Reproductive ecology of Dusky Flycatchers in western Montana

The Wilson Bulletin


  • The Publications Warehouse does not have links to digital versions of this publication at this time
  • Download citation as: RIS | Dublin Core


Breeding ecology of Dusky Flycatchers (Empidonax oberholseri) was studied in western Montana from May-August 1974. Dusky Flycatchers were monogamous and single-brooded although some pairs made renesting attempts after first nests failed. Length of the reproductive cycle for first nesting attempts, from arrival on the breeding grounds to fledging, was about 70 days. All nests were placed in shrubs, primarily ninebark (Physocarpus malvaceus) and Rocky Mountain maple (Acer glabrum), and were an average of 150 cm above the ground. Females incubated a clutch with an average of 4.0 eggs for 15-16 days, and the average nestling period was 17.5 days. Both sexes fed nestlings and fledglings, but only females brooded nestlings. Egg survival was 63.8%, hatching success was 95.4%, and nestling survival was 61.9% for an overall probability of 0.376 percent that an egg produced a fledgling. Predation was the major cause of nest failure. Dusky Flycatchers reared an average of 1.9 fledglings/pair.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Reproductive ecology of Dusky Flycatchers in western Montana
Series title The Wilson Bulletin
Volume 105
Issue 1
Year Published 1993
Language English
Publisher Wilson Ornithological Society
Publisher location Lawrence, KS
Description 9 p.
First page 84
Last page 92
Country United States
State Montana