Mosquitoes in Iceland: A Sign of Arctic Ecological Shift
Until recently, Iceland was considered the last Arctic nation without mosquitoes. That changed in October 2025, when insect enthusiast Björn Hjaltason discovered one male and two female specimens of Culiseta annulata in his garden in Kiðafell, Kjós. This unexpected arrival is more than just a local curiosity; it’s a warning sign, according to Arctic researchers Amanda Koltz and Lauren Culler. It reflects a significant ecological shift driven by a warming climate and the increasing expansion of human activity across the region, causing insect species to move in unprecedented ways and at new scales.
Global Impacts from Arctic Changes
As these changes reshape Arctic ecology, they will inevitably have global impacts. “What happens in the Arctic doesn’t stay in the Arctic,” explains Culler, a research associate professor and senior fellow at Dartmouth College’s Institute of Arctic Studies, in an interview with Gizmodo. “Some of the ways that ecosystems are changing in the Arctic have feedbacks to the climate system that influence what’s happening in the lower latitudes.” Therefore, studying these changes is critical to understanding both the regional and global consequences of a warming Arctic.
The Importance of Arthropod Monitoring
The challenge lies in the lack of a robust monitoring system to track these changes. Arthropods – encompassing mosquitoes and all other insects – constitute the most biodiverse animal group in the Arctic, representing roughly 90% of all known species near the poles. These tiny invertebrates wield a huge influence over the broader ecosystem.
- They pollinate plants
- They recycle nutrients
- They regulate populations through parasitism
- They sustain food webs connecting plants, wildlife, and people
However, as the Arctic warms four times faster than the rest of the planet, arthropod populations, distributions, and activity patterns are rapidly changing. These shifts can trigger cascading effects that ripple across entire ecosystems. Researchers are already observing consequences, such as mismatches between Arctic-breeding shorebird hatching and food availability, increased parasitism of caribou and reindeer, and even outbreaks of herbivorous insects wiping out tundra vegetation, accelerating permafrost thaw.
The Iceland Mosquito Mystery
Regarding the emergence of Culiseta annulata in Iceland, it’s still too early to determine the consequences. Scientists are working to understand how the species arrived. Culler suggests that human movement between Iceland and the species’ primary range – spanning Europe, Central Asia, and North Africa – may have allowed a few individuals to hitchhike to the Arctic nation. Confirming this hypothesis, and crucially, determining whether Culiseta annulata has established itself in Iceland, requires a more robust long-term monitoring system.
“We don’t really know how widespread this is, and we don’t really have enough information to understand if these [mosquitoes] are actually able to survive and reproduce in this new location, which would potentially lead to the persistence of this species in Iceland,” Culler states.
Building a Collaborative Monitoring System
Current long-term arthropod monitoring efforts are limited and scattered across the Arctic. This is largely due to the region’s vastness, encompassing multiple nations and extreme, inaccessible environments. “Across most parts of the Arctic, including Alaska, it’s very challenging to detect species moving around. It’s something that we need to do a better job of,” explains Koltz, an assistant professor in the Department of Integrative Biology at the University of Texas at Austin.
Through the Network for Arthropods in the Tundra, Culler, Koltz, and colleagues are working to identify key species for monitoring and designing standardized protocols for implementation across the Arctic. However, building an internationally coordinated system requires buy-in from Arctic nations.
“Arctic researchers are a collaborative group and there’s a lot of motivation from the scientific community to improve monitoring,” Koltz emphasizes. “Biological changes don’t respect national boundaries, and effective science can’t be confined by them either. Enhancing biodiversity monitoring is a win-win. It’s an issue of shared interest and opportunity for collaboration across the different Arctic nations.”
Explore more on these topics
