Longitude Perception and Bicoordinate Magnetic Maps in Sea Turtles
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چکیده
منابع مشابه
Longitude Perception and Bicoordinate Magnetic Maps in Sea Turtles
Long-distance animal migrants often navigate in ways that imply an awareness of both latitude and longitude. Although several species are known to use magnetic cues as a surrogate for latitude, it is not known how any animal perceives longitude. Magnetic parameters appear to be unpromising as longitudinal markers because they typically vary more in a north-south rather than an east-west directi...
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Laboratory experiments were conducted to test the ability of loggerhead sea turtle hatchlings (Caretta caretta L.) to orient using the magnetic field of the earth. Hatchlings were tethered to a rotatable lever-arm apparatus which tracked swimming orientation in complete darkness. Hatchlings tested in the earth's magnetic field were nonrandomly oriented with a mean angle of 42°; those tested und...
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Sea turtles are known to detect chemical cues, but in contrast to most marine animals, turtles surface to breathe and thus potentially have access to olfactory cues both in air and in water. To determine whether sea turtles can detect airborne chemical cues, captive loggerhead turtles (Caretta caretta) were placed into a circular, water-filled arena in which odorants could be introduced to the ...
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At the beginning of their offshore migration, hatchling sea turtles enter the ocean at night and establish a course away from land by swimming directly into oceanic waves. How turtles can detect wave direction while swimming under water in darkness, however, has not been explained. Objects in a water column beneath the surface of the ocean describe a circular movement as waves pass above. In pr...
متن کاملSea turtles
their disciplines, it seemed a possibly useful contribution to write a book that would draw from all the relevant disciplines about the past, from primatology to historical linguistics, with genetics as the common thread to weave all these findings together into a coherent narrative. I was amazed at how much detail can now be filled in on the largely blank pages of human prehistory extending fr...
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ژورنال
عنوان ژورنال: Current Biology
سال: 2011
ISSN: 0960-9822
DOI: 10.1016/j.cub.2011.01.057