Evolution on a Frozen Continent
The content you've requested is available without charge only to active Sigma Xi members and American Scientist subscribers.
If you are an active member or an individual subscriber, please log in now in order to access this article.
If you are not a member or individual subscriber, you can:
Knowing how fast DNA changes over time gives biologists a “clock” for measuring evolution itself. One way to measure the speed of DNA change is to compare DNA from individuals of one species that lived at widely different times. Adelie penguins of Antarctica offer a unique laboratory for these experiments. Hundreds of generations return to the same rookeries to breed, and the voluminous remains resulting from the harsh conditions and severe predation are amazingly preserved in the cold, dry climate. The natural history of Adélie penguins, including colony movements over the past many thousands of years, gives a fascinating picture of life on a stark, dramatic continent. Precise aging of serially preserved ancient and modern penguin remains and careful analysis of coding and noncoding DNA of their mitochondrial and nuclear genome presents us with the evolutionary clock biologists seek.
Connect With Us:
An early peek at each new issue, with descriptions of feature articles, columns, and more. Every other issue contains links to everything in the latest issue's table of contents.News of book reviews published in American Scientist and around the web, as well as other noteworthy happenings in the world of science books.
To sign up for automatic emails of the American Scientist Update and Scientists' Nightstand issues, create an online profile, then sign up in the My AmSci area.
JSTOR, the online academic archive, contains complete back issues of American Scientist from 1913 (known then as the Sigma Xi Quarterly) through 2005.
The table of contents for each issue is freely available to all users; those with institutional access can read each complete issue.
View the full collection here.
Receive notification when new content is posted from the entire website, or choose from the customized feeds available.