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Interpreting the CBC circle history report

The report generated by the circle history request page is not perfect, but the author hopes it is useful in most cases.

Format of the report

One annoying feature is that recent splits can make records from before the split impossible to extract.

For example, two former species of towhees (Brown and Rufous-sided) have been split recently, but the program that generates this report does not make any assumptions about which records pertain to which side of the split. Therefore, if you are interested in monitoring trends in towhee populations, you will be frustrated because all older records for both forms are lumped together in the line for genus Pipilo. There is no easy general solution for this problem. If you really need the numbers in such cases, please write me; they can be extracted with some work.

Next: Christmas Bird Count Database corrections
See also: The Christmas Bird Count database project
Previous: Christmas Bird Count: Circle history report request
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John W. Shipman,
Last updated: 1999/02/07 22:26:59