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Sharks Use Earth’s Magnetic Field for Homeward Orientation 5nvklj





Sharks Use Earth’s Magnetic Field for Homeward Orientation 9tpt39

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Sharks Use Earth’s Magnetic Field for Homeward Orientation

Dragon
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Sharks Use Earth’s Magnetic Field for Homeward Orientation Empty Sharks Use Earth’s Magnetic Field for Homeward Orientation

Post by Dragon Sun May 23, 2021 4:35 am

Migration is common in marine animals and use of the map-like information of Earth’s magnetic field appears to play an important role.

While sharks are iconic migrants and well known for their sensitivity to electromagnetic fields, whether this ability is used for navigation was unresolved.

“Our research supports the theory that they use the Earth’s magnetic field to help them find their way.

It’s nature’s GPS,” said study’s lead author Dr. Bryan Keller, a researcher in the Florida State University Coastal and Marine Laboratory.

“Bonnetheads return to the same estuaries each year.

This demonstrates that the sharks knows where ‘home’ is and can navigate back to it from a distant location,” he added.


Source


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Sharks Use Earth’s Magnetic Field for Homeward Orientation 334pu7m
Dragon
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Post by Dragon Sun May 23, 2021 4:37 am

Sharks Use Earth’s Magnetic Field for Homeward Orientation Image_9637-Sphyrna-tiburo
Image credit: Tony Hisgett / CC BY 2.0.

The bonnethead (Sphyrna tiburo).

“How cool is it that a shark can swim 20,000 km round trip in a three-dimensional ocean and get back to the same site?” Dr. Keller said.


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Sharks Use Earth’s Magnetic Field for Homeward Orientation 334pu7m
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Post by Dragon Sun May 23, 2021 4:39 am



Electroreception in Sharks

A bonnethead shark biting actively and vigorously at various electric dipoles while ignoring the live fish swimming around with it.


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Sharks Use Earth’s Magnetic Field for Homeward Orientation 334pu7m
Dragon
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Sharks Use Earth’s Magnetic Field for Homeward Orientation Empty Re: Sharks Use Earth’s Magnetic Field for Homeward Orientation

Post by Dragon Sun May 23, 2021 4:40 am



Shark Electroreception Demonstration


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Sharks Use Earth’s Magnetic Field for Homeward Orientation 334pu7m
Dragon
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Sharks Use Earth’s Magnetic Field for Homeward Orientation Empty Re: Sharks Use Earth’s Magnetic Field for Homeward Orientation

Post by Dragon Sun May 23, 2021 4:43 am



Map-Like Use of Earth’s Magnetic Field in Bonnethead Sharks

This ability of bonnetheads (Sphyrna tiburo) is useful for navigation and possibly maintaining population structure.


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Sharks Use Earth’s Magnetic Field for Homeward Orientation 334pu7m

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