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Ant Overlords? Supercolony in Ethiopian Forests Set to Invade Globe

<em>Lepisiota</em> ants kill a termite.
<em>Lepisiota</em> ants kill a termite. (Image credit: D. Magdalena Sorger)

The forests of Ethiopia are teeming with a supercharged ant that is poised to invade the globe, new research suggests.

The infamous ant species, Lepisiota canescens, is demonstrating the behavior needed for supercolony formation and for global invasion — (insect world domination, anyone?), the researchers say.

"The species we found in Ethiopia may have a high potential of becoming a globally invasive species," study author D. Magdalena Sorger, a postdoctoral researcher at the North Carolina Museum of Natural Sciences, said in a statement. "Invasive species often travel with humans, so as tourism and global commerce to this region of Ethiopia continue to increase, so will the likelihood that the ants could hitch a ride, possibly in plant material or even in the luggage of tourists.

"All it takes is one pregnant queen," she added. "That's how fire ants started." [Gallery of Zombie Ants]

Typically, ants form coloniesmade up of one nest and ruled by one queen. But about 20 different ant species — think of them as the Romans or the Incas of the insect world — have their sights set on building an empire. These ants form so-called supercolonies comprising many nests with many queens. Supercolonies can contain billions of individuals that swarm out across the landscape and wipe out their ant neighbors. The Argentine ant, for instance, has a supercolony that spans most of California and is now expanding into Mexico, researchers previously told Live Science, while the biggest supercolony on the planet spans 3,700 miles (6,000 kilometers) across the Mediterranean, according to a 2009 article in the journal Insectes Sociaux

Sorger's team was surveying ant species in Ethiopia when they found that L. canescens was showing some of the hallmarks of supercolony formation — namely, an ability to expand without any constraints. A genetic analysis revealed that the different colonies contained genetically diverse members and that the species is native to the region.

D. Magdalena Sorger searches for ants in Ethiopia. (Image credit: Mark Moffett)

In Ethiopia, many of the churches are surrounded by forests in an otherwise forbidding landscape. The ants seemed to have a preference for these forests, the researchers said. In addition, L. canescens seemed to have an uncanny ability to cross from its preferred forest habitat to nearby farmlands, roads and buildings, the researchers reported in the current issue of the journal Insectes Sociaux.

The largest colony was still relatively modest in absolute terms, crossing an expanse of roughly 24 miles (38 km) in length, but this population is actually the largest supercolony documented in an ant species living in its native habitat, the researchers noted. Even stranger, its rapidly expanding population and aggressive expansionist behavior are more typical of invasive species, the researchers wrote in the journal article.

The findings suggest the possibility that these ants could become global hitchhikers that colonize other regions, the researchers wrote.

"It is good to have a record of what this species does in its native habitat," Sorger said. "Rarely do we know anything about the biology of a species before it becomes invasive."

Original article on Live Science.

Tia Ghose
Tia has interned at Science News,, and the Milwaukee Journal Sentinel and has written for the Center for Investigative Reporting, Scientific American, and ScienceNow. She has a master's degree in bioengineering from the University of Washington and a graduate certificate in science writing from the University of California Santa Cruz.