When mosquitoes do matter is during their larval phase, where they serve as food for minnows, tadpoles, dragonfly larvae, and much more. Controlling them can have an effect; one study out of Europe found, for example, that newt populations were affected by the treatment because they depended on midges for food, which in turn depended on mosquito larvae. But considering how Edmonton had been using the bacterial treatment since the 1980s, there should have been local data to support the hypothesis of local food chain collapse if it was indeed happening.
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