Spring
Migration
Banding efforts for the spring songbird migration
began in earnest during the first week of April. Our first efforts were often
influenced by the passage of several weather fronts that brought high winds and
colder that average temperatures in the Concho Valley. In spite of the weather, we were able to
encounter some migrants during the first half of the month. Our most unexpected
bird during this time was a Common Ground-Dove which is not a migrant but not
expected in the Concho Valley during this season of the year. On the 19th of April, we banded our first
Painted Bunting of the year which arrived several days earlier than past years.
This bird was soon followed by Lazuli and Indigo Buntings, Blue Grosbeaks and
Summer Tanagers. During the last week of April, the floodgates finally opened
and we were rewarded with swarms of migrating Pine Siskins, wood warblers,
buntings, and goldfinches.
With the drought that occurred in the mid-west in
the summer of 2012 and the subsequent low number of migrants encountered in the
fall, we anticipated that the number of spring migrants would be lower than
most years throughout the Concho Valley.
In fact, near record numbers of Orange-crowned, Nashville, Wilson's, and
Yellow Warblers funneled through the riparian corridor along with good numbers of
less common but still expected warblers. With more than two weeks remaining in
the month of May, we are still encountering such species as MacGillivray's
Warbler, Tennessee Warbler, Northern Waterthrush, and Oven Bird. We expect to
see other less common warblers as the season draws to a close. Winter and
spring rains have been sparse across the Concho Valley. Perhaps these birds are
being forced into the riparian corridor to find water and other resources as they
head to their breeding grounds. The conditions and results are beginning to
mirror the 2011 season when we encountered many more birds and species than a
normal year. The final results will not be written until the last waves of
migrants have made their way through our banding stations.