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