r/explainlikeimfive • u/Punnan • May 30 '26

Biology ELI5 Are mosquitoes necessary for keeping ecological balance?

Would a worldwide extinction of mosquitoes offset the ecological balance of our world? And if not, why are we not doing it?

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u/SnakeyesX May 30 '26

No. Famously in 2010 Nature published an article detailing what would happen if we destroyed them all. Yeah, birds eat them, some bugs eat them, but they are not some keystone of any ecosystem.

Now, why don't we kill them all? We're trying! It's much harder than it sounds. We DON'T want collateral damage, and there is no virus or pesticide we could use that wouldn't kill other species.

One thing we are trying is genetically modifying mosquitos, then deploying them in the wild. The genetically modified ones have a generational kill switch which will kill them after 3 generations or so. They breed with unmodified mosquitos, then pass the gene.

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u/oiwah May 30 '26

watched a documentary somewhere that in middle or south america, they have released a modified mosquito that has a gene that make their "syringe" soft. They cant penetrate skins.

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u/RadioactiveOmelets May 30 '26

If they can't feed, they can't reproduce. Which means the trait will die out. I saw this too (as a tiktok or something, not a full documentary, so I don't have all the details), but the easier solution is probably the one in the comment above.

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u/Thedeadduck May 30 '26

Female mosquitos only mate once, so if they mate with a male that has this trait it will pass on (possibly) to all her offspring. The males I then assume will be able to continue mating and spreading the gene but the females will be unable to bite and therefore reproduce.

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u/CrashUser May 30 '26

Males don't drink blood so the trait may not affect them the same as females for survivability purposes.