The genetic affinities that characterize Central Andean populations are highly consistent with the succession of expansive polities in the region, culminating with the Incas. In the environs of Lake Titicaca, however, one subset of the present day Aymara-speaking population exhibits a peculiar position: perhaps a genetic correlate to their original Uro linguistic lineage (now extinct in the area), tallying with ethnohistorical claims for the distinctiveness of the Uro population. Our results emphasize the need for genetic descriptions to consider the widespread phenomenon of language shift. Am. J. Hum. Biol., 2010. © 2010 Wiley-Liss, Inc.
То есть смена языка хотя бы иногда происходит как замещение оригинального населения.