A study of woolly mammoths has added to evidence they were wiped out by climate change, scientists say.
British and Swedish researchers sequenced DNA from 88 samples of bone, tooth and tusk, looking for a signature in the genetic code handed down on the maternal line. They used this telltale sign to build a family tree of mammoths spanning 200,000 years.
A warm period 120,000 years ago caused populations to decline and become fragmented. Wrangel Island, in the Siberian Arctic, and the island of St Paul, off Alaska, are believed to have been the mammoths’ last refuge. Sydney Morning Herald, 12 Sep 2013 – screencopy held by this website