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Analysis of regional distribution of rough-legged hawks. (Senior Division).

Data from the Audubon Society's annual Christmas Bird Count (CBC) for the Rough-legged Hawk (Buteo lagopus) population in Colorado were analyzed for the years 1980 to 2000. Special focus was given to the data fern the count circle in Boulder in order to determine if the population trends in Boulder were significantly different from those in the rest of the state and/or from the average of other urban areas. Another area of focus was the differences between the population dynamics of urban and rural counts. Statistical analysis of the data revealed that there was significant decline in population of the hawks across the whole state, in urban areas, in Boulder alone, and in the urban counts other than Boulder. The Boulder hawks were found to be declining in number more rapidly than the average of all other uban counts. The timings indicate that Rough-legged Hawks in Colorado and especially in Boulder are responding negatively to changes in the environent, possibly such as urbanization. They also point to a need for further research to examine the needs of this species.

Gwen Woods, Boulder High School
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Author:Woods, Gwen
Publication:Journal of the Colorado-Wyoming Academy of Science
Article Type:Brief Article
Geographic Code:1U8CO
Date:Apr 1, 2002
Previous Article:Effect of varied amounts of sunlight on population levels of the marine rotifer B. pilicatus. (Senior Division).
Next Article:The effects of electromagnetic radiation on ant pheromones. (Senior Division).

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