The Ice Age was harsh on orcas

The Ice Age was harsh on orcas

By Sarah Zielinski, 14:22 PM February 11, 2014

Most orca populations declined during the Ice Age, and this bottleneck is recorded in their DNA. But at least one population, off the coast of South Africa, was apparently unaffected.

Organisms hold a record of their species’ history in their DNA. By analyzing small differences in the genetic sequences of individuals within a species, scientists can determine how populations might have mixed or become isolated, grown or declined over time.

Andre Moura of Durham University in England and colleag...

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