Bactrocera dorsalis (Diptera: Tephritidae) in the Indian Ocean: a tale of two invasions

Deschepper Pablo, Vanbergen Sam, Zhang Yue, Mze Hassani I., Patel Nausheen Azhaar, Rasolofoarivao Henriette, Singh Sandeep, Wee Suk Ling, Virgilio Massimiliano, Delatte Hélène, De Meyer Marc. 2023. Bactrocera dorsalis (Diptera: Tephritidae) in the Indian Ocean: a tale of two invasions. In : ECE 2023 - Books of abstracts. Heraklion : Hellenic Entomogical Society, Résumé, 481-482. European Congress of Entomology. XII, Heraklion, Grèce, 16 Septembre 2023/20 Septembre 2023.

Résumé : An increasing number of invasive fruit fly pests are colonizing new grounds. With this study we aimed to uncover the invasion pathways of the oriental fruit fly, Bactrocera dorsalis into the islands of the Indian Ocean. By using genome wide SNP data and a multi-pronged approach consisting of PCA, ancestry analysis, phylogenetic inference and kinship networks, we were able to resolve two independent invasion pathways. A western invasion pathway involved stepping-stone migration of B. dorsalis from the east African coast into the Comoros, along Mayote and into Madagascar with a decreasing genetic diversity. The Mascarene islands (Reunion and Mauritius) on the other hand were colonized directly from Asia and form a distinct cluster. The low nucleotide diversity suggests that only a few genotypes invaded the Mascarenes. The presence of many long runs of homozygosity (ROH) in the introduced populations are indicative of population botlenecks, with evidence of a more severe botleneck for populations along the western migration pathway than on the Mascarene islands. More strict phytosanitary regulations are recommended in order to prevent further spread of B. dorsalis

Mots-clés libres : Bactrocera dorsalis, Phylogeography, Invasive species, Indian Ocean, Pest species

Auteurs et affiliations

• Deschepper Pablo, RMCA (BEL)
• Vanbergen Sam, RMCA (BEL)
• Zhang Yue, CAU [China Agricultural University] (CHN)
• Mze Hassani I., Université d'Antananarivo (MDG)
• Patel Nausheen Azhaar, Ministry of Agro Industry and Food Security (Maurice) (MUS)
• Rasolofoarivao Henriette, FOFIFA (MDG)
• Singh Sandeep, Punjab Agricultural University (IND)
• Wee Suk Ling, Universiti Kebangsaan Malaysia (MYS)
• Virgilio Massimiliano, Musée royal de l'Afrique centrale (BEL)
• Delatte Hélène, CIRAD-BIOS-UMR PVBMT (REU)
• De Meyer Marc, Musée royal de l'Afrique centrale (BEL)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/606986/)

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