Penguins are Fast Evolvers

Seed magazine reports that researchers studying microevolutionary changes in the DNA of penguins are surprised as how quickly the birds have evolved.

In the study, published in the November 15th issue of the Proceedings of the National Academy of Sciences, scientists concluded that not only has evolution among the penguins during the past 6,000 years been MUCH faster than anyone thought, its unlikely that natural selection was the driving force. It’s much more likely that the rapid changes were driven by environmental changes which disrupted migration patterns.

Sounds like an interesting hypothesis to me (*shrug*). What I’d like to know however is HOW changes in migration patterns resulted in DNA changes? Sounds like we’re missing a few links here (no pun intended).