Mosquitoes discovered in Iceland for the first time
Mosquitoes have been detected in Iceland for the first time, prompting speculation about how they arrived—likely via ships or containers—and whether warming temperatures will allow them to overwinter and establish a permanent population. Commenters compare Iceland’s historically mosquito-free status to heavily infested cold regions like Alaska, Siberia and Greenland, noting that many species survive extreme winters as eggs and can rapidly adapt. The conversation broadens into the ecological and public-health implications of expanding mosquito ranges, including disease risk, potential eradication or genetic control strategies, and the broader role of climate change in shifting insect habitats.
Cold survival and mosquito biology
- Several commenters are surprised mosquitoes can exist in places like Alaska or Siberia given extreme cold.
- Others explain overwintering strategies: many species survive as eggs, often protected by cryoprotectants like glycerol.
- Insects are noted as highly resilient (e.g., radioresistance) with fast breeding cycles that enable rapid adaptation.
How mosquitoes likely reached Iceland
- Consensus is that introduction is almost certainly human-mediated: ships, containers, stagnant water in tires, or possibly birds carrying insects/eggs.
- Debate over how many individuals are needed to found a population: some claim it’s unlikely enough arrive together and survive; others argue a single small water reservoir on a ship can contain dozens of larvae, making arrival common.
- One commenter points out that this may not be the first arrival, only the first time conditions allowed survival and detection.
Iceland’s climate and existing insects
- Multiple comments stress Iceland isn’t as frigid as many imagine, but is very windy, glaciated in parts, and more a “black stony desert” than a green island.
- People clarify that Iceland has long had gnats, midges, and flies; “no mosquitoes” never meant “no biting insects.”
- Biting midges are said to have appeared only in the last decade, suggesting recent shifts in insect fauna.
Comparisons with other cold regions
- Commenters note intense mosquito seasons in Greenland, Siberia, Alaska, northern Canada, and interior British Columbia, despite winter temperatures far below Iceland’s.
- Descriptions include swarms dense enough to be inhaled, livestock stressed or even suffocated, and local jokes like “Alaska state bird.”
- This leads some to argue that Iceland’s historical lack of mosquitoes must be due to factors other than just cold.
Climate change and expanding ranges
- One thread ties the Iceland finding to global warming (“+2°C”), arguing warmer winters let mosquitoes persist where they previously died out.
- A counterargument claims that since cold-adapted species already exist, warming isn’t needed for colonization; what’s changing is overwinter survival and season length, not the basic ability to travel.
Nuisance, disease, and eradication ideas
- Many express intense dislike of mosquitoes and fantasize about global eradication, sometimes bundling them with ticks, fleas, or jellyfish and snakes.
- Others push back, citing ecological roles (prey for birds, bats, etc.), though one link suggests mosquitoes may not be a critical food source.
- More targeted ideas include eliminating only disease-vector species or using Wolbachia to block pathogen transmission.
- One commenter proposes Iceland’s isolation could make it a testbed for gene-drive–based eradication, though this is not further explored.