECTE DEFOLIATEUR HORSE CHESTNUT LEAFMINER ; SEX PHEROMONE TRAP; MONITORING; PHENOLOGY; POPULATION DENSITY; POPULATION DYNAMICS; DEFOLIATING INSECT.
Ano: 2002 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007dfe29fa9&uri=/notices/prodinra1/2009/03/
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Nuevas din??micas urbano - rurales en Bogot?? y Soacha (Tema central) Buscador Latinoamericano
Carvajal S??nchez, Nohora In??s.
Este art??culo examina las recientes din??micas urbano-rurales presentes en Bogot?? y Soacha. Nuevas categor??as de an??lisis surgen para comprender las transformaciones contempor??neas tanto del medio urbano como del rural. En este art??culo, la autora presenta una discusi??n conceptual acerca de los procesos de metropolizaci??n m??s recientes. Al tiempo que se revisan estas perspectivas te??ricas, la autora presenta un an??lisis comparativo que muestra los cambios significativos tanto de las zonas urbanas como rurales en la b??squeda de la comprensi??n integral de las interrelaciones entre el campo y la ciudad.
Tipo: Art??culo Palavras-chave: BOGOT??; SOACHA; COLOMBIA; DIN??MICA POBLACIONAL; ESPACIOS URBANOS; ESPACIOS RURALES; POPULATION DYNAMICS; URBAN SPACES; RURAL AREAS.
Ano: 2012 URL: http://hdl.handle.net/10469/5487
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Patchy patterns due to group dispersal Inra
Soubeyrand, S.; Roques, L.; Coville, J.; Fayard, J..
The presence of multiple foci in population patterns may be due to various processes arising in the population dynamics. Group dispersal, which has been lightly investigated for airborne species, is one of these processes.We built a stochastic model generating the dispersal of groups of particles. This model may be viewed as an extension of classical dispersal models based on parametric kernels. It has a hierarchical structure: at the first stage group centers are drawn under a classical dispersal kernel; at the second stage the particles are diffused around their group centers. Analytic and simulation results show that group dispersal is a sufficient condition to generate patterns with multiple foci, i.e. patchy patterns, even if the population can remain...
Tipo: Journal Article Palavras-chave: MODELE STOCHASTIQUE; DISPERSION GROUPEE; FLUX DE SPORES BROWNIAN MOTION; DISPERSAL KERNEL; MULTIPLE FOCI; POPULATION DYNAMICS; POPULATION PATTERN.
Ano: 2011 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011e19b1112&uri=/notices/prodinra1/2011/06/
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Pattern of invasion by Cameraria ohridella in France: a comparison with Germany Inra
Augustin, S.; Guichard, S.; Gilbert, M.; IOCB, Institute of Organic Chemistry and Biochemistry of the ASCR, Department of Natural Products (CZE).
Although it is likely that the horse chestnut leaf miner Cameraria ohridella (Lepidoptera: Gracillaridae)entered France in the course of 1998, its first observation was recorded near Paris in 2000. The rapid spread of the leafminer throughout Europe suggested that the country would be quickly invaded, and surveys were carried out in 2001, 2002 and 2003 to follow its nationwide spread. Surveys aiming at detecting the presence of the pest by visual observation of leaf damages were carried out in late summer/early autumn in the centre and East of the country in 2001, whereas they were extended to the West in 2002 and 2003. The pattern of spread derived from the spatial analysis of these data is compared to the pattern of spread already described for Germany...
Tipo: Conference Paper Palavras-chave: MINEUSE DU MARRONNIER; LEPIDOPTERE; DISPERSION; DENSITE DE POPULATION; INVASION BIOLOGIQUE; OBSERVATION HORSE CHESTNUT LEAFMINER; DISPERSAL; POPULATION DENSITY; BIOLOGICAL INVASION; POPULATION DYNAMICS; SPATIAL ANALYSIS.
Ano: 2004 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007c4fee13&uri=/notices/prodinra1/2009/03/
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Practical coexistence in the chemostat with arbitrarily close growth functions Inra
Rapaport, A.; Dochain, D.; Harmand, J..
Nous montrons que la coexistence entre différentes espèces en compétition sur une même ressource peut durer sensiblement, lorsque leurs courbes de croissance sont arbitrairement proches. Le comportement transitoire est analysé en termes de dynamiques lente-rapide. Nous prouvons que des espèces non dominantes peuvent d’abord croître avant de décrroître, en fonction de leurs proportions initiales.
Tipo: Journal Article Palavras-chave: COEXISTENCE DES ESPECES; SURVIE DES ESPECES; CHEMOSTAT; COMPETITION; PERSISTANCE; DYNAMIQUES LENTE-RAPIDE SPECIES COEXISTENCE; POPULATION DYNAMICS; SURVIVAL OF SPECIES; PERSISTENCE; SLOW-FAST DYNAMICS.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009a443254d&uri=/notices/prodinra1/2010/12/
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Spatial dynamics of gypsy moth outbreaks in North America Inra
Liebhold, A.; Björnstad, O.; Johnson, D.; Haynes, K.; Robinet, C..
Tipo: Meeting Paper Palavras-chave: LYMANTRIA DISPAR; BOMBYX DISPARATE; INSECTE DEFOLIATEUR; PULLULATION; SYNCHRONIE SPATIALE; PERIODICITE; EFFET MORAN GYPSY MOTH; PEST INSECT; DEFOLIATING INSECT; OUTBREAK; POPULATION DYNAMICS; MORAN EFFECT; SPATIAL SYNCHRONY; PERIODICITY.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009d9d089d5&uri=/notices/prodinra1/2010/09/
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