A model presented/displayed today in Mexico by the Argentine scientist Jose Luis Lanata explains the entrance and expansion of the man in America from the Straits of Bering, for 18,000 years, to its arrival to the Patagonia has been doing 9.000.
This hypothesis contradicts some recent theories formulated by the investigators, who put in doubt that the Straits that separates Alaska (EE.UU.) of Kamchatka (Russia) would be the unique one via of entrance of “homo sapiens” in the continent.
Those specialists base their argumentation on the fact that the found oldest bones until today in America have a considered age of 12,700 years and have appeared in Mexico, not in Canada or the United States, as well as in the finding of bony rest of European connection in deposits of North America.
Lanata and its equipment of the Maimónides University of Buenos Aires have made a mathematical model that the existence takes into account from 18 ecosystems different in the continent in lapses from thousand years, as well as human factors like the rate of natality and the access to nourishing resources.
With this model, the equipment headed by Lanata made projections to draw up to the map of the expansion of the man in America using different rates from population growth.
Its conclusion was that to reach the Patagonia 9,000 years ago, when the archaeologists consider that the arrival of the man to the zone took place, the rate of population growth of the first Americans had to be of the three or the four percent.
This number, explained Lanata, “is highest” we compared if it with the index of population growth of societies of hunting collectors, next to the one percent.
“With a normal growth of 1% or the 1.5%” man would have been extinguished in the area of the Straits of Bering and he could not have occupied America, stressed.
Nevertheless, in its opinion, in the case of America the high growth of the population occurred because the man happened of cold zones to temperate or warm zones, conditions in which the human species grows more quickly, unlike which happened in “the Old World”.
Another one of the arguments that Lanata used to defend its model is that a rate of growth of the three or four percent would be the necessary minimum for the formation of the 4.5 haplogrupos (populations with a common genetic predecessor) that they exist in the continent.
Jose Luis Lanata is director of the Department of Natural Sciences and Anthropological from the Maimónides University of Buenos Aires and in 2007 he received the Prize Simon Bolivar of Latin American studies of the University of Cambridge.

- [Original Source]

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