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English Audio Request

felixanta
438 Words / 1 Recordings / 0 Comments

Eradicating any organism would have serious consequences for ecosystems — wouldn't it?
Every day, Jittawadee Murphy unlocks a hot, padlocked room at the Walter Reed Army Institute of Research in Silver Spring, Maryland, to a swarm of malaria-carrying mosquitoes (Anopheles stephensi). She gives millions of larvae a diet of ground-up fish food, and offers the gravid females blood to suck from the bellies of unconscious mice — they drain 24 of the rodents a month. Murphy has been studying mosquitoes for 20 years, working on ways to limit the spread of the parasites they carry. Still, she says, she would rather they were wiped off the Earth.
That sentiment is widely shared. Malaria infects some 247 million people worldwide each year, and kills nearly one million. Mosquitoes cause a huge further medical and financial burden by spreading yellow fever, dengue fever, Japanese encephalitis, Rift Valley fever, Chikungunya virus and West Nile virus. Then there's the pest factor: they form swarms thick enough to asphyxiate caribou in Alaska and now, as their numbers reach a seasonal peak, their proboscises are plunged into human flesh across the Northern Hemisphere.
So what would happen if there were none? Would anyone or anything miss them? Nature put this question to scientists who explore aspects of mosquito biology and ecology, and unearthed some surprising answers.
There are 3,500 named species of mosquito, of which only a couple of hundred bite or bother humans. They live on almost every continent and habitat, and serve important functions in numerous ecosystems. "Mosquitoes have been on Earth for more than 100 million years," says Murphy, "and they have co-evolved with so many species along the way." Wiping out a species of mosquito could leave a predator without prey, or a plant without a pollinator. And exploring a world without mosquitoes is more than an exercise in imagination: intense efforts are under way to develop methods that might rid the world of the most pernicious, disease-carrying species (see 'War against the winged').
Yet in many cases, scientists acknowledge that the ecological scar left by a missing mosquito would heal quickly as the niche was filled by other organisms. Life would continue as before — or even better. When it comes to the major disease vectors, "it's difficult to see what the downside would be to removal, except for collateral damage", says insect ecologist Steven Juliano, of Illinois State University in Normal. A world without mosquitoes would be "more secure for us", says medical entomologist Carlos Brisola Marcondes from the Federal University of Santa Catarina in Brazil. "The elimination of Anopheles would be very significant for mankind."
Arctic pests

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  • A world without mosquitoes, Nature Washington DC, part 1 ( recorded by mlin ), American (neutral)

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