How sea turtles and other aquatic life find their way across the open ocean, far from any real navigation aids or natural signposts, has long intrigued biologists. Now, a new study reveals that turtles have basic geomagnetic steering built in – but
has established that these turtles do have some sense of Earth's magnetic field, which can help in their route planning, up until now it hasn't been clear just how precise or accurate this magnetic mapping technique is.Compared to other turtle speciesChanges in the strength and the direction of the magnetic field around Earth are used by multiple species in order to figure out which way to go.
"It doesn't allow pinpoint straight-line migration, but it does tell them when they're getting a long way off route," marine ecologist Graeme Hays, from Deakin University in Australia, toldThere was some evidence of course correction in both open water and more shallow water closer to land, the researchers report. Many of the findings in this study match up with what's previously been observed in green turtles .
As far as the researchers could tell, ocean currents did not affect the way the turtles got from A to B. Nor did the turtles appear to wait for a certain set of local weather conditions before setting off on their journeys – they began their travels right after breeding., which usually find their destinations quickly, and most probably use smells carried on the wind to do so. It would appear that sea turtles have no such signals to make decisions from.
"Our findings suggest that sea turtle navigational abilities are far from perfect, but rather may simply be as good as possible within the constraints of their sensory ability,"
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