The life story of the mosquito.

News and commentary about environmental issues.
Aug. 26 2010 6:51 AM

A Hypodermic Needle With Wings

The story of the mosquito.

More revolting creatures: the eel, the skunk, the snapping turtle, the vulture, the tick, the jellyfish, the hyena and the slug.

(Continued from Page 1)

Then, as now, mosquitoes developed in standing water. And all too quickly: The blood-sucking insect can grow from an egg to an adult in just five days—and the eggs are plentiful. The malaria mosquito lays several hundred of them, one by one; other species drop rafts at a time. Their nursery-cum-swimming-pool can be as small as a discarded paper cup or a jar top, and it can be very polluted—pure sewage will do. A bristly mosquito larva, about 8 millimeters long, resembles an aquatic wirehaired dachshund or, if you prefer, a hairy maggot. Its head hangs down with its body suspended from the water surface by a breathing tube. As the snorkel takes in air, brushes filter the water for protozoans and bacteria.

A New Zealand mosquito has a mating habit that is the very definition of rapacious. Once the larvae have developed into comma-shaped pupae, adult males start to hang around, waiting for new females to hatch. As soon as one emerges, a male pushes in beside her and mates before her wings are dry enough to help her escape. A more common, and more voluntary, mosquito mating ritual has the males gathering in a cloud. The females choose to fly into the party.

Our living allies in mosquito control are primarily the fish that eat the larvae stage. Here we can give thanks for piranhas and the aptly named Western Mosquitofish. Dragonfly larvae eat mosquito larvae and dragonfly adults eat mosquito adults. Bats, for their part, have gotten more good press than they deserve. It turns out mosquitoes constitute less than 1 percent of the bat diet. Same goes for the purple martin, though these lovely swallows are nice to have around.

Advertisement

Even if it were possible for bats, birds, and pesticides to eradicate them all—which it isn't—wholesale mosquito slaughter would not be a great idea. Their huge numbers of larvae feed small fish, and those small fish feed big fish, and those big fish are the primary source of protein for much of the developing world.

Naturally, we take an anthropocentric view of mosquitoes. They matter because they are Man's Deadliest Foes. Maybe it's worth thinking of life from the insect's point of view. It's no picnic being a female mosquito, for the three to six weeks she lives on this earth. Drinking blood isn't easy; the longer the little phlebotomist has to poke for a blood vessel, the greater her chance of getting squashed. And after all, she didn't choose to carry all those deadly parasites. Where does she pick them up? From us.

We've spent the past 50 years trying to find a malaria vaccine for humans, so we don't give malaria to mosquitoes or contract it from them. It may make more sense to help the bugs out instead. We've recently sequenced the genomes of two of the most dangerous kinds of mosquitoes. Instead of using this knowledge to wipe them out more efficiently, what if we used it to strengthen their immune systems? We could live with the welt and the itch as long as we knew we weren't going to get the fevers.

Like Slate on Facebook. Follow us on Twitter.

Constance Casey is a former New York City Department of Parks gardener and writes the monthly "Species" column for Landscape Architecture Magazine.

TODAY IN SLATE

Politics

Smash and Grab

Will competitive Senate contests in Kansas and South Dakota lead to more late-breaking races in future elections?

Stop Panicking. America Is Now in Very Good Shape to Respond to the Ebola Crisis.

The 2014 Kansas City Royals Show the Value of Building a Mediocre Baseball Team

The GOP Won’t Win Any Black Votes With Its New “Willie Horton” Ad

Sleater-Kinney Was Once America’s Best Rock Band

Can it be again?

Technocracy

Forget Oculus Rift

This $25 cardboard box turns your phone into an incredibly fun virtual reality experience.

I Am 25. I Don’t Work at Facebook. My Doctors Want Me to Freeze My Eggs.

These Companies in Japan Are More Than 1,000 Years Old

  News & Politics
Politics
Oct. 20 2014 8:14 PM You Should Be Optimistic About Ebola Don’t panic. Here are all the signs that the U.S. is containing the disease.
  Business
Moneybox
Oct. 20 2014 7:23 PM Chipotle’s Magical Burrito Empire Keeps Growing, Might Be Slowing
  Life
Dear Prudence
Oct. 21 2014 9:18 AM Oh, Boy Prudie counsels a letter writer whose sister dresses her 4-year-old son in pink tutus.
  Double X
The XX Factor
Oct. 20 2014 6:17 PM I Am 25. I Don't Work at Facebook. My Doctors Want Me to Freeze My Eggs.
  Slate Plus
Tv Club
Oct. 20 2014 7:15 AM The Slate Doctor Who Podcast: Episode 9 A spoiler-filled discussion of "Flatline."
  Arts
Brow Beat
Oct. 21 2014 10:41 AM Taylor Swift Just Went to No. 1 on iTunes Canada With 8 Seconds of Static 
  Technology
Future Tense
Oct. 21 2014 10:43 AM Social Networking Didn’t Start at Harvard It really began at a girls’ reform school.
  Health & Science
Bad Astronomy
Oct. 21 2014 7:00 AM Watch the Moon Eat the Sun: The Partial Solar Eclipse on Thursday, Oct. 23
  Sports
Sports Nut
Oct. 20 2014 5:09 PM Keepaway, on Three. Ready—Break! On his record-breaking touchdown pass, Peyton Manning couldn’t even leave the celebration to chance.