Aug 19, 2010

Fossil Reveals 48-Million-Year History of Zombie Ants


“A 48-million-year-old fossilised leaf has revealed the oldest known evidence of a macabre part of nature — parasites taking control of their hosts to turn them into zombies. The discovery has been made by a research team led by Dr David P Hughes, from the University of Exeter, who studies parasites that can take over the minds of their hosts.

All manner of animals are susceptible to the often deadly body invasion, but scientists have been trying to track down when and where such parasites evolved.
Dr Hughes, from the University’s School of Biosciences, said: “There are various techniques, called a molecular clock approach, which we can use to estimate where and when they developed and fossils are an important source of information to calibrate such clocks. “This leaf shows clear signs of one well documented form of zombie-parasite, a fungus which infects ants and then manipulates their behaviour.”

The fungus, called Ophiocordyceps unilateralis, causes ants to leave their colonies and head for a leaf which provides the ideal conditions for the host to reproduce.
When it gets there the ant goes into a ‘death grip’- biting down very hard on the major vein of a leaf. This means that when the ant dies, its body stays put so the fungus has time to grow and release its spores to infect other ants.”

Read more at Science Daily

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