| Autor: |
Maxime Girard, Edwige Martin, Laurent Vallon, Van Tran Van, Camille Da Silva Carvalho, Justine Sacks, Zélia Bontemps, Julie Balteneck, Florence Colin, Pénélope Duval, Simon Malassigné, James Swanson, Ian Hennessee, Stephanie Jiang, Lucrecia Vizcaino, Yamila Romer, Nsa Dada, Khan Ly Huynh Kim, Trang Huynh Thi Thuy, Christophe Bellet, Gregory Lambert, Fara Nantenaina Raharimalala, Natapong Jupatanakul, Clement Goubert, Matthieu Boulesteix, Patrick Mavingui, Emmanuel Desouhant, Patricia Luis, Rémy Cazabet, Anne-Emmanuelle Hay, Claire Valiente Moro, Guillaume Minard |
| Rok vydání: |
2023 |
| DOI: |
10.1101/2023.02.20.529246 |
| Popis: |
Human-aided invasion of alien species across the world sometimes leads to economic, health or environmental burdens. During invasion process, species encounter new environments and partially escape some ecological constrains they faced in their native range, while they face new ones. The Asian tiger mosquitoAedes albopictusis one of the most iconic invasive species that was introduced in every inhabited continent over a short period of time due to international trade. It has also been shown to be infected by a prevalent and yet disregarded gregarine entomoparasiteAscogregarina taiwanensis. In this study, we aimed at deciphering the global dynamics ofAs. taiwanensisinfection in naturalAe. albopictuspopulations and we further explored factors shaping its distribution. We showed thatAe. albopictuspopulations are highly colonized by severalAs. taiwanesisgenotypes but recently introduced ones are escaping the parasite. We further performed experiments to explain such pattern. First, we hypothesized that founder effects (i.e.population establishment by a small number of individuals) may influence the parasite dynamics. This was confirmed since experimental increase in mosquitoes’ density improves the parasite horizontal transmission to larvae. Furthermore,Ae. albopictuslarvae do not exhibit density dependent prophylaxis to control the parasite meaning that infection is not mitigated when larval density increases. Secondly, we hypothesized that unparasitized mosquitoes were more prompt to found new populations through active flight dispersal. This was, however, unlikely since parasitized mosquitoes tend to be more active than their unparasitized relatives. Finally, we hypothesized that mosquito passive dispersal (i.e.often mediated by human-aided transportation of dried eggs) affects the parasite infectiveness. Our results support this hypothesis since parasite infection decreases over time when dry eggs are stored. This study highlights the importance of global trade on parasitism escape in one of the most invasive vector species on earth. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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