Logo IMG
HOME > My Amsci > Restricted Access

Restricted Access 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:


Polylepis tarapacanaClick to Enlarge Image

In the high Andes of Bolivia sits an unexpected sight: patches of otherworldly trees and bushes adapted to live in the harsh conditions found more than 4,000 meters above sea level. Polylepis forests are unique ecosystems harboring about 20 different plant species of what the locals call queñua, as well as numerous insect and bird specialists living only in these forests. Once thought to be patchy by nature, Polylepis forests are now recognized to be highly endangered. Exploited since Incan times, the forests now occupy only about 1 percent of their original area in the eastern Bolivian Andes and about 3 percent in Peru. The authors describe the value of the Polylepis ecosystem and the challenges conservationists face in preserving what remains.

Connect With Us:


Subscribe to Free eNewsletters!

Read Past Issues on JSTOR

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.

RSS Feed Subscription

Receive notification when new content is posted from the entire website, or choose from the customized feeds available.

Write for American Scientist

Review our submission guidelines.

Subscribe to American Scientist