Etude cinétique de la structure des populations de Squilla mantis (Crustacea: Stomatopoda) par l'analyse factorielle des correspondances

The structure and evolution of populations of Squilla mantis (Crustacea: Stomatopoda) have been studied, and the statistical techniques used are discussed. Population studies were performed by multivariate analysis. Thirty-three monthly samples comprising 20 length classes of males and females were examined. Males and females display evolutionary cycles: each cycle begins in June/July and proceeds through a succession of evolution and eventual regression, the later being particularly marked every 2 years.