Virginia peregrines have mixed year in 2017
January 16, 2018
By Bryan Watts, Center for Conservation Biology
Virginia supported a known population of 29 pairs of peregrine falcons during the 2017 breeding season (download 2017 report). Two new breeding sites were documented but three long-standing territories were unoccupied. The population had a relatively high hatching rate (81%, 56 of 69 eggs hatched) but some losses both before banding (16.1%, 9 of 56 young lost) and after fledging (3 young known to be lost post-fledging). Of 21 clutches that could be followed completely from laying to fledging, 41 of 53 (77.4%) eggs hatched and 35 of 41 (85.4%) young survived to banding age. The reproductive rate (1.62 young/occupied territory) was considerably lower than in recent years.
Efforts continued in 2017 to identify breeding adults via field-readable bands to better understand dispersal and demography throughout the mid-Atlantic region. The banding status of 47 (81%) of the 58 adult peregrines known within the breeding population was determined. Ten (21%) of the 47 birds were unbanded. The alpha-numerics were read for 29 adults and of these the USGS bands have been recorded for 26. Of the banded birds where state of origin could be determined, 22 were from VA, 5 from NJ, and 3 from MD. Birds ranged in age from 2 to 17 years old.
In addition to adults breeding in Virginia, bands for 12 additional falcons were read and reported over the past year. Seven of these birds (all females) originated in Virginia and were found breeding in other states, including 3 birds in Pennsylvania and 4 birds in New Jersey. A second-year female was photographed multiple times on Chincoteague National Wildlife Refuge. A hatch-year male from Richmond was photographed in Lyndhurst, NJ and a hatch-year female that had been hacked in Shenandoah National Park was photographed near Silver Lake in Rockingham County, VA. A 5-year-old female was identified in Westchester, NY during the early breeding season and may have been on a territory.
The translocation of falcons from the coast to the mountains in an effort to re-establish the historic mountain range continued in 2017. Ten young falcons (including five females and five males) were moved to Shenandoah National Park and hacked. All birds were from bridges that have experienced poor fledging success except two birds that were found on the ground under the Possum Point stack around the time of fledging. All birds fledged and dispersed successfully.
The Virginia population continues to benefit from a tremendous community of dedicated agencies, corporations, and individuals including the Virginia Department of Game & Inland Fisheries, the Virginia Department of Transportation, the U.S. Fish and Wildlife Service, the National Park Service, the U.S. Coast Guard, the U.S. Department of Defense, Dominion, and The Nature Conservancy.