Age- and season-specific variation in local and long-distance movement behavior of golden eagles
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Abstract
Animal movements can determine the population dynamics of wildlife. We used telemetry data to provide insight into the causes and consequences of local and long-distance movements of multiple age classes of conservation-reliant golden eagles (Aquila chrysaetos) in the foothills and mountains near Tehachapi, California. We estimated size and habitat-related correlates of 324 monthly 95 % home ranges and 317 monthly 50 % core areas for 25 birds moving locally over 2.5 years. We also calculated daily, hourly, and total distances traveled for the five of these birds that engaged in long-distance movements. Mean (±SD) monthly home-range size was 253.6 ± 429.4 km2 and core-area size was 26.4 ± 49.7 km2. Consistent with expectations, space used by pre-adults increased with age and was season-dependent but, unexpectedly, was not sex-dependent. For all ages and sexes, home ranges and core areas were dominated by both forest & woodland and shrubland & grassland habitat types. When moving long distances, eagles traveled up to 1588.4 km (1-way) in a season at highly variable speeds (63.7 ± 69.0 km/day and 5.2 ± 10.4 km/h) that were dependent on time of day. Patterns of long-distance movements by eagles were determined by age, yet these movements had characteristics of more than one previously described movement category (migration, dispersal, etc.). Our results provide a context for differentiating among types of movement behaviors and their population-level consequences and, thus, have implications for management and conservation of golden eagle populations.
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Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Age- and season-specific variation in local and long-distance movement behavior of golden eagles |
| Series title | European Journal of Wildlife Research |
| DOI | 10.1007/s10344-016-1010-4 |
| Volume | 62 |
| Issue | 4 |
| Publication Date | May 02, 2016 |
| Year Published | 2016 |
| Language | English |
| Publisher | Springer |
| Contributing office(s) | Forest and Rangeland Ecosystem Science Center |
| Description | 17 p. |
| First page | 377 |
| Last page | 393 |
| Country | United States |
| State | California, Idaho, Montana, Nevada, Oregon, Utah, Wyoming |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |