Cross-Mating Compatibility and Competitiveness among Aedes albopictus Strains from Distinct Geographic Origins - Implications for Future Application of SIT Programs in the South West Indian Ocean Islands.
The production of large numbers of males needed for a sustainable sterile insect technique (SIT) control program requires significant developmental and operational costs. This may constitute a significant economic barrier to the installation of large scale rearing facilities in countries that are undergoing a transition from being largely dependent on insecticide use to be in a position to integrate the SIT against Aedes albopictus. Alternative options available for those countries could be to rely on outsourcing of sterile males from a foreign supplier, or for one centralised facility to produce mosquitoes for several countries, thus increasing the efficiency of the mass-rearing effort. However, demonstration of strain compatibility is a prerequisite for the export of mosquitoes for transborder SIT applications. Here, we compared mating compatibility among Ae. albopictus populations originating from three islands of the South Western Indian Ocean, and assessed both insemination rates and egg fertility in all possible cross-mating combinations. Furthermore, competitiveness between irradiated and non-irradiated males from the three studied strains, and the subsequent effect on female fertility were also examined. Although morphometric analysis of wing shapes suggested phenoptypic differences between Ae. albopictus strains, perfect reproductive compatibility between them was observed. Furthermore, irradiated males from the different islands demonstrated similar levels of competitiveness and induced sterility when confronted with fertile males from any of the other island populations tested. In conclusion, despite the evidence of inter-strain differences based on male wing morphology, collectively, our results provide a new set of expectations for the use of a single candidate strain of mass-reared sterile males for area-wide scale application of SIT against Ae. albopictus populations in different islands across the South Western Indian Ocean. Cross-mating competitiveness tests such as those applied here are necessary to assess the quality of mass reared strains for the trans-border application of sterile male release programs.
Institut de Recherche pour le Développement (IRD), Unité Mixte de Recherche MIVEGEC (IRD 224-CNRS 5290-UM1-UM2), Montpellier, France.|IRD La Réunion - Plateforme de Recherche CYROI, Sainte-Clotilde, Reunion Island, France.
David
D
Damiens
IRD La Réunion - Plateforme de Recherche CYROI, Sainte-Clotilde, Reunion Island, France.
Cyrille
C
Lebon
Université de La Réunion, Unité Mixte de Recherche « Processus Infectieux en Milieu Insulaire Tropical (UMR PIMIT) », INSERM U1187-CNRS9192-IRD249. Plateforme de Recherche CYROI. Ste Clotilde, Saint-Denis, La Réunion, France.
David A
DA
Wilkinson
Université de La Réunion, Institut Universitaire de Technologie, Département Génie Biologique, Saint Pierre, La Réunion, France.
Damien
D
Dijoux-Millet
Institut de Recherche pour le Développement (IRD), Unité Mixte de Recherche MIVEGEC (IRD 224-CNRS 5290-UM1-UM2), Montpellier, France.|IRD La Réunion - Plateforme de Recherche CYROI, Sainte-Clotilde, Reunion Island, France.
Gilbert
G
Le Goff
Vector Biology and Control Division, Ministry of Health and Quality of Life, SSR Botanical Garden Rd, Curepipe, Mauritius.
Ambicadutt
A
Bheecarry
Institut de Recherche pour le Développement (IRD), Unité Mixte de Recherche MIVEGEC (IRD 224-CNRS 5290-UM1-UM2), Montpellier, France.|IRD La Réunion - Plateforme de Recherche CYROI, Sainte-Clotilde, Reunion Island, France.
Louis Clément
LC
Gouagna
D000330:Aedes; D000818:Animals; D005260:Female; D007195:Indian Ocean Islands; D007246:Infertility; D007314:Insemination; D008297:Male; D009032:Mosquito Control / Q000379:methods*; D011839:Radiation, Ionizing; D012726:Sexual Behavior, Animal