A second geomagnetic feature that varies across the surface of the earth is field intensity.
To determine if hatchling loggerheads can perceive differences in intensity that they experience along their migratory route,
hatchlings were exposed to one of two intensities that they normally encounter during their first months in the sea (LOHMANN & LOHMANN 1996b).
The inclination angle of the field was held constant in these trials.
Turtles tested in a field of 52,000 nT (a field 10.6% stronger than the natal beach field,
and one that hatchlings first encounter near South and North Carolina, USA) swam eastward (Fig. 4).
Those exposed to a 43,000 nT field (a field 8.5% weaker than the natal beach field,
and one first encountered on the eastern side of the Atlantic near Portugal) swam westward (Fig. 4).
A second geomagnetic feature that varies across the surface of the earth is field intensity.
To determine if hatchling loggerheads can perceive differences in intensity that they experience along their migratory route,
hatchlings were exposed to one of two intensities that they normally encounter during their first months in the sea (LOHMANN & LOHMANN 1996b).
The inclination angle of the field was held constant in these trials.
Turtles tested in a field of 52,000 nT (a field 10.6% stronger than the natal beach field,
and one that hatchlings first encounter near South and North Carolina, USA) swam eastward (Fig. 4).
Those exposed to a 43,000 nT field (a field 8.5% weaker than the natal beach field,
and one first encountered on the eastern side of the Atlantic near Portugal) swam westward (Fig. 4).
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