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Objectif: Tribolium castaneum , est un coleoptere qui a la capacite d’infester toutes les cereales et legumineuses entreposees. Sa capacite a derouler son cycle de developpement sur divers substrats alimentaires a suscite des reflexions sur son adaptabilite morphologique. Cette etude a pour objectif d’identifier la morphologie de T. castaneum a Widou sur differentes cereales. Methodologie et resultats: Trois populations ont ete definies en fonction de la cereale (mais, mil ou riz) sur laquelle T. castaneum a deroule son cycle de developpement. Chacune des populations est constituee de 30 adultes mâles. Sur chaque adulte, 19 variables ont ete mesurees. Les distances entre des yeux dorsalement et ventralement ( Dyd , Dyv ), la largeur du femur_3 ( lf3 ) et des elytres ( lme ) sont eliminees de l’analyse car ne presentant aucune variabilite entre les differents individus. Les 15 variables restantes sont utilisees pour des Analyses en Composante Principale. La taille est le premier facteur qui discrimine la population mil des autres. Suite a la transformation logarithmique des donnees brutes, l’Analyse discriminante a montre une difference de forme entre les trois populations. La classification ascendante hierarchique a montre trois groupes morphometriques. Le groupe_1 domine par les individus du mil est plus morphologiquement homogene. Le groupe_2 est domine par les individus du riz et le groupe_3, le plus morphologiquement heterogene, ne renferme que des individus du mais. Conclusion et application des resultats: Ce present travail contribue a la mise en place d’une lutte integree contre T. castaneum . La connaissance de la diversite populationnelle de ce ravageur primaire des cereales stockees est necessaire pour la mise en place une lutte adaptee selon sa variabilite morphogenetique. Mots cles: Tribolium castaneum , biotype, ACP, morphometrie, AD, Widou Thiengoli, CAH English Title: Morphometric identification of populations of Tribolium castaneum Herbst (Coleoptera, Tenebrionidae) subservient to three cereals at Widou Thiengoli English Abstract Objective: Tribolium castaneum is a beetle that has the ability to infest all stored cereals and legumes. Its ability to unfold its development cycle on various food substrates has prompted reflections on its morphological adaptability. This study aims to identify the morphology of T. castaneum in Widou Thiengoli on different cereals. Methodology and results: Three populations were defined according to cereals (maize, millet or rice) on which T. castaneum developed its development cycle. Each population consists of 30 adult males. On each adult, 19 variables were measured. The distances between the dorsal and ventral eyes ( Dyd , Dyv ), the width of the femur_3 ( lf3 ) and the elytra ( lme ) are eliminated from the analysis because no variability between the different individuals. The remaining 15 variables are used for Principal Component Analyzes. Size is the primary factor that discriminates the millet population of others. Following the logarithmic transformation of the raw data, Discriminant Analysis showed a difference in shape between the three populations. Hierarchical ascending classification showed three morphometric groups. The group_1 dominated by biotype millet individuals is more morphologically homogeneous. Rice individuals dominate group 2 and group 3, the most morphologically heterogeneous, contains only maize individuals. Conclusion and application of results: There is a morphological difference between the three populations of T. castaneum defined according to the food support, but the hypothesis of a morphological adaptation of T. castaneum on different food substrates can only be confirmed by varying the geographical sites. This present work contributes to the setting up of integrated struggle of T. castaneum . Knowledge of the population diversity of this primary pest of stored grains is necessary for the setting up of an adapted struggle according to its genetic variability. Keywords: Tribolium castaneum , biotype, PCA, morphometry, AD, Widou Thiengoli, CAH

journal of applied biosciences

Identification morphométrique des populations de &lt;i&gt;Tribolium castaneum&lt;/i&gt; Herbst (Coleoptera, Tenebrionidae) inféodées à trois céréales à Widou Thiengoli