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Aedes aegypti  and  Aedes albopictus  are competent vectors of arboviruses such as dengue and chikungunya viruses which co-exist in some areas, including La Réunion island, Indian Ocean. A type of reproductive interference called satyrization has been described in sympatric species where dominant species mating fails to produce hybrids and thus reduces the fitness and tends to control the spread of the other species. Here, we investigated satyrization in laboratory experiments to provide insights on the potential impact on  Ae. aegypti  of a control campaign including a sterile insect technique component against  Ae. albopictus . Different mating crosses were used to test sympatric, conspecific-interspecific and allopatric effects of irradiated and non-irradiated male  Ae. albopictus  on female  Ae. aegypti , including in a situation of skewed male ratio. Our results suggest that there was only a low level of satyrization between sympatric populations of  Ae. aegypti  and  Ae. albopictus  colonized from La Réunion island. A male  Ae. albopictus  to female  Ae. aegypti  ratio of 3:1 did not increase the level of satyrization. Female  Ae. aegypti  previously mated to male  Ae. albopictus  were not prevented from being inseminated by conspecific males. A satyrization effect was not seen between allopatric  Ae. albopictus  and  Ae. aegypti  strains from La Réunion Island either. The tested  Ae. aegypti  strain from La Réunion island has therefore developed full resistance to satyrization and so releasing sterile male  Ae. albopictus  may not suppress  Ae. aegypti  populations if an overflooding of irradiated male  Ae. albopictus  leads to similar results. The management strategy of two competent species in a sympatric area is discussed.

Demonstration of resistance to satyrization behavior in Aedes aegypti from La Réunion island