Image: Courtesy of ADRIAN LISTER |
Examine any depiction of Ice Age life and you're likely to find at least one¿a woolly mammoth, that is. But popular appeal notwithstanding, the evolutionary history of this prehistoric beast has proved somewhat difficult to pin down. To that end, findings published today in the journal Science provide some much needed insight.
Working from an extensive Eurasian fossil record going back some 2.6 million years, Adrian Lister of University College London and Andrei V. Sher of the Russian Academy of Sciences in Moscow studied changes in the skulls and teeth of three successive mammoth species (the last of which was the woolly variety) over time. The researchers documented long stretches of gradual change in all three species, with different features changing at different times. Intriguingly, however, the advanced features¿a number of which represent adaptations to grazing¿seem to have emerged first in Siberia and only later spread to Europe.
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Lister and Sher note that Siberia experienced periglacial conditions earlier, more intensely and for a longer duration than did Europe. "Siberia thereby provided a continuing source of grazing-adapted mammoths, which we suggest acted as a repeated source of evolutionary advancement into periodically glaciated Europe," they write. The authors further report that the origins of the mammoth species are not particularly clear-cut. Thus, they may represent populations whose evolutionary paths never fully diverged.