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SHARKS HAVE TO SWIM

Some species of sharks can make mental maps of their regular habitat, allowing them locate targets up to 50 miles away.

U.S. scientists came to this conclusion after analyzing data from tiger sharks (Galeocerdo cuvier) that we had placed acoustic transmitters and found that they always take paths Direct side to side.

The researchers note that this behavior shows a great ability to record mental maps of key sites.

Scientists say this is further evidence that sharks can sail guided by the Earth's magnetic field.

The study was published in the Journal of Animal Ecology (Journal of Animal Ecology.)

Previous research had shown in Hawaii deep sea tiger sharks targeting shallower, nutrient rich located about 50 miles.

Research shows that tiger sharks and whipping not swim at random but are directed specific points.

Statistics show that these routes were not accidental but followed a set pattern.

However, other species, like blacktip sharks (Carcharhinus melanopterus), showed this behavior. Moreover, the so-called spanker or fox shark ocean (Alopias vulpinus) showed a similar pattern of tigers, but on a smaller scale.

"Research shows that tiger sharks and whipping not swim at random, but that target specific points," said Yannis Papastamatiou, who led the team of the National History Museum of Florida who led the study.

"Simply put, they know where they go," he said.

Maps and magnetic fields

Sharks are part of a series of animals that can sense the Earth's magnetic field.

The study demonstrated that whipping does not record shark behavior.

But while yellowfin tuna makes using small amounts of magnetite stored in your head, sharks do not have deposits of this mineral in your body.

Another possibility, scientists say, is that they use signals of ocean currents, water temperature or are guided by smell.
"These sharks must have a very good navigation system for navigating the distances are enormous, "said Papastamatiou.

" Which system used is a matter of debate, but the fact that many of these tours take place at night reinforces the idea that are guided by the magnetic field, "said the researcher.

Lashers

Among sharks, adults walk longer distances than younger ones. This shows that develop their ability to construct mental maps as they mature.

Differences species can be explained by various forms of life.

Although black tip sharks are common throughout the Pacific, usually stocks move in a more limited range.

However, tiger sharks can cover distances of up to 3,000 kilometers.

Source: BBC World