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Trends in winter distribution and abundance of ferruginous hawks


, : Trends in winter distribution and abundance of ferruginous hawks. Journal of Field Ornithology 59(3): 209-214

Christmas Bird Counts were used to assess changes in distribution and abundance of Ferruginous Hawks (Buteo regalis) across their wintering range from 1952 to 1984. Over this period, the number of hawks seen has increased significantly, however, most of the increase can be attributed to a dramatic rise in the number of hawks seen over the last 11 yr. On a regional basis, significant increases in abundance were found for California [USA] and the eastern portion of the Ferruginous Hawk's wintering range over the 33-yr-period. The number of hawks seen in other areas of the range over this same period has remained stable.


Accession: 006839566

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Related references

Garrison, BA., 1990: Trends in winter abundance and distribution of ferruginous hawks in California. Transactions of the Western Section of the Wildlife Society, 26: 51-56

Garrison, Barrett A., 1993: Distribution and trends in abundance of rough-legged hawks wintering in California. Distribution and trends in abundance of Rough-legged Hawks (Buteo lagopus) wintering in California were assessed using Christmas Bird Counts (CBCs). Data from 114 individual CBCs conducted in California over 40 yr during the winters of 1949-1950 t...

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