Mosquitoes Adapt to Survive in Previously Inhospitable Iceland, Raising Concerns

On October 16, 2025, mosquitoes were detected in Iceland for the first time, marking a dramatic shift in the reach of one of the world's deadliest pests. Scientists warn that these mosquitoes, identified as Culiseta annulata, have effectively evolved to survive colder temperatures, exploit artificial breeding sites, and complete their life cycles in a region that was previously inhospitable.

The arrival of mosquitoes in Iceland is part of a broader pattern tied to global warming, as the country has been experiencing a steady flow of warm air from the south. This has accelerated the development of mosquitoes, increasing their survival rates and extending the mosquito season, while also creating ideal conditions for breeding and population growth.

The discovery means that Antarctica is now the only location on Earth without the vector-carrying insect. Entomologists caution that the mosquitoes' presence could have broader ecological and health implications, as they are known to be vectors for deadly diseases such as malaria, dengue, and chikungunya, although Iceland has no history of such outbreaks. The mosquitoes' remarkable adaptability and ability to thrive in new environments demonstrate the potential for future health risks if pathogens are introduced.