Présentation des communications orales du 3rd International Symposium of Tephritid workers of Europe, Africa and the Middle East (TEAM)"

Dans le cadre de l'animation scientifique, deux doctorantes de l'Umr-Pvbmt présenteront ce jeudi 28 avril 2016 leurs sujets de travaux de recherche réalisés dans le cadre de leur thèse. Présentation en salle 1 au Pole de Protection des plantes du Cirad à Saint Pierre.

Sujets :

Ces sujets ont fait l'objet d'une communication présentée lors du "3rd International Symposium of Tephritid workers of Europe, Africa and the Middle East  (TEAM)"  du 10 au 14 avril à Stellenbosch, Afrique du Sud" 

ABIR HAFSI : "Host plant range of fruit fly community (Diptera: Tephritidae) in La Réunion Island: Larval performance and its relationship with fruit composition" 

Abstract

The family Tephritidae is able to infest a large number of host plant species. Some tephritid species are highly polyphagous, while others are stenophagous or even strictly monophagous. The host fruit affects the larval development (with potential huge impact on adult fecundity). In this study we established the relationship between available nutrients in fruits and the host specialisation of seven tephritid species in La Réunion. Three life history traits (survivorship, developmental duration and pupal weight) were studied in the laboratory for each of the 22 fruit species occurring in La Réunion. In addition, data on the nutritional composition for all the studied fruits was gathered from existing databases. The three life-history traits differ significantly depending on the fruit species. Bactrocera zonata, Ceratitis catoirii, C. rosa and C. capitata were able to survive on a larger range of fruits compared with the three other species that have a more narrow host range. Pupal weight was significantly correlated to the larval duration for Ceratitis catoirii, C. capitata, Bactrocera zonata, Zeugodacus cucurbitae, and Neoceratitis cyanescens. Co-inertia analyses on the relationship between fruit nutrients composition and survivorship of Tephritidae showed that the polyphagous fruit flies (B. zonata, C. catoirii, C. rosa and C. capitata) survived better in fruits with higher level of carbohydrate than oligophagous fruit flies (B. cucurbitae, Dacus demmerezi and N. cyanescens). This study also allows us to define the fundamental host range of the different tephritid flies which is particularly crucial to predict and prevent their invasion.

MAUD CHARLERY

Abstract

Biological invasions affect resource specialisation : long term data of fruit flies (Diptera : Tephritidae) community in Réunion Island

Publiée : 27/04/2016