Factors and mechanisms affecting spatial heterogeneity of insect populations

Fabrice Vinatier 1, * Philippe Tixier 1 Pierre-Rançois Duyck 1 Françoise Lescourret 2
* Corresponding author
1 UPR 26 Systèmes bananes et ananas - Systèmes de Culture Bananes, Ananas, et Plantains
2 PSH - Unité de recherche Plantes et Systèmes de Culture Horticoles
Abstract : 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.
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Conference papers
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Submitted on : Monday, November 28, 2011 - 2:39:10 PM
Last modification on : Friday, July 19, 2019 - 9:08:02 AM

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Fabrice Vinatier, Philippe Tixier, Pierre-Rançois Duyck, Françoise Lescourret. Factors and mechanisms affecting spatial heterogeneity of insect populations. Towards a multi-scale approach for improving pest management. Methods for tracking movement and dispersal of insect pest individuals and populations, Oct 2011, Montpellier, France. ⟨cirad-00645692⟩

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