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| 文件类型: | 文章 |
|---|---|
| 所有的著者/提供者: | Josef K Schmutz; Richard W Fyfe |
| ISSN: | 0010-5422 |
| OCLC号码: | 478446211 |
| 语言注释: | English |
| 注意: | FIGURE 2. Location of recovered Ferruginous Hawks is shown in relation to banding area and wintering range of this species. The solid line outlines the entire wintering range of this species based on 1,532 sightings of Ferruginous Hawks during 37,172 hr of observation on Audubon Christmas Bird Counts from 1980 to 1983. The broken line denotes the "concentrated" winter range and includes counts where more than one hawk was seen per 100 km travelled. In Mexico, Ferruginous Hawks were seen on few counts totalling only 112 hr of observation and hence a concentrated range is not shown. The entire range shown there represents sightings and recoveries combined. |
| 奖励: |
摘要:
Since 1967, 2,444 Ferruginous Hawks (Buteo regalis) have been banded in southeastern Alberta and 80 recoveries are examined. The majority of Alberta Ferruginous Hawks winter in Texas. Upon departing from their grassland breeding range in September or October, they exhibit a strong tendency to remain in habitat broadly categorized as grassland. As a result, the hawks mix little with the westerly populations frequenting desert shrub habitat. While in Texas, Ferruginous Hawks are common near black-tailed prairie dog (Cynomys ludovicianus) colonies regardless of the land use in the surrounding area. Survivorship schedules based on band returns suggest that 66% of the hawks die during their first year.
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添加标签 目的是为 "Migration and Mortality of Alberta Ferruginous Hawks".
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