Mosquitos detected in Iceland for first time as climate change reshapes Arctic

A threshold crossed in the Arctic's warming
Iceland's first documented active mosquito population signals how rapidly climate change is reshaping polar ecosystems.

Durante siglos, Islandia fue uno de los pocos lugares del mundo sin mosquitos, un hecho tan constante como su paisaje volcánico. En octubre de 2025, esa distinción llegó a su fin cuando tres ejemplares vivos de Culiseta annulata fueron capturados en el sur del país, confirmando por primera vez una población activa de mosquitos en la isla. El hallazgo no es solo una curiosidad entomológica: es el reflejo de un Ártico que se calienta cuatro veces más rápido que el resto del planeta, reescribiendo las reglas de qué puede vivir dónde y cuándo.

  • Por primera vez en la historia documentada, mosquitos vivos y potencialmente reproductores han sido confirmados en Islandia, rompiendo una distinción climática que duró siglos.
  • El Ártico se calienta cuatro veces más rápido que el promedio global, y los inviernos islandeses ya no son lo suficientemente severos para impedir que especies templadas hibernen y sobrevivan.
  • La especie encontrada, Culiseta annulata, posee una estrategia de hibernación que le permite refugiarse en sótanos y graneros durante el invierno, lo que podría permitirle establecer colonias permanentes.
  • Los científicos advierten que este hallazgo es parte de un patrón más amplio: glaciares en retroceso, nuevas especies marinas en aguas islandesas y ecosistemas árticos transformándose en tiempo real.
  • Las autoridades y expertos observan con atención si la especie logrará asentarse de forma definitiva, lo que marcaría un punto de no retorno en la colonización de regiones polares por especies de zonas templadas.

Durante siglos, Islandia mantuvo una distinción casi única en el mundo: era un refugio sin mosquitos. Su aislamiento y su clima implacable habían mantenido a los insectos fuera de la isla a lo largo de toda la historia registrada. Eso cambió en octubre, cuando los científicos confirmaron algo sin precedentes: mosquitos vivos en Islandia.

El descubrimiento ocurrió el 16 de octubre en Kiðafell, en el municipio de Kjós, al sur del país. Björn Hjaltason, un entomólogo aficionado que utiliza trampas caseras empapadas en vino, capturó un ejemplar inusual al caer la noche. Dos más fueron encontrados en el mismo lugar. El entomólogo Matthías Alfreðsson, del Instituto de Ciencias Naturales de Islandia, los identificó como Culiseta annulata, una especie conocida por su resistencia al frío. A diferencia de especímenes anteriores llegados en avión —muertos o inactivos—, estos tres estaban vivos.

La clave de su supervivencia está en su estrategia de hibernación: la especie pasa el invierno refugiada en sótanos, graneros y almacenes donde la temperatura se mantiene sobre cero. Alfreðsson señaló que esta capacidad podría permitirle establecer colonias permanentes. Hjaltason apuntó al puerto cercano de Grundartangi como posible vía de entrada, pero el transporte solo explica la llegada, no la supervivencia. El factor decisivo fue la temperatura.

El Ártico se calienta cuatro veces más rápido que el resto del planeta, e Islandia lo siente con intensidad. Los inviernos son menos severos, los períodos de deshielo se alargan y la ventana en la que el agua permanece líquida —esencial para el desarrollo de las larvas— se amplía. Los glaciares retroceden. Especies como la caballa del Atlántico aparecen en aguas islandesas. El ecosistema se transforma en tiempo real.

Lo que hace significativo este hallazgo no son los mosquitos en sí, sino lo que representan: un umbral cruzado. Por primera vez, las condiciones en Islandia son lo suficientemente hospitalarias para que un insecto de zona templada no solo llegue, sino que sobreviva y potencialmente prospere. Los mosquitos son el canario en la mina de carbón, excepto que el canario acaba de aterrizar y parece dispuesto a quedarse.

For centuries, Iceland held a distinction few places on Earth could claim: it was a refuge from mosquitoes. The island's isolation and brutal climate had kept the insects at bay through all of recorded history. That streak ended in October, when scientists confirmed something that had never happened before—mosquitoes, living and breeding, in Iceland.

The discovery came on the evening of October 16th in Kiðafell, a small area in the municipality of Kjós in southern Iceland. Björn Hjaltason, an amateur entomologist who studies insects using homemade traps soaked in wine, noticed something unusual as dusk fell. He collected the specimen and preserved it. Two more mosquitoes were found in the same location. When Matthías Alfreðsson, an entomologist at Iceland's Institute of Natural Sciences, examined them, he identified them as Culiseta annulata—a species known for its ability to survive in cold climates. It was the first time active, breeding mosquitoes had ever been documented in Iceland. Specimens had arrived before on aircraft, but they were dead or dormant. These three were different. They were alive, and they suggested something larger was changing.

Culiseta annulata is common across northern Europe, and its survival strategy is elegant: it hibernates. During winter, the mosquitoes shelter in basements, barns, and storage buildings where temperatures stay above freezing. In those protected spaces, they wait out the cold. Alfreðsson explained to reporters that this capacity for hibernation could allow the species to establish permanent colonies in Iceland. Hjaltason suggested the nearby port of Grundartangi, which handles regular ship and container traffic, may have been the entry point for the first arrivals. But transport alone doesn't explain why they survived. The real factor was temperature.

The Arctic is warming at a rate that staggers climate scientists—four times faster than the rest of the planet. Iceland is feeling that acceleration acutely. Winters are becoming less severe. Thaw periods are stretching longer. The window during which water remains liquid, essential for mosquito larvae to develop, is expanding. The island's glaciers are retreating. Species that belong in warmer waters—Atlantic mackerel, for instance—are appearing in Icelandic seas. The ecosystem is shifting in real time, and the mosquitoes are a visible marker of that shift.

What makes this discovery significant is not the mosquitoes themselves, though their arrival will certainly be felt by anyone spending time outdoors. It is what they represent: a threshold crossed. For the first time in history, conditions in Iceland have become hospitable enough for a temperate-zone insect to not just arrive, but to survive and potentially thrive. If Culiseta annulata establishes itself, it will be one of many species that climate change is pushing northward into the Arctic. The mosquitoes are the canary in the coal mine, except the canary has just landed and is settling in to stay.

These mosquitoes can pass the winter sheltered in basements, barns, or storage buildings where temperature stays above freezing, potentially allowing them to establish permanent colonies in Iceland.
— Matthías Alfreðsson, entomologist, Institute of Natural Sciences of Iceland
La Conversación del Hearth Otra perspectiva de la historia
Inventor

Why does it matter that mosquitoes arrived in Iceland specifically? Aren't insects always moving around?

Model

Because Iceland was one of the last places on Earth where they couldn't survive. It's not just that a new insect showed up—it's that the climate changed enough to make the impossible possible.

Inventor

So this is about the speed of warming, not just warming itself?

Model

Exactly. The Arctic is heating four times faster than anywhere else. That's not gradual. That's a system in rapid transition. The mosquitoes are proof the transition is real and measurable.

Inventor

Could these three mosquitoes just die out? Or are they likely to establish colonies?

Model

They could die out, but the conditions that let them survive the winter—sheltered spaces staying above freezing—will persist and probably improve. If more arrive, which is likely given the port traffic, you're looking at permanent settlement.

Inventor

What happens to Iceland if mosquitoes establish themselves?

Model

Ecologically, it's one piece of a larger reshaping. Warmer waters bring different fish. Glaciers vanish. The whole food web adjusts. For people, it means outdoor life becomes less pleasant in summer, disease vectors potentially arrive, and the island's identity as a pristine, isolated place shifts.

Inventor

Is this reversible?

Model

Not at the speed we're talking about. Even if emissions stopped tomorrow, the warming already baked into the system would continue for decades. The mosquitoes, if they establish, aren't going anywhere.

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