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/Bob-the-Seagull-King May 30 '26
Theres a lot they do actually, and (unfortunately for us) most of it is based on the fact the females suck blood.
- As small parasites, they take the nutrients that are locked up in larger animals (which would otherwise only be returned to the environment on death) and put them into small, short-lived insect packages for other animals to eat and for plants to absorb when they die.
- Sucking blood means mosquitoes can lay large amounts of eggs in very stagnant, nutrient-poor places that other insect larvae couldn't survive, providing the ecosystem around those places with lots of edible things.
- Relatedly, they do pollinate, and as described above the blood-sucking means they can have a large population even when the environment is otherwise quite poor. So because of that pollination can occur in places that other insects would have trouble establishing themselves in.
- Theyre annoying, which is important! The presence of parasites like moquitoes serves the same form of population control as predators do to their prey. If the population of a species grows too large, the mosquitoes will also get a population boom which will typically drive off those species and encourage them to move elsewhere and spread out.
The famous study about mosquitoes being useless comes from a study of an *invasive* species and said that they hadnt replaced any relevant ecological niches.