U.S. Geological Survey Home Page USGS Patuxent Wildlife Research Center Science Meetings; dedicated to Chandler S. Robbins USGS Patuxent Wildlife Research Center; Science Meetings dedicated to Chandler S. Robbins Dedicated to Chan Robbins USGS Patuxent Wildlife Research Center; Science Meetings dedicated to Chandler S. Robbins Poster Abstracts from USGS Patuxent Wildlife Research Science Meetings, October, 2006
Patuxent Science Meeting 2006 Poster Abstract

Routes, timing, and stopovers of migrating sub-adult Florida Bald Eagles

Mojica EK (WSFNR), Meyers JM, Millsap BA (FWS), Haley K (FL F&WCC)

Florida Bald Eagles migrate in summer throughout the Eastern United States and Canada. We

describe routes, migrating distance, length of time, and stopover areas of 59 sub-adult eagles

fitted with satellite transmitters (1997-2001). Nine eagles did not migrate. During their first

year, the migratory eagles flew north in summer along the Coastal Plain (n = 24) and

Appalachian Mountains (n = 26). We hypothesized that there would be differences in distance

traveled by eagles for route, sex (size), and calendar year. We analyzed distance traveled

using 3-way ANOVA (sex x route x year). We found no differences in main effects or

interaction terms for sex or year; however, route distances did differ. Coastal migrants traveled

less ( = 1397 km) than mountain migrants ( = 2112 km; F1, 31= 9.11, P= 0.005). Length of

migration time was longer for southward movements ( = 34 days) than for northward movements

( = 22 days; paired t-test: df = 38, t = -2.2, P = 0.03). Eagles visited stopovers 0-3 times

during migration, staying 6-54 days ( = 14 days, SE = 0.98, n = 59). Identification of these

stopovers may be important for their future conservation, which may serve to replenish energy

reserves for eagles during migration.

Friday, September 22, 2006



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