
As shrublands from abandoned pastures have slowly been lost to forest, so have Golden-winged warbler populations. The golden-winged warbler is declining precipitously in the northeastern U.S.
The decline may be due, in part, to a loss of shrubland habitat. But the decline also correlates with the range expansion of its close cousin, the blue-winged warbler. The areas they now share have led not only to increased competition, but also to widespread interbreeding and golden-wings are the losers.
Golden-wings, blue-wings and hybrids frequently nest in dry, upland sites produced by natural succession on abandoned farmland. They also occur in alder swamp and beaver meadows in southern locations and along the edge of tamarack swamps in northern locations. Dry areas are usually covered by goldenrod and scattered shrubs. In wetter areas the vegetation includes sedge and alder, but rarely cattails. They can be found in young conifer plantations that still have abundant open areas between the trees. Both birds occur in openings of several acres in clear-cuts.
Golden-wing and blue-wing territories are large, typically 2-4 acres. Within an individual’s territory the vegetation usually has patches of shrubs and some forest edge. These edges as well as scattered taller trees are used as singing perches.
Males of golden-winged and blue-winged warblers and their hybrids regularly sing songs phonetically represented as zee bee bee bee for golden-wings and beee buzzzz for blue-wings. This song is given most frequently when males first arrive on a breeding territory to attract mates and define a territory. Hybrids cannot be distinguished from pure individuals by song.
A small "colony" of golden-winged warblers on Hollow Road in Monkton was reported last week. Three males were singing Golden-winged songs. One bird was along a shrubby powerline, another in a willow-dominated wetland, and a third in a grove of young poplar trees. Of the birds observed, one bird was a pure blue-winged, the other a pure golden-winged.
Other highlights during the past week included least bitterns in West Rutland marsh and Grand Isle, a family of red-breasted mergansers on the Burlington waterfront, a single Caspian tern at Delta Park in Colchester, a rarely-observed laughing gull on Lake Dunmore in Salisbury, and an orchard oriole in Brattleboro. An active red-bellied woodpecker nest found in Manchester Center provided further evidence of this species' steady northward spread into Vermont.
You can learn about all bird sightings the past week and more on Vermont eBird.
Visit the Cornell Lab of Ornithology Golden-winged Warbler Atlas Project.
Kent McFarland, VINS Ornithologist











