Seasonal effects and fine-scale population dynamics of Aedes taeniorhynchus, a major disease vector in the Galapagos Islands

Research reveals that coastal and highland populations of the mosquito Aedes taeniorhynchus in the Galápagos Islands exhibit strong genetic differentiation year-round, with limited gene flow occurring only during periods of increased precipitation. This suggests that ecological differences between habitats drive adaptation and divergence, potentially leading to incipient speciation. Highland populations show signs of founder effects or reduced breeding sites, yet maintain genetic diversity over time, implying survival through dry periods as dormant eggs. Mosquito abundance in highlands is strongly linked to precipitation, while coastal populations are more influenced by tide height. These findings highlight potential differences in mosquito-borne disease dynamics between habitats and increased infection risk during wetter conditions.

BATAILLE, A., CUNNINGHAM, A. A., CRUZ, M., CEDENO, V., & GOODMAN, S. J. (2010). Seasonal effects and fine-scale population dynamics of Aedes taeniorhynchus, a major disease vector in the Galapagos Islands. Molecular Ecology, 19(20), 4491–4504. https://doi.org/10.1111/j.1365-294x.2010.04843.x