for National Geographic News
A 46-year-old man entombed by a glacier about 5,200 years ago high in the mountains that border Austria and Italy probably spent his entire life within a 37-mile (60-kilometer) range south of where he came to his final rest, according to a new study.
Two German hikers found the "Iceman," also known as Ötzi, in the Ötzal Alps on September 19, 1991. He is heralded as the world's oldest and best preserved mummy. Since the Iceman discovery, scientists have labored to piece together his life history.
Who was he? How did he die? Where did he live?
Previous research suggests Ötzi was shot in the back by an arrow during a violent scuffle with at least two other people. The wound ultimately killed him, but not before he was able to scurry up the mountain in a futile attempt at escape.
While this theory has gained traction among the research communityit is supported by DNA analysis of the clothing, knives, bows, and arrows preserved in the ice with Ötziuntil now, the question of his origins and life-long travel patterns remained cloaked in mystery.
Wolfgang Müller, an Earth scientist with the Australian National University in Canberra, and colleagues compared the isotopic composition of a variety of elements, such as oxygen, strontium, and lead, found in the Iceman's teeth, bones, and stomach with isotopes in the soils and waters of the region to infer where he lived at various stages in his life.
"Single isotopic tracers have been used for quite a while in isolation. Their result is often equivocal. Only very recentlyand our work is the first to utilize this array of methodsseveral isotopic tracers have been combined to get more precise information," said Müller.
The research, reported in the October 31 issue of the journal Science, restricts Ötzi's birth place to a few valleys on the Italian side of border with Austria and suggests he never strayed more than a few days' walk from home.
Thomas Loy of the School of Social Science at the University of Queensland in Australia, who performed the DNA analysis that suggested Ötzi died after a violent scuffle, said the data from Müller and colleagues were "compelling."
"Knowing where he more than likely grew up, and the limited travel he undertook as an adult, places him in a specific territory," said Loy. "And if the territory is known, then aspects of his life can be reconstructed."
The detective work of Müller and colleagues relied on two important factors: knowing when certain trace elements are locked into which part of the human body and knowing where such elements are found in the environment.
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