| 文件类型： |
文章 |
| 所有的著者/提供者： |
Russell P Balda; Barbara Clark McKnight; Clarence D Johnson |
| ISSN: | 0043-5643 |
|---|
| OCLC号码： |
481761720 |
| 语言注释： |
English |
| 注意： |
Fig. 1. View showing woodland and riparian vegetation at the Cedar Crest, New Mexico capture site.
Fig. 2. View showing the habitat where Flammulated Owls were captured at Flag-staff, Arizona. |
| 奖励： |
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摘要：
Captures of Flammulated Owls in mist nets from one site each in New Mexico and Arizona for periods of 7 and 5 years form the basis for this report. Owls were captured only in the spring at the New Mexico site at a lower elevation than the Arizona site where owls were only captured in the fall. Insects sampled in the ponderosa pine forest site in Arizona show that large moths are much more abundant in the fall than in the spring. The owls appear to select different migratory habitats in fall than spring. The major reason for the habitat shift appears to be an ample supply of large, nocturnal insects at higher elevations in the fall allowing the bird to efficiently exploit a migratory habitat similar to its breeding habitat.
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文章 : 英语