------------------------------------------------------ URA 2055 ----------------
 Author(s) :
             THlOULOUSE J.
             Space-Time Structure in a Winter Rape Pest Population, Psylliodes
             chrysocephala (Col. chrysomelidae): methodological proposals and
             biological interpretations
             Journal of Applied Ecology
             Serial Number : 24, 1987, pp. 435-450
             ISSN : 0021-8901

 Key-Words :
             SPACE TIME STRUCTURE,CORRESPONDENCE ANALYSIS,NONPARAMETRIC TESTS,
             PEST POPULATION,LIFE HISTORY,PSYLLIODES CHRYSOCEPHALA


 Abstract      (1) Graphical representations, non-parametric tests, and
             correspondence analysis are used to describe spatial and temporal
             structure in a populatinn of a winter rape pest (Psylliodes
             chrysocephala L.) on three scales: between-plants, within-plots,
             and between-plots. (2) The between-plants variability was related
             to the egg-laying of females and to the attractiveness of plants
             for young larvae. A density-dependent regulation mechanism occurs
             at this scale, either by differential mortality, or by dispersal
             of larvae. (3) The within-plot structures were analysed in terms
             of static spatial structures, of spatial and temporal interactions,
              and of variation during the life history of the pest. (4) The
             between-plots variability is described, and a qualitative model of
             plot invasion explains the between-plots variation in infestation.
             (5) Data are discussed from the point of view of methodology and
             population biology.

 E-Mail :    thioulou@biomserv.univ-lyon1.fr
             Laboratoire de Biometrie, Genetique et Biologie des Populations
             (URA 2055) - Univ. C. Bernard LYON I - 69622 VILLEURBANNE CEDEX