Factors and mechanisms affecting spatial heterogeneity of insect populations

Vinatier Fabrice, Tixier Philippe, Duyck Pierre François, Lescourret Françoise. 2011. Factors and mechanisms affecting spatial heterogeneity of insect populations. In : Workshop "Towards a Multi-Scale approach for Improving Pest Management", Montpellier, October 4-5, 2011 : résumés = Atelier "Quels outils pour un changement d'échelle dans la gestion des insectes d'intérêt économique?" Montpellier, 4-5 octobre 2011 : résumés. CIRAD. Montpellier : CIRAD, Résumé, 9. Workshop "Towards a Multi-Scale approach for Improving Pest Management", Montpellier, France, 4 Octobre 2011/5 Octobre 2011.

Résumé : 1. The spatial distribution of populations is affected by the dispersal abilities of the species, interactions among individuals, or habitat selection. Linking these ecological processes to spatial patterns is of primary importance for understanding and prediction purposes. 2. We review both statistical and mechanistic methods for studying the spatial distribution of populations. Statistical methods, such as spatial indexes and nearest-neighbour analyses help characterizing the spatial pattern. They allow testing the effect of environmental variables on spatial patterns using regression analyses. 3. Mechanistic modelling can be used to analyse the effect of mechanisms underlying the spatial pattern. We review mechanistic models (e.g. metapopulation, individual-based and cellular automaton models) devoted to represent dispersal abilities, interactions among individuals and habitat selection. 4. We illustrate each method by works on insects, which cover a broad range of spatial patterns. Strengths and limitations of methods are discussed according to the process and type of data set. 5. Scientists can use statistical or mechanistic methods in an iterative manner to infer process from spatial pattern. New approaches such as "pattern-oriented modelling? or "space as a surrogate framework? determine whether alternative models reproduce an observed pattern. It allows selection of the process that best explain the observed pattern. (Texte intégral)

Mots-clés Agrovoc : Insecta, dynamique des populations, modèle

Classification Agris : L20 - Écologie animale
H10 - Ravageurs des plantes
U10 - Informatique, mathématiques et statistiques

Auteurs et affiliations

• Vinatier Fabrice, INRA (FRA)
• Tixier Philippe, CIRAD-PERSYST-UPR Systèmes de culture bananes et ananas (MTQ) ORCID: 0000-0001-5147-9777
• Duyck Pierre François, CIRAD-PERSYST-UPR Systèmes de culture bananes et ananas (MTQ) ORCID: 0000-0001-5484-1970
• Lescourret Françoise, INRA (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/562029/)

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