Bioecology of the invasive B biotype compared to the indigenous Ms biotype of Bemisia tabaci on tomato

Reynaud Bernard, Delatte Hélène, Duyck Pierre François, Triboire Aurélie, Becker Nathalie, David Patrice. 2008. Bioecology of the invasive B biotype compared to the indigenous Ms biotype of Bemisia tabaci on tomato. In : Celebrating Entomology: Contributions to Modern Science : ICE 2008 : 23rd International Congress of Entomology, Durban, South Africa, 6-12 July, 2008. s.l. : s.n., Diaporama, (15 vues) International Congress of Entomology. 23, Durban, Afrique du Sud, 6 Juillet 2008/8 Juillet 2008.

Résumé : Studies on success or failures of biological invasions by different insect biotypes are scarce and could provide interesting insights into the traits that determine greater or lower ability to invade. Life history traits of invasive whiteflies Bemisia tabaci of the B biotype (known as a worldwide invasive biotype) and of the indigenous biotype Ms (not known as an invader anywhere in the world), both from the island of La Réunion (Indian Ocean), were compared for this purpose. In our study we demonstrated that within a cultivated host plant (tomato), the B biotype differs from the Ms by a combination of several life-history traits. This combination gives the invasive biotype an advantage over the resident both in terms of rapid demographic growth (increased intrinsic rate of increase and associated traits such as short developmental times and high fecundity) and in terms of competition (large adult and offspring sizes), without any recorded trade off. However, in the field the resident biotype remains dominant on noncultivated hosts (weeds) and in a particular climate (high humidity). This suggests that invasive biotypes are characterized by physiological, morphological and biological adaptations to a relatively uniform environment created by anthropic activities at different places in the world, while resident biotypes may persist in less altered habitats.

Classification Agris : H10 - Ravageurs des plantes

Auteurs et affiliations

• Reynaud Bernard, CIRAD-BIOS-UMR PVBMT (REU)
• Delatte Hélène, CIRAD-BIOS-UMR PVBMT (REU)
• Duyck Pierre François, CIRAD-BIOS-UMR PVBMT (REU) ORCID: 0000-0001-5484-1970
• Triboire Aurélie, CIRAD-BIOS-UMR PVBMT (REU)
• Becker Nathalie, MNHN (FRA)
• David Patrice, CNRS (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/559524/)

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