Dragonflies are pretty ferocious predators of mosquitos where they coexist, and I think I remember reading that dragonfly larvae also prey on mosquito nymphs, a

Dragonflies are pretty ferocious predators of mosquitos where they coexist, and I think I remember reading that dragonfly larvae also prey on mosquito nymphs, although don't quote me on that until I find a cite. A layer further up, many birds include dragonflies in their diet. And a layer further down, fewer dragonflies means more of everything else they prey on, too.