Migration Mapping – Purple Martins
by The Birdfreak Team on January 28, 2007
The Purple Martin Conservation Association (PMCA) is a non-profit organization “devoted exclusively to the scientific study of Purple Martins (Progne subis), their biology, and habitat requirements”.
One important project of the PMCA is called the Scout Arrival Study. They collect migration reports from all over the United States and then map them according to when and where they arrive. Each year (since 1998) the PMCA collects more and more data.
This map shows the arrival dates and breeding ranges of Purple Martins
The PMCA also collects data on the location of Purple Martin colonies. Anyone with housing for Purple Martins (whether active or inactive) can fill out a short form with their information. There are over 50,000 registered colonies. Tracking birds by user information through the internet is a growing method of figuring out where birds are being seen (or not seen).
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