In an ironic twist, the weaponry of the fire ants that have invaded the American South is also their potential downfall. Entomologists have found that the fire ants’ venom contains chemical compounds that attract their natural foes, the parasitic phorid flies that turn ants into zombies before decapitating them.
The invasive red fire ants first came from South America by boat, and from their original disembarkation point in Mobile, Alabama, they have spread across the South, from Texas to Maryland. Their painful stings and their habit of shorting out electrical equipment make them a serious pest to humans, and biologists have been attempting to control their numbers by importing and distributing the parasitic phorid flies. But until now, researchers didn’t know how the flies homed in on the ants. So researcher Henry Fadamiro hooked electrodes up to the antennae of flies to investigate which of several stimuli prompted nerves to fire. By exposing the antennae to extracts from different ant glands and body parts, the researchers determined that juice from the venom glands got antennae buzzing [Science News].
The study, published in the journal Naturwissenschaften, could help researchers determine where populations of the flies have taken hold in the United States by giving them the ability to make fly traps with the attractive chemicals.
While the phorid flies aren’t thought to go after native insect species, they target the fire ants in a truly terrifying way. An adult fly lays its egg in an ant’s body, and the larva then migrates to the ant’s head and devours its brain from the inside. For several weeks the ant wanders aimlessly, until the larva is ready to pupate and begins to secrete enzymes that decapitate the ant. Scientists aren’t sure why the flies bother to cut off the head. It may serve as an escape pod from residual toxins in the near-empty body [Science News].
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Image: USDA / Scott Bauer
September 22nd, 2009 at 4:51 pm
Is there a similar phorid fly for creationists?
Oh, sorry, that wouldn’t work. The flies eat brains.
September 23rd, 2009 at 11:54 am
Ouch, bigjohn, do I sense a bit of bitterness and maybe a touch of insecurity? I mean, this story has nothing to do with creationism vs. evolution, yet you pop off with that. Do you stare all day long at your computer screen fuming in an egotistical rage just because other people, including many who are fascinated by science and all it’s incredible wonders and intricate workings, believe in something greater than themselves, and everything from a piece about parasitic ant-killers to an episode of Spongebob Squarepants sets off a verbal spar aimed at “the enemy”? C’mon, pard’ner, buck up a little, it’s going to be ok. All those people singing in church on Sunday morning aren’t going to bother you (unless you live right next door to a church and your window is stuck open). Maybe go out and get some fresh air, take a break from your vigil. I guarantee you that other atheists are at the lake today or maybe watching a basball game – why, there’s probably one in the stands right now sharing his nachos with ***gasp*** a Christian in the seat next to him!! I bet brother Darwin himself would want you to take a breather. I bet he even got up from his studies and smiled at another human being just out of kindness every once in awhile. Why so angry, so vile? I don’t want to delve too deep, but maybe you should ask yourself why.
But I guess since you brought it up, it is amazing that a creature can and does do this to survive, home in on the poison of a pest and lay it’s eggs inside the body and it’s hatching young, controlling the ant like a zombie, then decapitate the head so that they can then escape the carcass. Hard to imagine something like that could just “happen”, even given enough time for all the parts to miraculously come together (oops, did I say “miraculously”? Is that a banned word on this website?). I like that extra explanation of why the fly larvae might decapitate the head, in order to protect themselves from toxins that may be in the trunk of the ant’s body. Incredible how evolution thought of that extra provision.
September 23rd, 2009 at 4:41 pm
Who are “the creator” that creates a creature that pierces it’s host, eats its way to the brain of the host, manipulates the host to a zombielike behavior and then finaly decapitates it.
If that is what you are suggesting Jim, then that is – sick humor.
September 23rd, 2009 at 6:09 pm
@ previous posters: dumb, da-dumb dumb dumb!
Quite an amazing adaptation, though.
September 24th, 2009 at 1:25 pm
I think if the God exists then the horrible ways of killing in the animal world would mean
“the all loving God” image created in Christianity is wrong also.
Maybe God exists but does not really like us much as we tend to assume so easily! :-)
October 30th, 2009 at 5:53 pm
Come on people this article is about nature at it’s best! There is nothing in it indicating God and creation. Animals survive anyway they can. This particular fly has an attraction to the fire ant. This way of living isn’t any crazier than a cheetach tripping it’s prey in order to eat or fungus taking over a tree’s moisture in order to grow and thrive. Nature works in it’s own way without assistance from mankind. If our creator made this particular fly then he also assisted it’s way of living. Appreciate whats around you and how it all ties together.