Article Abstract:
Studies of the migration cycle of Golden Eagles (Aquila chrysaetos canadensis) using satellite radio tracking indicate that the birds breeding on the east coast of Hudson Bay, Quebec, winter in the eastern US. The birds leave their breeding area by mid- to late Oct. The routes used by the birds differ, but the general path is the same for each individual during the fall and spring migrations. Fall migration takes from 26-40 days, while the spring migration lasts 25-51 days. The birds migrate 1650 to 3000 km south of their breeding areas, winter for 93 to 135 days and return to the breeding sites by late Mar-early May.
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Article Abstract:
Transmission towers are often used by raptors as alternative sites for nesting, perching, hunting and roosting but it is unknown whether birds spending great amounts of time in the vicinity of power lines are affected by electromagnetic fields (EMF). A new study investigates whether EMF affect the body mass of reproducing American kestrels and whether EMF exposure is related to increased intake of dry matter. The study shows that exposure to EMF affected the body mass of reproducing males but not reproducing females. EMF also affected the birds' response to the photoperiod, so advancing the molt of EMF males.
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Article Abstract:
Research concerning the effect of electromagnetic fields on the growth of nestlings of male and female captive American Kestrels is presented. Bones, feathers and body mass were measured every three days after hatching.
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