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6 March 2014 1:04 pm ,
Vol. 343 ,
Magdalena Koziol, a former postdoc at Yale University, was the victim of scientific sabotage. Now, she is suing the...
Antiretroviral drugs can protect people from becoming infected by HIV. But so-called pre-exposure prophylaxis, or PrEP...
Two studies show that eating a diet low in protein and high in carbohydrates is linked to a longer, healthier life, and...
Considered an icon of conservation science, researchers at World Wildlife Fund (WWF) headquarters in Washington, D.C.,...
The new atlas, which shows the distribution of important trace metals and other substances, is the first product of...
Early in April, the first of a fleet of environmental monitoring satellites will lift off from Europe's spaceport in...
Since 2000, U.S. government health research agencies have spent almost $1 billion on an effort to churn out thousands...
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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.