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| Interpretation
(GRB): Cause for Concern: The number of Kestrels counted at Hook has shown considerable variation, but has generally been declining since 1971. During the last 10 years, the decline seems to be more exaggerated, with numbers decreasing at a faster rate: 3 times faster. Closer examination of the graph shows other periods with sharp declines, suggesting that we should not be too concerned. However, the Kestrel counts for 8 of the last 9 years have been the lowest counts in the history of Hook, with 2008 and 2009 the lowest of all. |
| About the trend lines: |
The trend lines have not been tested for significance. Their intent is to provide an overview of the general trend. The graphs show two trend lines: 1971 - present, and the last 10 years. The Hook Mountain Hawk Watch began in 1971, and the points with blue markers indicate the totals for all these years. The points that show red squares around the blue markers represent the last ten years, showing the trend in this last decade. more about trend lines . . . . |