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Virginia Tech - Use Of Magnetic Pulses On Bird Flocks Effectively Changes Migratory Direction By 90 Degrees!!

 
Anonymous Coward
User ID: 1092082
United States
01/06/2011 12:22 AM
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Virginia Tech - Use Of Magnetic Pulses On Bird Flocks Effectively Changes Migratory Direction By 90 Degrees!!
[link to www.biol.vt.edu]

In these experiments a brief, high intensity magnetic pulse that was strong enough to re-magnetize single-domain magnetite
particles caused the migratory orientation of experienced adults to shift by roughly 90o to
the east during both the Spring and Fall migrations (Wiltschko et al. 1994, 1998).
In
contrast, migratory orientation was unaffected in young silvereyes captured before their
first migration (Munro et al. 1997a). The absence of an effect on young silvereyes, even
though young and old birds appear to have the same magnetic compass mechanism
(Munro et al. 1997b), suggests that pulse remagnetization may have affected a specialized
magnetoreception mechanism used only by experienced migrants. Such a mechanism
could involve single-domain particles of magnetite (Kirschvink and Gould 1981) that
play a role in the map used by experienced adult migrants. Moreover, the roughly 90o
eastward shift in orientation of adult silvereyes exposed to the magnetic pulse (with no
change in the strength of orientation) suggests that the effect of this treatment might have
been perceived by the birds as a displacement to the west perpendicular to the normal
migratory route.

___________________________________________________________

Just throwing this out there... What would happen if maybe they cranked the pulse up a bit higher on these flocks?
Anonymous Coward (OP)
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01/06/2011 12:28 AM
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Re: Virginia Tech - Use Of Magnetic Pulses On Bird Flocks Effectively Changes Migratory Direction By 90 Degrees!!
This could explain why it was just one certain breed falling out of the sky.. They can target specific flocks of birds with a single magnetic pulse.
Anonymous Coward
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01/06/2011 01:33 AM
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Re: Virginia Tech - Use Of Magnetic Pulses On Bird Flocks Effectively Changes Migratory Direction By 90 Degrees!!
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