press release<\/a> provides more:<\/p>\nBecause experimental evidence in this regard has been lacking, Kremers and her colleagues set out to study the behavior of six bottlenose dolphins in the delphinarium of Plan\u00e8te Sauvage in Port-Saint-P\u00e8re. This outdoor facility consists of four pools, covering 2,000 m\u00b2 of water surface. They watched the animals’ spontaneous reaction to a barrel containing a strongly magnetized block or a demagnetized one. Except from this characteristic, the blocks were identical in form and density. The barrels were therefore indistinguishable as far as echolocation was concerned, the method by which dolphins locate objects by bouncing sound waves off them.<\/p>\n
During the experimental sessions, the animals were free to swim in and out of the pool where the barrel was installed. All six dolphins were studied simultaneously, while all group members were free to interact at any time with the barrel during a given session. The person who was assigned the job to place the barrels in the pools did not know whether it was magnetized or not. This was also true for the person who analyzed the videos showing how the various dolphins reacted to the barrels.<\/p>\n
The analyses of Ethos team revealed that the dolphins approached the barrel much faster when it contained a strongly magnetized block than when it contained a similar not magnetized one. However, the dolphins did not interact with both types of barrels differently. They may therefore have been more intrigued than physically drawn to the barrel with the magnetized block.<\/p>\n
“Dolphins are able to discriminate between objects based on their magnetic properties, which is a prerequisite for magnetoreception-based navigation,” says researcher Dorothee Kremers. “Our results provide new, experimentally obtained evidence that cetaceans have a magenetic sense, and should therefore be added to the list of magnetosensitive species.”<\/p>\n
Image Credit: Plan\u00e8te Sauvage, France<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"Dolphins are magnetosensitive — that is to say, they have an awareness of magnetic fields — according to new research from the Ethos unit of the Universit\u00e9 de Rennes in France. The finding follows on the heels of much recent research greatly widening the number of animals known to be able to sense magnetic fields. 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