CIRAD  Publications : Dumont Yves
http://publications.cirad.fr/auteur.php?mat=13731
Liste des publications scientifiques et techniques produites par Yves Dumont
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CIRAD : Publications
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CIRAD
Mon, 09 Dec 2019 01:34:04 +0100

Implementation of control strategies for sterile insect techniques
http://publications.cirad.fr/une_notice.php?dk=593031
Publication NÂ°593031
Thu, 04 Jul 2019 09:00:00 +0100
Bliman P.A., CardonaSalgado D., Dumont Y., Vasilieva O.<br />
2019<br />
<br />
In this paper, we propose a sexstructured entomological model that serves as a basis for design of control strategies relying on releases of sterile male mosquitoes (Aedes spp) and aiming at elimination of the wild vector population in some target locality. We consider different types of releases (constant and periodic impulsive), providing sufficient conditions to reach elimination. However, ...<br /><br />Maladies des animaux; Autres thèmes

Bistable dynamics of a hostpathogen model
http://publications.cirad.fr/une_notice.php?dk=590849
Publication NÂ°590849
Fri, 25 Jan 2019 09:00:00 +0100
Anguelov R., Bekker R., Dumont Y.<br />
2019<br />
<br />
Crop hostpathogen interaction have been a main issue for decades, in particular for food security. In this paper, we focus on the modeling and long term behavior of soilborne pathogens. We first develop a new compartmental temporal model, which exhibits bistable asymptotical dynamics. To investigate the long term behavior, we use LaSalle Invariance Principle to derive sufficient conditions for ...<br /><br />Maladies des plantes; Méthodes mathématiques et statistiques; Biologie du sol

On a threestage structured model for the dynamics of malaria transmission with human treatment, adult vector demographics and one aquatic stage
http://publications.cirad.fr/une_notice.php?dk=590377
Publication NÂ°590377
Tue, 08 Jan 2019 09:00:00 +0100
Ngwa G.A., TebohEwungkem M.I., Dumont Y., Ouifki R., Banasiak J.<br />
2019<br />
<br />
A modelling framework that describes the dynamics of populations of the female Anopheles sp mosquitoes is used to develop and analyse a deterministic ordinary differential equation model for dynamics and transmission of malaria amongst humans and varying mosquito populations. The framework includes a characterization of the gonotrophic cycle of the female mosquito. The epidemiological model also ...<br /><br />Méthodes mathématiques et statistiques; Autres thèmes; Ecologie animale

A tribute to the use of minimalistic spatiallyimplicit models of savanna vegetation dynamics to address broad spatial scales in spite of scarce data
http://publications.cirad.fr/une_notice.php?dk=590193
Publication NÂ°590193
Fri, 21 Dec 2018 09:00:00 +0100
Djeumen V., Tchuinte Tamen A., Dumont Y., Couteron P.<br />
2018<br />
<br />
The savanna biome encompasses a variety of vegetation physiognomies that traduce complex dynamical responses of plants to the rainfall gradients leading from tropical forests to hot deserts. Such responses are shaped by interactions between woody and grassy plants that can be either direct, disturbancemediated or both. There has been increasing evidence that several vegetation physiognomies, ...<br /><br />Méthodes mathématiques et statistiques; Ecologie végétale; Taxonomie végétale et phytogéographie; Foresterie  Considérations générales

On the use of the sterile insect release technique to reduce or eliminate mosquito populations
http://publications.cirad.fr/une_notice.php?dk=589761
Publication NÂ°589761
Fri, 07 Dec 2018 09:00:00 +0100
Strugarek M., Bossin H., Dumont Y.<br />
2019<br />
<br />
Vector control is critical to limit the circulation of vectorborne diseases, like chikungunya, dengue or zika, which have become important issues around the world. Among them, the Sterile Insect Technique (SIT) and the Incompatible Insect Technique (IIT) have recently aroused a renewed interest. In this paper we derive and study a minimalistic mathematical model designed for Aedes mosquito ...<br /><br />Organismes nuisibles des animaux; Maladies des animaux; Autres thèmes; Méthodes mathématiques et statistiques

Models for Miridae, a Cocoa insect pest. Application in control strategies.
http://publications.cirad.fr/une_notice.php?dk=589668
Publication NÂ°589668
Fri, 30 Nov 2018 09:00:00 +0100
Tapi D., BagnyBeilhe L., Bowong S., Dumont Y.<br />
2018<br />
<br />
Cocoa mirid, Sahlbergella singularis, is one of the major pests of cocoa in West Africa. It is responsible of several damages in plots. In this paper, we study the dynamics of this pest. Based on biological and ecological partial knowledge, we develop 2 cooperative mathematical models that aim to describe the time dynamics of the cocoa mirids. We first develop a cooperative stage?structured ...<br /><br />Ravageurs des plantes; Méthodes mathématiques et statistiques

Sexstructured dynamics of mosquitoes involving sterile males
http://publications.cirad.fr/une_notice.php?dk=589360
Publication NÂ°589360
Mon, 26 Nov 2018 09:00:00 +0100
Bliman P.A., CardonaSalgado D., Dumont Y., Vasilieva O.<br />
2018<br />
<br />
In many tropical and subtropical countries, the epidemic outbreaks of vectorborne viral infections such as dengue, chikungunya and zika, are strongly correlated with the presence and abundance of Aedes mosquitoes that act as vector transmitters of these viral diseases. In absence of vaccine, combatting mosquito population still remains the primary method for control of vectorborne diseases. We ...<br /><br />Génétique et amélioration des animaux; Physiologie animale : reproduction; Organismes nuisibles des animaux

Bistable dynamics of a hostpathogen model
http://publications.cirad.fr/une_notice.php?dk=589358
Publication NÂ°589358
Mon, 26 Nov 2018 09:00:00 +0100
Anguelov R., Bekker R., Dumont Y.<br />
2018<br />
<br />
We discuss a model of the spread of a soil pathogen in roots. The model can be considered an extension of the compartmental model of [1] by including compartments for the pathogen. In this way we can consider the spread of the infection through the spatial diffusion of the free (unattached) pathogen, which we believe is a more realistic approach. We show that for the space independent model the ...<br /><br />Maladies des plantes; Biologie du sol

Releases of sterilizing males for mosquito population elimination: New insights from a bistable model
http://publications.cirad.fr/une_notice.php?dk=589359
Publication NÂ°589359
Mon, 26 Nov 2018 09:00:00 +0100
Dumont Y., Strugarek M.<br />
2018<br />
<br />
Motivated by recent field experiments in French Polynesia, we aim at understanding the time dynamics of a mosquito population of genus Aedes exposed to artificial releases of sterilizing males. These males can be either sterilized by irradiation (SIT) or have a sterile crossing with wild females due to incompatible strains of {\it Wolbachia} (IIT). In both cases the released males sterilize the ...<br /><br />Génétique et amélioration des animaux; Physiologie animale : reproduction; Organismes nuisibles des animaux

Modeling the temporal evolution of cocoa black pod rot disease caused by #Phytophthora megakarya#
http://publications.cirad.fr/une_notice.php?dk=588646
Publication NÂ°588646
Tue, 28 Aug 2018 09:00:00 +0100
Nembot Fomba C.G., Takam Soh P., Ten Hoopen G.M., Dumont Y.<br />
2018<br />
<br />
Black pod rot, caused by Phytophthora megakarya, is the main cause of cocoa losses in Cameroon. A few studies have focused on describing black pod epidemics in cocoa yet numerous questions remain. Here, an epidemiological model describing the temporal evolution of cocoa black pod, taking into account the development stages of pods, is developed and studied. In particular, the relative importance ...<br /><br />Maladies des plantes

Modeling oil palm pollinator dynamics using deterministic and agent?based approaches. Applications on fruit set estimates. Some preliminary results
http://publications.cirad.fr/une_notice.php?dk=587653
Publication NÂ°587653
Fri, 20 Apr 2018 09:00:00 +0100
Dumont Y., Soulie J.C., Michel F.<br />
2018<br />
<br />
Oil palm production is of economical importance in several southern countries. The increasing demand of oil palm put a lot of pressure in several places where the rain forest and thus the tropical diversity are in danger due to deforestation. With the land already cultivated, we need to improve the yields, which means to increase the production of fruits in plots. One way is to increase the ...<br /><br />Physiologie végétale : reproduction; Méthodes mathématiques et statistiques

On crop vectorborne diseases. Impact of virus lifespan and contact rate on the travelingwave speed of infective fronts
http://publications.cirad.fr/une_notice.php?dk=586245
Publication NÂ°586245
Mon, 11 Dec 2017 09:00:00 +0100
Chapwanya M., Dumont Y.<br />
2018<br />
<br />
Diseases, in particular, vectorborne diseases are very important issues in crop protection. However, despite their impact on food safety, very few mathematical models have been developed in order to improve control strategies. Motivated by existing literature, we begin by considering a temporal model of vectorborne diseases in (annual) crops. Using appropriate mathematical methods, we show the ...<br /><br />Maladies des plantes; Méthodes mathématiques et statistiques

Spatially explicit modelling of treegrass interactions in fireprone savannas: A partial differential equations framework
http://publications.cirad.fr/une_notice.php?dk=585566
Publication NÂ°585566
Thu, 05 Oct 2017 09:00:00 +0100
Yatat V., Couteron P., Dumont Y.<br />
2018<br />
<br />
Long term tree¿grass dynamics is an important issue in many places around the world. Especially, if we intend to take into account environmental and human perturbations, like fire events, herbivory, etc. In this paper, we complete and extend temporal models developed in recent papers by Yatat et al. (2014, 2017) and Tchuinte Tamen et al. (2014), using diffusion operators, into spatiotemporal ...<br /><br />Foresterie  Considérations générales; Conservation de la nature et ressources foncières; Ecologie végétale; Dégâts causés aux forêts et leur protection; Méthodes mathématiques et statistiques

Mathematical model for pestinsect control using mating disruption and trapping
http://publications.cirad.fr/une_notice.php?dk=585276
Publication NÂ°585276
Wed, 06 Sep 2017 09:00:00 +0100
Anguelov R., Dufourd C., Dumont Y.<br />
2017<br />
<br />
Controlling pest insects is a challenge of main importance to preserve crop production. In the context of Integrated Pest Management (IPM) programs, we develop a generic model to study the impact of mating disruption control using an artificial female pheromone to confuse males and adversely affect their mating opportunities. Consequently the reproduction rate is diminished leading to a decline ...<br /><br />Ravageurs des plantes; Méthodes mathématiques et statistiques

Public mosquito abatement: A cluster randomized experiment
http://publications.cirad.fr/une_notice.php?dk=584397
Publication NÂ°584397
Mon, 10 Jul 2017 09:00:00 +0100
Thuilliez J., Dumont Y.<br />
2019<br />
<br />
Mosquito abatement is a public good. A simultaneous model of mosquito abundance and abatement response is developed. We then use data from a cluster randomized controlled experiment conducted over the period 2012¿2014 in urban areas of Réunion in France to study the impact of WHOrecommended mechanical elimination techniques, which involve removing sources of stagnant water around the house, on a ...<br /><br />Organismes nuisibles des animaux; Maladies des animaux; Autres thèmes

Larval interference competition between the native Neotropical mosquito #Limatus durhamii# and the invasive #Aedes aegypti# improves the fitness of both species
http://publications.cirad.fr/une_notice.php?dk=584396
Publication NÂ°584396
Fri, 19 May 2017 09:00:00 +0100
Talaga S., Déjean A., Mouza C., Dumont Y., Leroy C.<br />
2018<br />
<br />
Interspecific competition with native species during biological invasions can sometimes limit alien expansion. We aimed to determine the potential ecological effects of Limatus durhamii Theobald 1901, a native Neotropical mosquito (Diptera: Culicidae) species, on the invasive species Aedes (Stegomyia) aegypti (Linnaeus 1762) that breeds in the same artificial water containers. Development time ...<br /><br />Organismes nuisibles des animaux; Ecologie animale

Simulations and parameter estimation of a trapinsect model using a finite element approach
http://publications.cirad.fr/une_notice.php?dk=582512
Publication NÂ°582512
Tue, 13 Dec 2016 09:00:00 +0100
Anguelov R., Dufourd C., Dumont Y.<br />
2017<br />
<br />
Estimating pest population size is of utmost importance in biological control. However field experiments can be difficult and expensive to conduct, with no guarantee that useable results will be produced. In this context, the development of mathematical models and numerical tools is crucial to improve the field experiments by suggesting relevant data which can be used to estimate parameters ...<br /><br />Ravageurs des plantes; Méthodes mathématiques et statistiques

A minimalistic model of treegrass interactions using impulsive differential equations and nonlinear feedback functions of grass biomass onto fireinduced tree mortality
http://publications.cirad.fr/une_notice.php?dk=582513
Publication NÂ°582513
Tue, 13 Dec 2016 09:00:00 +0100
Tchuinte Tamen A., Dumont Y., Tewa J.J., Bowong S., Couteron P.<br />
2017<br />
<br />
Since savannas are important ecosystems around the world, their long term dynamics is an important issue, in particular when perturbations, like fires, occur more or less often. In a previous paper, we developed and studied a tree¿grass model that take into account fires as pulse events using impulsive differential equations. In this work, we propose to improve this impulsive model by considering ...<br /><br />Foresterie  Considérations générales; Ecologie végétale

An impulsive modelling framework of fire occurrence in a sizestructured model of tree¿grass interactions for savanna ecosystems
http://publications.cirad.fr/une_notice.php?dk=582331
Publication NÂ°582331
Tue, 29 Nov 2016 09:00:00 +0100
Yatat V., Couteron P., Tewa J.J., Bowong S., Dumont Y.<br />
2017<br />
<br />
Fires and mean annual rainfall are major factors that regulate woody and grassy biomasses in savanna ecosystems. Within the savanna biome, conditions of longlasting coexistence of trees and grasses have been often studied using continuoustime modelling of tree¿grass competition. In these studies, fire is a timecontinuous forcing while the relationship between woody plant size and ...<br /><br />Ecologie végétale; Foresterie  Considérations générales; Méthodes mathématiques et statistiques

Improving insectpest management via mating disruption and trapping models
http://publications.cirad.fr/une_notice.php?dk=581645
Publication NÂ°581645
Mon, 19 Sep 2016 09:00:00 +0100
Anguelov R., Dufourd C., Dumont Y.<br />
2016<br />
<br />
Pests, such as the false codling moth, represent an important threat for food production in South Africa. Reducing the use of pesticides is a major challenge to meet specific export requirements and ensure economically viable crop production. Biological control, or pestspecific devices are often considered as alternatives to massive spraying of pesticides. The success of such methods often ...<br /><br />Ravageurs des plantes; Méthodes mathématiques et statistiques

Interactions of pulsed fires and water in treegrass savanna ecosystems
http://publications.cirad.fr/une_notice.php?dk=581646
Publication NÂ°581646
Mon, 19 Sep 2016 09:00:00 +0100
Tchuinte Tamen A., Dumont Y., Bowong S., Tewa J.J., Couteron P.<br />
2016<br />
<br />
In [1,2], we have developed and compared two variants of a minimalistic treegrass model which account for fire as periodic pulse events using impulsive differential equations (IDEs). Our models explicitly consider both a generic nonlinear increasing function of grass and the response function of woody biomass to fire intensity. In particular, in [2], this fire response function has been choosen ...<br /><br />Conservation de la nature et ressources foncières; Foresterie  Considérations générales; Ecologie végétale; Méthodes mathématiques et statistiques

Human Behaviours: A threat to mosquito control?
http://publications.cirad.fr/une_notice.php?dk=581647
Publication NÂ°581647
Mon, 19 Sep 2016 09:00:00 +0100
Dumont Y., Thuilliez J.<br />
2016<br />
<br />
In this work, we consider a simple theoretical model that enables us to take into account private human decisions that may interfere with public mosquito control. The model reflects the tradeoff between perceived costs and observed efficacy. Our theoretical results emphasize that households may reduce their protective behavior in response to mechanical elimination techniques piloted by a public ...<br /><br />Organismes nuisibles des animaux; Méthodes mathématiques et statistiques

Modelling interactions between plants and bioagressors. Mathematical perspectives
http://publications.cirad.fr/une_notice.php?dk=581583
Publication NÂ°581583
Tue, 13 Sep 2016 09:00:00 +0100
Dumont Y.<br />
2016<br />
<br />
In many countries around the world, and in particular in Southern countries, the food demand is increasing while arable lands are reducing or being more and more impacted by bioagressors (pests and pathogens), due, partly, to climate change. Many farmers cannot use pesticides due to their prohibitive price and because their usage is banned or more and more restricted. Thus, it is crucial to ...<br /><br />Protection des végétaux : considérations générales; Méthodes mathématiques et statistiques; Ravageurs des plantes; Maladies des plantes

Discontinuous Galerkin solver for the unsteady advectionreactiondiffusion equation. Applications to the simulation and parameter identification of a root growth model
http://publications.cirad.fr/une_notice.php?dk=581124
Publication NÂ°581124
Mon, 08 Aug 2016 09:00:00 +0100
Dumont Y., Fourcaud T., Peynaud E.<br />
2016<br />
<br />
Root systems are important for plants but they are difficult to study because of heavy constraints of field experiments. Modelling and simulation of root systems are crucial tools to better understand root systems, but also to design new experiments. Among the various modelling approaches, the density approach consists in following the evolution over time and space of the root biomass density in ...<br /><br />Physiologie végétale : croissance et développement; Méthodes mathématiques et statistiques

Tree¿grass interaction dynamics and pulsed fires: Mathematical and numerical studies
http://publications.cirad.fr/une_notice.php?dk=580464
Publication NÂ°580464
Tue, 17 May 2016 09:00:00 +0100
Tchuinte Tamen A., Dumont Y., Tewa J.J., Bowong S., Couteron P.<br />
2016<br />
<br />
Savannas are dynamical systems where grasses and trees can either dominate or coexist. Fires are known to be central in the functioning of the savanna biome although their characteristics are expected to vary along the rainfall gradients as observed in SubSaharan Africa. In this paper, we model the tree¿grass dynamics using impulsive differential equations that consider fires as discrete events. ...<br /><br />Foresterie  Considérations générales; Ecologie végétale; Méthodes mathématiques et statistiques

Impulsive modelling for treegrass interactions in fireprone savanna
http://publications.cirad.fr/une_notice.php?dk=577589
Publication NÂ°577589
Mon, 05 Oct 2015 09:00:00 +0100
Yatat V., Couteron P., Tewa J.J., Bowong S., Dumont Y.<br />
2015<br />
<br />
The study of treegrass interactions in savanna (fires prone or not) remains an important issue for research. In African savanna, it is well known that fire is a major disturbance that shapes treegrass ratio along a rainfall gradient. Several mathematical models have been developed that addressed fire prone savanna dynamics. Such models rely mostly on continuoustime modelling of treegrass ...<br /><br />Foresterie  Considérations générales; Ecologie végétale; Méthodes mathématiques et statistiques

Maths for plants and plants for maths. Mathematics applied to agronomy and crop protection
http://publications.cirad.fr/une_notice.php?dk=577529
Publication NÂ°577529
Mon, 05 Oct 2015 09:00:00 +0100
Dumont Y.<br />
2015<br />
<br />
Crop Protection, and more generally Food Security, is considered as one of the greatest World challenges in the forthcoming decades. Currently, they are more that 1 billion undernourished people. It has been estimated that up to 40 percent of the world's potential crop production is already lost annually because of the effects of weeds, pests and diseases. This is particularly true in Southern ...<br /><br />Agriculture  Considérations générales; Méthodes mathématiques et statistiques; Protection des végétaux : considérations générales; Ravageurs des plantes

Modelling fires as pulses in tree/grass interactions: study of longterm impact in forestsavanna dynamical systems
http://publications.cirad.fr/une_notice.php?dk=577590
Publication NÂ°577590
Mon, 05 Oct 2015 09:00:00 +0100
Tchuinte Tamen A., Dumont Y., Bowong S., Tewa J.J., Couteron P.<br />
2015<br />
<br />
It is usually admitted that fires play an important role in treegrass interactions in savanna ecosystems. In this talk, we present a model of treegrass dynamics using impulsive differential equations, considering fires as discrete events [1]. This framework allows us to carry out a comprehensive qualitative mathematical analysis that revealed more possible outcomes than the analogous continuous ...<br /><br />Méthodes mathématiques et statistiques; Foresterie  Considérations générales; Ecologie végétale

Population estimate using a trapinsect model
http://publications.cirad.fr/une_notice.php?dk=577588
Publication NÂ°577588
Mon, 05 Oct 2015 09:00:00 +0100
Anguelov R., Dufourd C., Dumont Y.<br />
2015<br />
<br />
In order to develop efficient biological control of pest insects such as mosquitoes or fruit flies, the knowledge of the population size is essential. Typically, the only field data available is obtained using traps and/or markreleaserecapture experiments. Field experiments can be time consuming and costly to conduct, with no guarantee on the usefulness of the data collected for reliable ...<br /><br />Méthodes mathématiques et statistiques; Méthodes de relevé; Ravageurs des plantes

Seasonal variation in size estimates of #Aedes albopictus# population based on standard markreleaserecapture experiments in an urban area on Reunion Island
http://publications.cirad.fr/une_notice.php?dk=575025
Publication NÂ°575025
Thu, 29 Jan 2015 09:00:00 +0100
Gouagna L.C., Dehecq J.S., Fontenille D., Dumont Y., Boyer S.<br />
2015<br />
<br />
The implementation of the sterile insect technique for areawide vector control requires that natural population density be accurately estimated to determine both the appropriate time to treat and the adequate number of sterile males for release. Herein, we used markreleaserecapture (MRR) to derive seasonal abundance estimates of Aedes albopictus population sizes within a delimited geographical ...<br /><br />Organismes nuisibles des animaux; Maladies des animaux; Autres thèmes; Méthodes mathématiques et statistiques; Méthodes de relevé

Dynamic contact of a beam against rigid obstacles: Convergence of a velocitybased approximation and numerical results
http://publications.cirad.fr/une_notice.php?dk=574894
Publication NÂ°574894
Fri, 23 Jan 2015 09:00:00 +0100
Dumont Y., Paoli L.<br />
2015<br />
<br />
Motivated by the study of vibrations due to looseness of joints, we consider the motion of a beam between rigid obstacles. Due to the nonpenetrability condition, the dynamics is described by a hyperbolic fourth order variational inequality. We build a family of fully discretized approximations of this problem by combining some classical space discretizations with velocity based timestepping ...<br /><br />Méthodes mathématiques et statistiques; Technologie des produits forestiers

BIOMATH 2013 [Editorial]
http://publications.cirad.fr/une_notice.php?dk=574242
Publication NÂ°574242
Tue, 04 Nov 2014 09:00:00 +0100
Anguelov R., Dumont Y.<br />
2014<br />
<br />
The interdisciplinary nature of biological sciences and medicine, including the important role mathematical, statistical and computational modeling play in the analysis and interpretation of data and information is well recognized. "A mathematical biology research project is no longer guided by the independent spirit of one or two applied mathematicians working on a biological problem. Modern ...<br /><br />Méthodes mathématiques et statistiques; Méthodes de recherche; Recherche agronomique; Autres thèmes

A generic modeling of fire impact in a treegrass savanna model
http://publications.cirad.fr/une_notice.php?dk=574101
Publication NÂ°574101
Mon, 20 Oct 2014 09:00:00 +0100
Tchuinte Tamen A., Tewa J.J., Couteron P., Bowong S., Dumont Y.<br />
2014<br />
<br />
We propose and study a model for treegrass interactions in the context of savannas which are subjected to fire pressure. Several theoretical models in the literature which have highlighted the impact of fire on treegrass interactions did not explicitly deal with the indirect feedback of dry grass biomass onto tree dynamics through fire intensity and frequency. The novelty in our work is to ...<br /><br />Ecologie végétale; Foresterie  Considérations générales; Méthodes mathématiques et statistiques; Dégâts causés aux forêts et leur protection

Direct and apparent compensation in plantherbivore interactions
http://publications.cirad.fr/une_notice.php?dk=573939
Publication NÂ°573939
Wed, 24 Sep 2014 09:00:00 +0100
Lebon A., Mailleret L., Dumont Y., Grognard F.<br />
2014<br />
<br />
The potential positive effects of herbivores on plants have been the subject of debates for decades. Whiletraditionally, herbivory was considered to have a negative impact on plants, some studies also reportedpossible mutualism between plants and herbivores. Plant defences, and in particular tolerance and resistance, seem to play an important role in shaping plantherbivore interactions. The aim ...<br /><br />Culture des plantes; Ecologie végétale; Méthodes mathématiques et statistiques; Alimentation animale

Editorial of the Special Issue of the 4th International Symposium onPlant Growth Modeling, Simulation, Visualization and Applications(PMA'12)
http://publications.cirad.fr/une_notice.php?dk=573943
Publication NÂ°573943
Wed, 24 Sep 2014 09:00:00 +0100
Fourcaud T., Kang M.Z., Dumont Y., Guo Y.<br />
2014<br />
<br />
Physiologie végétale : croissance et développement; Méthodes mathématiques et statistiques; Culture des plantes

On mathematical modelling of plantinsect interactions
http://publications.cirad.fr/une_notice.php?dk=573781
Publication NÂ°573781
Mon, 01 Sep 2014 09:00:00 +0100
Dumont Y.<br />
2014<br />
<br />
Plants and Insects are studied since decades, but, most of the time, separately. In Agronomy, plants are studied in order to improve crop yields while insects are studied in order to control their (negative or positive) impacts on crop yields. It is well known that plants and insects are always in interaction but, surprisingly, they are very few mathematical models of these interactions. For ...<br /><br />Méthodes mathématiques et statistiques; Ravageurs des plantes; Ecologie animale

Sensitivity analysis of trapmodels for insects
http://publications.cirad.fr/une_notice.php?dk=573780
Publication NÂ°573780
Mon, 01 Sep 2014 09:00:00 +0100
Anguelov R., Dufourd C., Dumont Y.<br />
2014<br />
<br />
In order to control a wild insect population with SIT (Sterile Insect Technique), it is necessary to estimate this population. This can be done with experimental data (using traps), combined with appropriate dispersal models, like those studied in [1, 2]. However the observed trap data depend on some (unknown) population parameters, like the diffusivity, and some (unknown) trap parameters, like ...<br /><br />Méthodes mathématiques et statistiques; Organismes nuisibles des animaux

Predicting the altitudinal distribution of an introduced phytophagous insect against an invasive alien plant from laboratory controlled experiments: case of #Cibdela janthina# (Hymenoptera:Argidae) and #Rubus alceifolius# (Rosaceae) in La Réunion
http://publications.cirad.fr/une_notice.php?dk=573644
Publication NÂ°573644
Fri, 18 Jul 2014 09:00:00 +0100
Mathieu A., Dumont Y., Chiroleu F., Duyck P.F., Flores O., Lebreton G., Reynaud B., Quilici S.<br />
2014<br />
<br />
The sawfly Cibdela janthina (Hymenoptera: Argidae) native to Sumatra was introduced on La Réunion (France, Indian Ocean) in 2007 to control the giant bramble Rubus alceifolius (Rosaceae), one of the most invasive plants on this island. We determined the influence of temperature on the development duration and survival of C. janthina preimaginal stages in controlled conditions in order to ...<br /><br />Mauvaises herbes et désherbage; Méthodes mathématiques et statistiques

Mathematical analysis of a size structured treegrass competition model for savanna ecosystems
http://publications.cirad.fr/une_notice.php?dk=573439
Publication NÂ°573439
Wed, 04 Jun 2014 09:00:00 +0100
Yatat V., Dumont Y., Tewa J.J., Couteron P., Bowong S.<br />
2014<br />
<br />
Several continuoustime treegrass competition models have been developed to study conditions of longlasting coexistence of trees and grass in savanna ecosystems according to environmental parameters such as climate or fire regime. In those models, fire intensity is a fixed parameter while the relationship between woody plant size and firesensitivity is not systematically considered. In this ...<br /><br />Méthodes mathématiques et statistiques; Ecologie végétale

Parameter identification in population models for insects using trap data
http://publications.cirad.fr/une_notice.php?dk=571823
Publication NÂ°571823
Mon, 13 Jan 2014 09:00:00 +0100
Dufourd C., Weldon C., Anguelov R., Dumont Y.<br />
2013<br />
<br />
raps are used commonly to establish the presence and population density of pest insects. Deriving estimates of population density from trap data typically requires knowledge of the properties of the trap (e.g. active area, strength of attraction) as well as some properties of the population (e.g. diffusion rate). These parameters are seldom exactly known, and also tend to vary in time, (e.g. as a ...<br /><br />Méthodes mathématiques et statistiques; Ravageurs des plantes; Méthodes de relevé

Impact of environmental factors on mosquito dispersal in the prospect of sterile insect technique control
http://publications.cirad.fr/une_notice.php?dk=570747
Publication NÂ°570747
Thu, 10 Oct 2013 09:00:00 +0100
Dufourd C., Dumont Y.<br />
2013<br />
<br />
The aim of this paper is to develop a mathematical model to simulate mosquito dispersal and its control taking into account environmental parameters, like wind, temperature, or landscape elements. We particularly focus on the Aedes albopictus mosquito which is now recognized as a major vector of human arboviruses, like chikungunya, dengue, or yellow fever. One way to prevent those epidemics is to ...<br /><br />Organismes nuisibles des animaux; Méthodes mathématiques et statistiques; Maladies des animaux

A patchy model for Chikungunyalike diseases
http://publications.cirad.fr/une_notice.php?dk=570326
Publication NÂ°570326
Wed, 11 Sep 2013 09:00:00 +0100
Bowong S., Dumont Y., Tewa J.J.<br />
2013<br />
<br />
We consider a npatches model, to study the impact of human population movements between cities (patches) in the spread of Chikungunya or even Dengue diseases. In previous works, it was showed that the basic reproduction number can vary from place to place, but this result was obtained without taking into account human movements. We provide a theoretical study of the patchy model, and derive the ...<br /><br />Maladies des animaux; Méthodes mathématiques et statistiques; Autres thèmes

Dynamically consistent nonstandard finite difference schemes for epidemiological models
http://publications.cirad.fr/une_notice.php?dk=569397
Publication NÂ°569397
Mon, 10 Jun 2013 09:00:00 +0100
Anguelov R., Dumont Y., Lubuma J., Shillor M.<br />
2014<br />
<br />
This work is the numerical analysis and computational companion of the paper by Kamgang and Sallet [J.C. Kamgang, G. Sallet, Computation of threshold conditions for epidemiological models and global stability of the disease free equilibrium (DFE), Mathematical Biosciences 213 (2008) 112] where threshold conditions for epidemiological models and the global stability of the diseasefree ...<br /><br />Méthodes mathématiques et statistiques; Maladies des animaux

Stability analysis and dynamics preserving nonstandard finite difference schemes for a malaria model
http://publications.cirad.fr/une_notice.php?dk=568919
Publication NÂ°568919
Tue, 07 May 2013 09:00:00 +0100
Anguelov R., Dumont Y., Lubuma J., Mureithi E.<br />
2013<br />
<br />
When both human and mosquito populations vary, forward bifurcation occurs if the basic reproduction number R0 is less than one in the absence of diseaseinduced death. When the diseaseinduced death rate is large enough, R0¼1 is a subcritical backward bifurcation point. The domain for the study of the dynamics is reduced to a compact and feasible region, where the system admits a specific ...<br /><br />Méthodes mathématiques et statistiques; Maladies des animaux; Organismes nuisibles des animaux; Autres thèmes

Modeling and simulations of mosquito dispersal. The case of #Aedes albopictus#
http://publications.cirad.fr/une_notice.php?dk=567243
Publication NÂ°567243
Mon, 04 Feb 2013 09:00:00 +0100
Dufourd C., Dumont Y.<br />
2012<br />
<br />
To prevent epidemics of mosquitotransmitted diseases like Chikungunya in R´eunion Island, we develop tools to control its principal vector, Aedes albopictus. Biological control tools, like the Sterile Insect Technique (SIT), are of great interest as an alternative to chemical control tools which are very detrimental to environment. The success of SIT is based on a good knowledge of the biology ...<br /><br />Organismes nuisibles des animaux; Maladies des animaux; Méthodes mathématiques et statistiques

Analysis and simulations of a nonlinear elastic dynamic beam
http://publications.cirad.fr/une_notice.php?dk=567100
Publication NÂ°567100
Fri, 25 Jan 2013 09:00:00 +0100
Andrews K.T., Dumont Y., M'Bengue M.F., Purcell J., Shillor M.<br />
2012<br />
<br />
A model for the dynamics of a Gao elastic nonlinear beam, which is subject to a horizontal traction at one end, is studied. In particular, the buckling behavior of the beam is investigated. Existence and uniqueness of the local weak solution is established using truncation, approximations, a priori estimates, and results for evolution problems. An explicit finite differences numerical algorithm ...<br /><br />Méthodes mathématiques et statistiques; Autres thèmes

Plant growth modeling, simulation, visualization and applications. Proceedings PMA12 : The Fourth International Symposium on Plant Growth Modeling, Simulation, Visualization and Applications, Shanghai, China, 31 October3 November 2012
http://publications.cirad.fr/une_notice.php?dk=566167
Publication NÂ°566167
Wed, 07 Nov 2012 09:00:00 +0100
Kang M.Z. (ed.), Dumont Y. (ed.), Guo Y. (ed.)<br />
2012<br />
<br />
The PMA symposium series was initiated in 2003 by LIAMA, the SinoFrench Laboratory for Computer Sciences, Automation and Applied Mathematics. PMA multidisciplinary events are addressed to plant biologists, mathematicians and computer scientists with an interest in plant growth modeling, simulation, visualization and their applications in plant and crop sciences, forestry, agriculture, ...<br /><br />Méthodes mathématiques et statistiques; Physiologie végétale : croissance et développement; Anatomie et morphologie des plantes; Foresterie  Considérations générales; Culture des plantes

Mathematical studies on the sterile insect technique for the Chikungunya disease and #Aedes albopictus#
http://publications.cirad.fr/une_notice.php?dk=565954
Publication NÂ°565954
Mon, 22 Oct 2012 09:00:00 +0100
Dumont Y., Tchuenche J.M.<br />
2012<br />
<br />
Chikungunya is an arthropodborne disease caused by the Asian tiger mosquito, Aedes albopictus. It can be an important burden to public health and a great cause of morbidity and, sometimes, mortality. Understanding if and when disease control measures should be taken is key to curtail its spread. Dumont and Chiroleu (Math Biosc Eng 7(2):315348, 2010) showed that the use of chemical control tools ...<br /><br />Organismes nuisibles des animaux; Méthodes mathématiques et statistiques; Maladies des animaux; Autres thèmes

Mathematical modeling of sterile insect technology for control of #Anopheles# mosquito
http://publications.cirad.fr/une_notice.php?dk=564866
Publication NÂ°564866
Mon, 23 Jul 2012 09:00:00 +0100
Anguelov R., Dumont Y., Lubuma J.<br />
2012<br />
<br />
The Sterile Insect Technology (SIT) is a nonpolluting method of control of the invading insects that transmit disease. The method relies on the release of sterile or treated males in order to reduce the wild population of anopheles mosquito. We propose two mathematical models. The first model governs the dynamics of the anopheles mosquito. The second model, the SIT model, deals with the ...<br /><br />Maladies des animaux

Numerical methods for the biomechanics of growing trees
http://publications.cirad.fr/une_notice.php?dk=564798
Publication NÂ°564798
Wed, 11 Jul 2012 09:00:00 +0100
Guillon T., Dumont Y., Fourcaud T.<br />
2012<br />
<br />
Modelling the biomechanics of growing trees is a nonclassical problem, as the usual framework of structural mechanics does not take into account the evolution of the domain geometry due to growth processes. Incremental approaches have been used in rod theory to bypass this problem and to model the addition of new material points on an existing deformed structure. However, these approaches are ...<br /><br />Physiologie végétale : croissance et développement; Méthodes mathématiques et statistiques