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In addition geneticists, while studying mitochondrial DNA in modern Europeans, have suggested that there is a large Palaeolithic component in modern Europeans. Thus because the Y chromosome is inherited strictly along the paternal line and mtDNA is inherited maternally, it may be the case that small groups of Neolithic men intermarried with indigenous women. An ancient DNA study appears to support this in that a particular mtDNA haplotype n1a found in early Neolithic female skeletons is comparatively rare among modern Europeans (Bentley 2007). LBK farming, rather than arriving as a wave of advance, is thought to have leap froged from the North East to the Mediterranean. Theories surrounding the movement of LBK farmers tend to suggest that they could move an entire village society 20km or 30 km in a decade but that it would take foragers much longer than this. Foragers are thought to have been mobile over larger territories, for them a distance of 50km may be considered as one journey between one foraging group to the next, but they would encounter many more settled farmers along the way (Robb and Miracle, 2007). It has been proposed that the spread of farming increased local population densities, causing demic expansion into new territory and diffusive gene flow between the Neolithic farmers and Mesolithic groups (Sokal, 1991). It is likely that different regions must have experienced different blends of cultural exchanges and migratory movements. Researchers have the ability to test the effect of factors such as, prehistoric population sizes, rates of gene flow, and mutation rates, on the likelihood of different scenarios. In the near future, they will also allow users to integrate information from the growing body of ancient genetic diversity, in addition to the broad modern data sets (Cavalli-Sforza and Feldman 2003). Demographic growth in the well identified, specific areas of origin of agriculture must have stimulated a continuous peripheral population expansion wherever the new technologies were successful. 'Demic expansion' is the name given to the phenomenon (that is, farming spread by farmers themselves) as contrasted with 'cultural diffusion' (that is, the spread of farming technique without movement of people). Innovations favouring demographic growth would be expected to determine both demic and cultural diffusion. Recent research suggests a roughly equal importance of demic and cultural diffusion of agriculture from the Near East into Europe in the Neolithic period. |
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2015/06/18
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