Mosquitoes Discovered In Iceland

An editorial published in Science by Arctic researchers examines a recent ecological turning point: the arrival of mosquitoes in Iceland, long considered the only Arctic nation without them. Mosquitoes were detected just north of Reykjavík in 2025, marking the end of Iceland’s unique, mosquito-free status. Supporting reports note that three specimens of Culiseta annulata were found in a garden in Kiðafell, likely introduced through human movement from regions where the species is common.

The authors argue that this seemingly small event signals a much larger shift in the regional climate. The Arctic warms at roughly four times the global average, and as human activity (such as shipping, tourism, and infrastructure) expands, species are moving into new areas at unprecedented rates. Mosquitoes in Iceland highlight how unprepared the region is to detect and respond to biological changes before they become widespread problems.

Arthropods, including insects and spiders, dominate Arctic biodiversity, making up 90% of known species near the poles. Despite their diminutive size, they are essential to ecosystem function: they pollinate plants, recycle nutrients, regulate other species, and sustain food webs that connect wildlife and human livelihoods. Because their life cycles are tightly linked to environmental conditions, they also serve as early indicators of ecological disruption.

Evidence of disruption is already visible across the ecosystem. Climate-driven shifts in insect timing can leave Arctic shorebird chicks without sufficient food. Caribou and reindeer face increasing stress from biting insects and parasites, which affects their health and reproduction. Periodic insect outbreaks can strip vegetation, altering landscapes in ways that accelerate permafrost thaw and amplify climate change through greenhouse gas release. These effects extend beyond the Arctic, influencing global climate systems.

Despite these risks, monitoring efforts remain fragmented and inconsistent. The researchers emphasize that arthropods are poorly monitored across the Arctic, with scientists unable to navigate large swaths of inhospitable terrain--leaving major blind spots in understanding environmental change. Researchers stress that without coordinated, long-term observation, it is difficult to determine where species are spreading, whether they are establishing populations, and which communities are most vulnerable. They call for an internationally coordinated monitoring system, building on existing efforts and incorporating Indigenous knowledge as a central component.

The editorial concludes that Iceland’s mosquitoes are a warning sign. Arctic ecosystems are undergoing rapid, interconnected changes, and without better surveillance, future biological surprises may go undetected until their consequences are far more severe.