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

Parasite

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.

Published: December 2020

AI Article Synopsis

  • - Aedes aegypti and Aedes albopictus are mosquito species that transmit diseases like dengue and chikungunya, and their interactions were studied on La Réunion island to understand their reproductive behaviors.
  • - The study investigated a phenomenon called satyrization, where mating between different species doesn't produce offspring, potentially limiting the spread of one species by the other.
  • - Findings indicated low levels of satyrization between the two mosquito species, suggesting that introducing sterile male Ae. albopictus may not effectively control Ae. aegypti populations, raising questions about management strategies in areas where they coexist.

Article Abstract

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.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7137539PMC
http://dx.doi.org/10.1051/parasite/2020020DOI Listing

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