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:
Both tunas and lamnid sharks, including makos and whites, are top
predators and have similar streamlined body shapes. And the
similarity between these fishes, it turns out, is more than skin
deep. The two groups have developed high-speed swimming techniques
that involve efficient movements of only their tail sections, rather
than the full-body undulations of most fish. They accomplish this by
keeping their red muscle in their torsos and transferring the muscle
force to the tail through large, specialized tendons. While the two
groups' common ancestor diverged more than 400 million years ago,
selection pressures seem to have made both fish hit upon nearly
identical movement mechanisms.
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.