Spatial structure in the diet of imperial eagles Aquila heliaca in Kazakhstan
Journal of Avian Biology
By: T.E. Katzner, E. A. Bragin, S.T. Knick, and A.T. Smith
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Abstract
We evaluated the relationship between spatial variability in prey and food habits of eastern imperial eagles Aquila heliaca at a 90,000 ha national nature reserve in north-central Kazakhstan. Eagle diet varied greatly within the population and the spatial structure of eagle diet within the population varied according to the scale of measurement. Patterns in dietary response were inconsistent with expectations if either ontogenetic imprinting or competition determined diet choice, but they met expectations if functional response determined diet. Eagles nesting near a high-density prey resource used that resource almost exclusively. In contrast, in locations with no single high-density prey species, eagles' diet was more diverse. Our results demonstrate that spatial structuring of diet of vertebrate predators can provide important insight into the mechanisms that drive dietary decisions. ?? OIKOS.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Spatial structure in the diet of imperial eagles Aquila heliaca in Kazakhstan |
| Series title | Journal of Avian Biology |
| DOI | 10.1111/j.2006.0908-8857.03617.x |
| Volume | 37 |
| Issue | 6 |
| Year Published | 2006 |
| Language | English |
| Contributing office(s) | Forest and Rangeland Ecosystem Science Center |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Avian Biology |
| First page | 594 |
| Last page | 600 |
| Google Analytic Metrics | Metrics page |