Bactrocera dorsalis in the Indian Ocean: A tale of two invasions

Deschepper Pablo, Vanbergen Sam, Zhang Yue, Li Zhihong, Hassani Issa Mze, Patel Nausheen Azhaar, Rasolofoarivao Henriette, Singh Sandeep, Wee Suk Ling, De Meyer Marc, Virgilio Massimiliano, Delatte Hélène. 2023. Bactrocera dorsalis in the Indian Ocean: A tale of two invasions. Evolutionary Applications, 16 (1) : 48-61.

Url - jeu de données - Entrepôt autre : https://doi.org/10.5281/zenodo.6602072

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 multipronged 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 the stepping-stone migration of B. dorsalis from the east African coast into the Comoros, along Mayotte and into Madagascar with a decreasing genetic diversity. The Mascarene islands (Reunion and Mauritius), on the contrary, were colonized directly from Asia and formed 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 is indicative of population bottlenecks, with evidence of a more severe bottleneck for populations along the western migration pathway than on the Mascarene islands. More strict phytosanitary regulations are recommended in order to prevent the further spread of B. dorsalis.

Mots-clés Agrovoc : espèce envahissante, Bactrocera dorsalis, Tephritidae, génotype, phylogéographie

Mots-clés géographiques Agrovoc : Chine, Inde, Malaisie, Sri Lanka, Thaïlande, Comores, Mayotte, Madagascar, La Réunion, Maurice

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

Classification Agris : H10 - Ravageurs des plantes

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Agences de financement européennes : European Commission

Programme de financement européen : H2020

Projets sur financement : (EU) In-silico boosted, pest prevention and off-season focused IPM against new and emerging fruit flies ('OFF-Season' FF-IPM)

Auteurs et affiliations

• Deschepper Pablo, RMCA (BEL) - auteur correspondant
• Vanbergen Sam, RMCA (BEL) - auteur correspondant
• Zhang Yue, CAU [China Agricultural University] (CHN)
• Li Zhihong, CAU [China Agricultural University] (CHN)
• Hassani Issa Mze, National Research Institute for Agriculture (COM)
• 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)
• De Meyer Marc, Musée royal de l'Afrique centrale (BEL)
• Virgilio Massimiliano, Musée royal de l'Afrique centrale (BEL)
• Delatte Hélène, CIRAD-BIOS-UMR PVBMT (MDG)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/603173/)

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