The change in the water might, but it turns out that mosquitoes aren't a vital part of any ecosystem. Nothing preys on them exclusively or even primarily, and their animal victims seldom die, so they're not keeping anything's numbers in check.
Well, they do seem to keep human numbers in check to some degree.
I always understood that human numbers in less developed areas actually increase because other forces (disease, poverty, mosquitoes?) try to keep them in check.
Don't bats eat a healthy diet of mosquitoes?
They do, but it's a relatively small part of their diet. They do all right on other bugs.
Yeah, but male mosquitoes are pollinators, right?
They are, but the same thing applies--every plant that mosquitoes pollinate is also ably served by other species.