Worker ants link bodies and buoyant broods to protect queen during flood.
When facing a flood, ants build rafts and use both the buoyancy of the brood and the recovery ability of workers to minimize injury or death, according to a study published in PLOS ONE on February 19, 2014 by Jessica Purcell from University of Lausanne, Switzerland, and colleagues. Furthermore, the queen ant is placed in the middle and protected on all sides by the rafting ants.
When put in harm’s way, social animals are often able to work together to enhance the survival and welfare of the group. Ants living on flood plains are known to link to together to create rafts during floods, but less is known about the composition, shape, and social structure, if any, of these rafts. To better understand this process, scientists collected ants from a flood plain in Switzerland and brought them back to the lab so they could induce flooding in ant populations containing different combinations of worker ants, queens, and broods (containing developing larvae and pupae). During the ‘flooding,’ they observed where the workers, brood, and queens were positioned in the raft. The flooding also allowed them to observe the buoyancy and recovery ability of the worker ants and brood.
Researchers found that the worker ants and brood were extremely resistant to submersion. The workers protected the most vulnerable and valuable nest mate, the queen, by placing her in the center of the raft, and the worker ants used the buoyancy of the brood at the base and recovery ability of workers to create a raft and minimize ant injury or death. Both workers and brood exhibited high survival rates after they rafted, which suggests that occupying the base of the raft is not as deadly as scientists expected. Placing the brood at the base of the raft may also aid in keeping the nest together during the flood.
Researchers have found that ants and termites could help us to find the hidden treasures such as gold in the Earth.
This research has been conducted by CSIRO and published online in the journals PLoS ONE and Geochemistry: Exploration, Environment, Analysis.
Researchers have worked on a test site in the West Australian goldfields termite mounds and found high concentrations of gold that could represent larger deposit underneath.
“We’re using insects to help find new gold and other mineral deposits. These resources are becoming increasingly hard to find because much of the Australian landscape is covered by a layer of eroded material that masks what’s going on deeper underground,” Dr Aaron Stewart, CSIRO entomologist said.
Researchers found that the termites and ants snug the places by digging in the material, where gold traces were found underlying and bring the traces to the surface.
“The insects bring up small particles that contain gold from the deposit’s fingerprint, or halo, and effectively stockpile it in their mounds,” Dr Stewart said.
“Our recent research has shown that small ant and termite mounds that may not look like much on the surface, are just as valuable in finding gold as the large African mounds are that stand several metres tall.”