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Longitude Perception and Bicoordinate Magnetic Maps in Sea Turtles
The arena was surrounded by a computerized coil system (description below), which was used to control the magnetic field in which the turtles swam. each turtle began its trial in a magnetic field matching that found at the natal beach (inclination = 57.7°,intensity = 46.5 μT) and was allowed to establish a course toward a dim light (an LEAD …
The geomagnetic habitat in which sea turtle eggs incubate affects …
Keywords: magnetic field, magnetic orientation and navigation, magnetoreception, ontogeny, sea turtles, Caretta caretta. 1. Introduction.Diverse animals detect the Earth’s magnetic field and exploit it as a source of facts while migrating,homing or moving through their habitat [1,2]. Animals can derive at least two different types of …
PDF Sea Turtles: navigating with Magnetism – Cell Press
Young sea turtles use the Earth’s magnetic field as a source of … for sea turtle navigation was “an insult to science” [7].The honor of science was eventually redeemed when newly… disrupt magnetoreception, were placed on the heads of several control turtles. By contrast,all …
Researchers found that sea turtles can learn the magnetic signatures of specific geographical areas. This was demonstrated by observing turtles performing a “dance” when they knew they would get food. Even when tested four months later, the turtles still knew where they should dance.
No one knows exactly how animals tune into this magnetic information. One theory is that some can detect the magnetic field’s influence during a chemical reaction between light-sensitive molecules. Though, when the researchers tried to interfere with this process by using what is called radiofrequency fields, the turtles kept on dancing in their spot, undisturbed.
A separate experiment testing the turtles’ inner compasses was more triumphant. In a tank replicating the magnetic conditions of the West African archipelago Cape Verde, the radiofrequency emissions seemed to scramble the turtles’ compasses, sending them off in random directions. The researchers concluded that “a reasonable working hypothesis is that the compass sense relies on chemical magnetoreception, whereas the map sense relies on an alternative mechanism”.
This hypothesis is backed up by signs that other migratory animals, such as birds may also have dual magnetic field receptors.
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Editor:
In your recent study, you explored how sea turtles use the Earth’s magnetic field for navigation. Can you elaborate on this fascinating discovery?
Guest:
Certainly! We found that young sea turtles can learn the magnetic signatures of specific geographical areas. This was demonstrated by observing turtles performing a “dance” when they knew they would get food. Even when tested four months later, the turtles still knew where they should dance. This indicates that they have an inherent ability to use the magnetic field as a navigational tool.
Editor:
That’s truly remarkable. Could you explain how animals,particularly sea turtles,detect and interpret magnetic details?
Guest:
No one knows exactly how animals tune into this magnetic information. One theory is that some can detect the magnetic field’s influence during a chemical reaction between light-sensitive molecules. Though, when we tried to interfere with this process by using radiofrequency fields, the turtles kept on dancing in their spot, undisturbed.
Editor:
That’s intriguing. What about their inner compasses? How did you test them?
guest:
In a separate experiment, we tested the turtles’ inner compasses in a tank replicating the magnetic conditions of the West African archipelago Cape Verde. The radiofrequency emissions seemed to scramble the turtles’ compasses, sending them off in random directions. This suggests that their compass sense relies on chemical magnetoreception,whereas the map sense relies on an option mechanism.
Editor:
That’s a significant breakthrough. Do you think other migratory animals, like birds, might also have dual magnetic field receptors?
Guest:
yes, our hypothesis is backed up by signs that other migratory animals, such as birds, may also have dual magnetic field receptors. This could explain how they navigate over long distances with such precision.
Editor:
Thank you for sharing these insights. It’s amazing to see how nature has evolved such complex navigational systems.
Guest:
Indeed,it’s a fascinating field of study. We’re continually learning more about the complexities of animal behavior and their interaction with their habitat.
Editor:
Thank you for your time and for shedding light on this incredible phenomenon.