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17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
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ScienceShot: Chinook Salmon Navigate by GPS
6 February 2014 12:15 pm
Despite having no life experience, young salmon in the Pacific Northwest somehow travel hundreds or thousands of kilometers from their native streams to feed and grow in the ocean. While they can use their sense of smell to get back home to spawn, Chinook salmon (Oncorhynchus tshawytscha) have an inborn sense of direction that functions like a GPS. Scientists now suspect that with no prior knowledge, they use Earth’s magnetic field to find the right ocean habitat. To make the discovery, researchers placed hatchery-raised juveniles inside a bucket and exposed them to artificially generated magnetic fields. When the angle and intensity of the field matched the southernmost part of their ocean range, the fish oriented themselves to face north or northeast. The magnetic field at the northernmost range caused them to point south or southwest. By orienting within these two extremes, the salmon can find the feeding grounds of their ancestors, the team reports today in Current Biology. Because sea turtles use a similar magnetic map, the researchers speculate that many migratory marine animals, such as eels, sharks, and seals, may also navigate using magnetic fields.