Iceland has confirmed the presence of mosquitoes in the wild for the first time after identifying three copies in the Kjós area. This is a biological milestone for a country that, until now, was one of the few territories on the planet without a stable population of these insects, a scenario that many scientists considered matter of time.
Specialists point to a combination of factors: a increasingly temperate environment and the possible accidental arrival in ships, containers, or aircraft. This finding fits into a trend observed in Europe—including Spain—where several species are expanding their range due to the effects of climate and global mobility.
An unprecedented find in Kjós
The insect enthusiast Björn Hjaltason On October 16, he spotted what looked like a peculiar fly attached to red wine-soaked strings used to attract moths. Shortly after, he captured two additional individuals in the same area. Chose, near Reykjavik, and sent the specimens to the Natural History Institute of Iceland for analysis.
The entomologist MatthÃas Alfreðsson confirmed that the insects belong to the species Culiseta annulata and specified that they were identified two females and one maleMosquitoes have been found on airplane fuselages landing in the country on previous occasions, but their presence outdoors had never been certified, nor in sufficient numbers to be considered a local record.
The location of the discovery in the surroundings of Kidafell (Kjós) fits with areas that can offer discreet refuges. Although it is too early to speak of a stable population, the simple record It marks a before and after in the natural history of Iceland and opens the door to systematic monitoring.
The Natural History Institute stresses that the immediate priority is to verify whether this is an isolated episode or the beginning of a colonizationTo this end, they ask the public to report new observations with photographs and, when possible, specimens for analysis.
A species prepared for the cold: Culiseta annulata
Culiseta annulata It is a relatively large mosquito, present in much of Europe and able to withstand low temperatures. During the cold months, their adults can take refuge indoors—such as in basements, stables, or barns—a strategy that increases their chances of survival in harsh climates.
In terms of behavior, those responsible for the bite —they need protein for egg development—are the females, while the males feed on nectar. The biology of the species, with its cold tolerance and ability to take advantage of shelters, fits with the conditions that could be found in Iceland if winters continue to milder.
Their distribution includes regions as diverse as the British Isles and continental climate zones. This pattern suggests that, if they find suitable microhabitats, mosquitoes could persist despite severe winter episodes.
The weather opens the door
Iceland experiences a accelerated warming compared to previous decades, with longer autumns and longer periods of liquid water in ponds and pools. This context provides favorable conditions for mosquitoes to complete their cycle: more available laying sites and greater survival of larvae and adults.
Unusually high temperatures were recorded in May - with values ​​reaching 26,6 ° C in the east of the country—and climate attribution analyses indicate that extreme heat events are now much more likely than in a climate without human influence. This backdrop reinforces the hypothesis that several species will find it easier settle on the island.
Now, the researchers avoid reductionism: climate change may facilitate survival, but the initial arrival could also be explained by the international mobilityThe transit of goods, containers, and aircraft provides opportunities for insects to travel unnoticed and, if they coincide with favorable environmental conditions, thrive.
The immediate scientific challenge is to measure precisely to what extent climate, on its own, would allow Culiseta annulata overcome the Icelandic winter, and what role do the microshelters created by human activity.
Europe and Spain: signs that invite vigilance
The phenomenon does not occur in a vacuum. In the United Kingdom eggs have recently been detected Aedes aegypti and presence of Aedes albopictus in the southeast of England, while in Spain The tiger mosquito has spread rapidly and has already been recorded in more than a thousand municipalities. Furthermore, the circulation of the Sindbis virus in mosquitoes in the southwest of the country.
Although Culiseta annulata is not a relevant vector of human diseases, the expansion of mosquitoes in Europe underlines the importance of strengthening the entomological surveillance, improve citizen notification and control breeding sites such as containers with stagnant water in urban and peri-urban areas.
How they arrived and what will be done now
Alfreðsson and his team consider several plausible entry routes: ships and containers coming from ports near the area of ​​discovery or even air transport, routes by which individuals of other species were detected in the past at Icelandic airports. The difference now is that the three specimens were found outdoor.
The Institute of Natural History coordinates a plan of pursuit to confirm whether records are repeated over time and space. If new sightings arise, scientists will be able to estimate whether local reproduction is occurring, identify hotspots, and assess appropriate management measures.
The discovery of these three mosquitoes does not seem to be a merely anecdotal episode: it reflects how the combination of milder climate, humid landscapes And global mobility can alter biogeographic boundaries that once seemed solid. For Iceland, which had been living without the buzz, a period of close observation and shared learning from the European experience is beginning.
