Iceland records first mosquitoes

Mosquitoes are a small story with big symbolism. Iceland had long been the weird exception in the Arctic — lots of ponds and wetlands, but no established mosquito record on the island itself. That changed in October 2025, when three mosquitoes were collected near Kjós and identified as *Culiseta annulata*. The insects themselves are not the scary part. What matters is what their arrival says about a warming, more connected Arctic. ### Wait — Iceland had none at all? Basically, yes. Mosquitoes had turned up before on planes or boats, but not as a confirmed find in Iceland’s natural environment. That made Iceland one of the last places on Earth without a recorded mosquito presence — alongside Antarctica. Once these specimens were confirmed, that distinction was gone. ### What exactly was found? A local insect enthusiast, Björn Hjaltason, found the insects in mid-October 2025 in Kjós, just north of Reykjavík. (e360.yale.edu) He caught them on ribbons soaked in red wine that were meant to attract moths. The specimens were sent to Matthías Alfreðsson at the Icelandic Institute of Natural History, who identified them as *Culiseta annulata* — two females and one male. ### Is this a dangerous mosquito? Not really, at least not in the way people usually fear. *Culiseta annulata* is widespread in northern Europe and is generally treated as more nuisance than major disease threat. The bigger health story is indirect — once a place becomes more hospitable to one cold-tolerant mosquito, it raises the question of whether other species could follow later. (e360.yale.edu) ### So why couldn’t mosquitoes live there before? The catch is that Iceland was never obviously impossible habitat. It has marshes, ponds, and summer conditions insects can use. But its climate seems to have blocked the full mosquito life cycle, especially the breeding conditions and winter survival needed for a population to stick. That barrier may be weakening. ### Is climate change the whole explanation? (e360.yale.edu) Probably not the whole thing — but it is the main backdrop. The Arctic is warming about four times faster than the global average, and Iceland has also been getting warmer. At the same time, shipping, tourism, military movement, and infrastructure are increasing across the Arctic, which gives species more chances to hitch rides into new places. Warmer conditions open the door; human movement helps things walk through it. ### Could these mosquitoes actually stay? That is the real test. Scientists still do not know whether the insects found in 2025 were a one-off arrival or the front edge of a lasting population. But *Culiseta annulata* is cold-tolerant and can overwinter as an adult in sheltered places like basements, barns, caves, and sheds. Finding both males and females makes establishment feel more plausible than a single accidental import. (science.org) ### Why are scientists making such a big deal of three bugs? Because arthropods are early-warning systems. Mosquitoes, midges, flies, and other small invertebrates respond quickly to temperature shifts and habitat change, and they reshape ecosystems in ways that ripple outward — pollination, food webs, disease risk, even permafrost effects in the broader Arctic. The Science editorial’s point was that Iceland’s mosquitoes are not just an oddity. They are a sign that Arctic biological boundaries are moving faster than monitoring systems are keeping up. (e360.yale.edu) ### Bottom line? Three mosquitoes do not mean Iceland suddenly has a mosquito problem. But they do mean the old assumption — that Iceland was simply outside mosquito territory — no longer holds. That is why this landed as more than a curiosity. It is a tiny, itchy marker of a much larger Arctic shift. (science.org)