Postfledging nest dependence period for bald eagles in Florida

Article Abstract:

The postfledging nest dependence period for bald eagles is ill understood and few studies have focused on the issue. A new study of fledgling bald eagles in north-central Florida seeks to determine the postfledging nest dependence period and spatial use of the nest before migration. It is shown that postfledging periods varies between four and 11 weeks depending upon the individual, with most fledglings observed being within 229 mt of the nest. It is recommended that human activity around nest sites is restricted during the postfledging dependency period.

Florida, Behavior, Natural history, Birds, Birds of prey, Raptors (Birds), Nestlings

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Mercury concentrations in tissues of Florida bald eagles

Article Abstract:

A study involving Florida's bald eagles concluded that mercury concentrations among them may not be enough to cause mortality but are still capable of causing behavioral changes or reduced reproduction. Mercury concentrations in blood and feather samples of the nestling bald eagles were correlated. Some Florida nestlings exhibited blood mercury concentrations that reach 0.61 ppm, over 200% higher than those of captive adults. Mercury concentrations in the feathers of both nestlings and adults were higher than those in captive eagles.

Health aspects, Mercury (Metal), Mercury in the body

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Survival probability and mortality of migratory juvenile golden eagles from interior Alaska

Article Abstract:

Satellite telemetry was used to estimate the probability of first-year survival for migratory golden eagles raised in Denali National Park and Preserve, Alaska, USA. It indicated that monthly survival probability was lower during autumn migration and early winter periods, whereas the causes of mortality included starvation, electrocution and poaching.

Alaska, Environmental aspects, Denali National Park and Preserve, Alaska, Golden eagle, Migratory birds

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