Insect Pest Control Laboratory, Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, International Atomic Energy Agency, PO Box 100, 1400 Vienna, Austria - Institut de Recherche en Sciences de la Santé/Direction Régionale de l'Ouest, 01 BP 545 Bobo 01, Bobo-Dioulasso, Burkina Faso.
Insect Pest Control Laboratory, Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, International Atomic Energy Agency, PO Box 100, 1400 Vienna, Austria.
Parasite. 2020;27:22. doi: 10.1051/parasite/2020020. Epub 2020 Apr 7.
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.
埃及伊蚊和白纹伊蚊是登革热和基孔肯雅热等虫媒病毒的有效载体，这些病毒在一些地区共存，包括印度洋的留尼汪岛。在同域物种中，有一种称为“交配干扰”的生殖干扰现象已经被描述过，其中优势物种的交配会导致杂交失败，从而降低适应度，并有助于控制其他物种的传播。在这里，我们在实验室实验中研究了交配干扰，以了解针对白纹伊蚊的包括不育昆虫技术成分的控制活动对埃及伊蚊的潜在影响。我们使用不同的交配杂交来测试来自留尼汪岛的同域、同种间和异域的辐照和非辐照雄性白纹伊蚊对雌性埃及伊蚊的影响，包括在雄性比例偏斜的情况下。我们的结果表明，来自留尼汪岛的埃及伊蚊和白纹伊蚊的同域种群之间只有低水平的交配干扰。雄性白纹伊蚊与雌性埃及伊蚊的比例为 3:1 并不会增加交配干扰的水平。之前与雄性白纹伊蚊交配过的雌性埃及伊蚊不会被同种雄性阻止受精。来自留尼汪岛的异域白纹伊蚊和埃及伊蚊种群之间也没有观察到交配干扰效应。因此，来自留尼汪岛的测试埃及伊蚊种群已经对交配干扰产生了完全的抗性，如果辐照雄性白纹伊蚊过度泛滥导致类似结果，释放不育雄性白纹伊蚊可能不会抑制埃及伊蚊种群。还讨论了在同域地区管理两种有效蚊种的策略。
