Translator Disclaimer
1 April 2005 Breeding biology of Dusky Flycatchers in a southern Utah mixed conifer-aspen woodland
Author Affiliations +
Abstract

Dusky Flycatchers (Empidonax oberholseri) nesting in a mixed conifer-aspen woodland in southern Utah occurred at a breeding density of 0.44 territories/ha. Females began laying first clutches 1–26 June; adults fed nestlings (in renesting attempts) as late as mid August. Mean clutch size was 3.8 eggs in first clutches and 3.6 eggs overall. Incubating females spent 90% of daylight hours on the nest, where they were fed by males 1.1 times/ hour. Incubation lasted 14–16 d; nestlings remained in the nest 15–17 d. Thirteen of 32 nests (40.6%) were successful in producing at least one fledgling, with successful nests producing 2.7 young/nest. Based on exposure, probability of a nest surviving from egg laying to fledging was 0.40. Predation accounted for 84.2% of nest failures; brood parasitism by a Brown-headed Cowbird (Molothrus ater) occurred at one nest.

Robert C. Dobbs "Breeding biology of Dusky Flycatchers in a southern Utah mixed conifer-aspen woodland," Journal of Field Ornithology 76(2), 183-192, (1 April 2005). https://doi.org/10.1648/0273-8570-76.2.183
Received: 9 February 2004; Accepted: 1 September 2004; Published: 1 April 2005
JOURNAL ARTICLE
10 PAGES

This article is only available to subscribers.
It is not available for individual sale.
+ SAVE TO MY LIBRARY

SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top