Patuxent Wildlife Research Center (PWRC)    Migratory Bird Research (MBR)    Comments/FAQ(comments)

Circle Trend Analysis Form


This part of the Home Page provides data and results from individual survey circles. You select a species, a circle, and a starting and ending year, and the Home Page will conduct an analysis for that species and period. This is experimental, so exercise caution in reviewing the results.

Caution! No species is found on every circle, and some circles have data of insufficient quality to estimate change. Consequently, some, analyses will provide empty graphs, and "NaN" errors indicating insufficient information.



Please enter the species aou code:

Please enter the region of interest:

Please enter the first year:

Please enter the last year:



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Although these data have been processed successfully on a computer system at the National Biological Service, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that these data are directly acquired from a National Biological Service server, and not indirectly through other sources which may have changed the data in some way. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. The National Biological Service shall not be held liable for improper or incorrect use of the data described and/or contained herein.

So, these data are provided "as is" and without any express or implied warranties, including, without limitation, the implied warranties of merchantability and fitness for a particular purpose. Also, use of trade names or commercial products in this home page is solely for the purpose of providing specific information, and does not imply recommendation or endorsement by the U.S. Government.