Nature wades into the controversy, asking scientists what would really happen if we killed all the mosquitoes:
A stronger argument for keeping mosquitoes might be found if they provide ‘ecosystem services’ — the benefits that humans derive from nature. Evolutionary ecologist Dina Fonseca at Rutgers University in New Brunswick, New Jersey, points as a comparison to the biting midges of the family Ceratopogonidae, sometimes known as no-see-ums. “People being bitten by no-see-ums or being infected through them with viruses, protozoa and filarial worms would love to eradicate them,” she says. But because some ceratopogonids are pollinators of tropical crops such as cacao, “that would result in a world without chocolate”.
Without mosquitoes, thousands of plant species would lose a group of pollinators. Adults depend on nectar for energy (only females of some species need a meal of blood to get the proteins necessary to lay eggs). Yet McAllister says that their pollination isn’t crucial for crops on which humans depend. “If there was a benefit to having them around, we would have found a way to exploit them,” she says. “We haven’t wanted anything from mosquitoes except for them to go away.”
Ultimately, there seem to be few things that mosquitoes do that other organisms can’t do just as well — except perhaps for one. They are lethally efficient at sucking blood from one individual and mainlining it into another, providing an ideal route for the spread of pathogenic microbes.
“The ecological effect of eliminating harmful mosquitoes is that you have more people. That’s the consequence,” says Strickman.