And don't say humans, too obvious, too cynical.
I'd delete mosquitos.
The only negative effect I can think of would be fish won't have mosquito larvae to eat and their diet would have to shift.
And don't say humans, too obvious, too cynical.
I'd delete mosquitos.
The only negative effect I can think of would be fish won't have mosquito larvae to eat and their diet would have to shift.
Deleting all mosquitoes would have a significant impact on the environment, many birds and spiders mainly prey on them. Delete just mosquitoes that bite humans. It's a much narrower range and wouldn't affect the environment as much.
Similar insects would quickly fill the niche.