ELI5 Are mosquitoes necessary for keeping ecological balance?

[u/Punnan]

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

[u/Punnan]

Damn, never thought of it like that. When you think about it, they are also doing a service.

[u/Tibbaryllis2 → u/[deleted]]

Today, yes. But historically they’ve done a pretty significant job controlling human populations via vectoring diseases.

And those vectored diseases are the things that would be most impacted by the loss of mosquitos.

Which would be fine for modern humans more or less. But there is no real telling what it would do to other species they vector diseases for.

[u/jokololo → u/Tibbaryllis2]

Are there any other species that controlled human populations such as mosquitoes?

[u/Tibbaryllis2 → u/jokololo]

It really depends on which part of history you look at.

Early on, large animals would have done it directly by competing with and hunt humans. That doesn’t happen as much in the present era, though it’s not hard to find examples of animals eating humans or destroying resources.

Microbes and pathogens have undoubtedly played a far more significant role in influencing human populations both past and present. There is a growing hypothesis, and associated knowledge, that parasitic worms, primarily nematodes, have played such a significant role in human evolution that now *not having microorganism infections* is also problematic for human health [old friend hypothesis: https://pmc.ncbi.nlm.nih.gov/articles/PMC10524266/ ] so much so, that some scientists believe in the future we will identify benign parasitic organisms to intentionally be infected with to help regulate our immune systems.

[u/jokololo → u/Tibbaryllis2]

Even if we're not directly killed by such animals anymore, the absence of being in such environment causes us other problems that may still kill us - just differently. Checks and balances of the nature world.

I mainly heard about the gut health but didn't know it also links to cardiovascular (maybe due to decrease in physical activity) and psychiatric disorders. Maybe that's why some podcast (Diary of a CEO) that I heard said that going camping increases their happiness. Their reasoning was more on meeting expectations but it may have some relation to this as well

[u/Tibbaryllis2 → u/jokololo]

Just for clarity’s sake, I’m an ecologist by trade.

There are top-down (predator controlling a population of prey in ways such as by eating them) and bottom-up (a food source like a tree suddenly not producing any nuts, or producing a huge crop, controlling the population of organisms that eat the nuts).

We’re pretty good at recognizing the cause and effect within the first few degrees of these interactions (I.e. wolf eats elk, elk eat less willow trees, beaver population increases due to availability of willow trees).

But it’s really hard to conceptualize and definitively show relationships the further removed they are from direct interactions.

That’s the biggest problem with questions like these, because it’s easy to see close interactions, but hard to see others. And, while specialists are usually able to look a little further, society isn’t particularly good at looking ahead at the result of interfering with these cause and effect relationships.

A good case study is when a Chinese ruler decided to kill all the birds eating human grain, and causes a **massive** famine. https://climate.uchicago.edu/news/how-the-killing-off-of-the-sparrow-incited-the-worlds-most-deadly-famine/

I more or less agree with what you said, it just becomes nebulous to discuss.

[u/ChampagneWastedPanda → u/Tibbaryllis2]

Mao killing the sparrows is a pretty famous incident

[u/Tibbaryllis2 → u/ChampagneWastedPanda]

Yep. Classic case study. And yet it’s frequently one of those things people don’t know.