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Unformatted text preview: Eurasian mammals, however, had such wide geographic ranges (in the case of pigs extending for 13,000 km from Spain to China) that there was ample time for independent domestications at locations west and east of each other. In the New World, even though all the homelands of agriculture lay within only 4000 km of each other, the slowness of crop diffusion along the New World’s north–south axis meant that repeated independent domestications were frequent. So slow was that diffusion that the New World’s main animal domesticates — the llama and guinea pig of the Andes, and the turkey of Mexico — had
NATURE | VOL 418 | 8 AUGUST 2002 | www.nature.com/nature In several parts of the world, food production arose only upon the arrival of domesticates from the primary homelands, whereupon people proceeded to domesticate some local wild plants or animals that had not been domesticated previously9. Clear examples of such ‘secondary’ homelands, in which local domestication was triggered...
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- Fall '08