Purple martins and tree swallows have another year of successful breeding

Stringent monitoring of the purple martin and tree swallow nest boxes at Hammonasset Beach State Park continue to pay dividends with the number of young birds fledging increasing once again.

For the first year all 31 tree swallow boxes were occupied with swallow pairs producing eggs. After five years of increases the number of fledglings fell slightly last summer. This year there was a 27% increase over last, with 151 tree swallows fledging.

Top line - number of laid
Bottom line - number of fledglings

Purple martins were just as successful. For the fifth straight year, the number of nesting pairs, eggs laid, and fledglings increased. Forty-four of the 48 compartments in the four martin houses were occupied, an astonishing 230 eggs were laid, and the adult martins were able to successfully raise 180 fledglings.

Top line - number of laid
Bottom line - number of fledglings

Again this year DEEP wildlife biologists spent one July morning banding the young purple martins. Using silver Federal numbered bands and colony-specific colored bands, one hundred fifty-seven young were weighed, aged, and banded. Twenty other martins were either too young or too old for banding.

Derrick Hendy (third from left), Assistant Warden at the Crooked Tree Wildlife Sanctuary in Belize, participated in the DEEP banding. He spent two months at Audubon Sharon learning banding, bird census, and other monitoring techniques to be used in his staff position with Belize Audubon. The training program is part of Audubon’s International Alliances Program.
More photos of the banding.

John Picard, Menunkatuck Vice-president and Conservation Chair, is responsible for the increase in fledgling success rates. He keeps the nest boxes closed until a number of tree swallows and purple martins have arrived from their winter homes. Neither bird begins nesting when they arrive, sometimes waiting a week or longer. When the birds start to show nesting behavior John opens the nest boxes. He continues to monitor them during nest building and evicts any house sparrows that might try to compete with the swallows and martins. After the birds have laid eggs, John still monitors the boxes – house sparrows can continue to be a problem. The results of John’s persistent monitoring are evident.

With the increased number of purple martins nesting at Hammonasset, Menunkatuck plans to install a fifth purple martin house at the Chase (Swan) Pond colony in Spring, 2013, in time for next year’s breeding season.