Update on the Eastern Bluebird Trail

December 11, 2014 at 10:30 am Leave a comment

Eastern bluebird nesting boxes

The green roof Eastern bluebird nesting boxes before installation on the trail.

In 2012, the Smithsonian Gardens Green Team developed an Eastern Bluebird Trail at our greenhouse complex in Suitland, Maryland. The trail of ten paired nest boxes was designed to support and expand the year-round resident Eastern Bluebird population. By the end of the 2013 nest season, the bluebird population had expanded to about thirty birds.

What happened in 2014? We began monitoring the trail in March, looking for the first signs of nesting behavior. The monitoring continued through July and in that time, no Eastern Bluebirds have been seen at or around the greenhouse complex. We believe the resident population migrated to another location due to a harsh winter of repeated deep Arctic cold blasts starting in late November and persisting through March. In addition to the cold, we believe the bluebirds did not have enough food to support their population.

American beautyberry and flowering dogwood

American beautyberry (Callicarpa americana, top) and flowering dogwood (Cornus florida, bottom) are bluebird favorites!

Bluebirds rely on fruit for more than thirty percent of their diet. In the winter, when insects are scarce, they depend on persistent fruits more than at any other time of year. The SG Green Team is committed to planting more native tree and shrub species around the facility to provide a sustainable winter habitat for the birds. Planting trees and shrubs not only provides food for birds but also provides shelter from harsh winds and cold temperatures.

-Sarah Hedean, SG Green Team Member

Entry filed under: Green Team, Horticulture. Tags: , , , , .

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