Deadly Fungus Turns Ants Into Zombies
A new type of parasitic fungus takes control of ant by burrowing in their brains.
- Four new species of fungi that turn ants into zombies have been discovered in the Amazon.
- Ants become infected when they come into contact with spores released by the fungus. Within a week the ant enters a "zombie-like" state.
- The fungus then grows out of the head of the ant, releasing spores into the air.
Researchers combing the rainforests of Brazil have uncovered four new species of fungi that turns ants into zombies.
Although it is not the first time the fungi has been seen affecting ants, the discovery of four distinct species in close proximity highlights the level of biodiversity in the Amazon.
Their study appears online in the journal PLoS One.
The research, led by Assistant Professor David Hughes of the University of Pennsylvannia, identified and described the parasitic fungus Ophiocordyceps unliateralis living on four species of carpenter ant (Camponotini sp.) in the Zona da Mata region of Brazil.
Ants become infected when they come into contact with spores released by the fungus. Within a week the ant enters a "zombie-like" state.
"This so-called zombie or brain-manipulating fungus alters the behaviors of the ant host, causing it to die in an exposed position, typically clinging onto and biting the adaxial surface of shrub leaves," the study authors write.
The fungus then grows out of the head of the ant, releasing spores into the air, which rain down onto unsuspecting ants and the forest floor.
In 2009, Hughes led a team of researchers studying "zombie-ants" in Indonesia. They found the infected ants consistently attached to leaves 25 centimeters (9.8 inches) above the ground in an environment with 95 percent humidity -- perfect conditions for the fungus to grow.
In the current study, Hughes and colleagues found each species of fungus was different in size and shape, and adapted to live only in one particular species.
Two of the species of fungus have also adapted to grow secondary spores, doubling their chances of finding a new host.
Steve Shattuck, an entomologist with CSIRO Ecosystem Sciences says there are records of the fungus existing in Australia, but its range is limited to tropical regions of Australia.
"It's hard to find. Exactly how common it is, who knows? But obviously if it was too common it would kill all the ants and then go away," says Shattuck.
He says, while there are many examples of ants living in symbiotic relationships with other organisms such as bacteria and other types of fungi, none are as invasive as Ophiocordyceps.
And despite the fungus' ability at destroying a whole colony of ants, Shattuck says its potential for use in pest control is very limited.
"What the paper found was that the fungi were species specific," he says. "So unless one of ants was your pest it doesn't do you any good."
It also means the possibility that the fungi will turn our 2000-odd species of Australian ant into a zombie army is highly remote.
"It would be very unlikely," says Shattuck. "If the fungi did get here it wouldn't have anything to live on and would just die out in all likelihood."
According to Hughes' website, his team plan to study the zombie-inducing fungus in Colombia, Guyana, Brazil, Peru, Malaysia, Papua New Guinea and Australia.
An ant has succumbed to the deadly fungus in this photo.
Entomologist Steven Kutcher is a Hollywood "Bug Guy," serving as a consultant in movies like "Jurassic Park," "Arachnophobia" and "James and the Giant Peach."
In the 1980s Director Steven Spielberg needed a shot where a fly walks through ink, leaving footprints.
Kutcher (above) began experimenting for the scene, which led to his interest in prints created by insects.
Now he has a whole gallery of the work, which you can see a sample of in the following slides. His complete gallery can be found at http://bugartbysteven.com/gallery.htm.
Black widow on canvas
Hissing Cockroach (Gromphadorhina portentosa)
Darkling Beetle (Eleodes sp.)
Grasshopper (Orthoptera, Suborder Caelifera)
Butterfly Feet and Wings
Sunrise No. 1 (Darkling Beetle)
Darkling Beetle on card
Beetle (stink bug) on canvas
Starry Night (Hissing Cockroach)