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Article
Breanna F. Powers, Auteur ; Jason M. Winiarski, Auteur ; Juan M. Requena-Mullor, Auteur ; Julie A. Heath, AuteurIn migratory birds, among- and within-species heterogeneity in response to climate change may be attributed to differences in migration distance and environmental cues that affect timing of arrival at breeding grounds. We used eBird observations[...]
Article
Christopher J. W. McClure, Auteur ; Jessi L. Brown, Auteur ; Sarah E. Schulwitz, Auteur ; John Smallwood, Auteur ; Kathleen E. Farley, Auteur ; Jean-François Therrien, Auteur ; Karl E. Miller, Auteur ; Karen Steenhof, Auteur ; Julie A. Heath, AuteurDans Ibis (163(2) 2021)Demographic differences between stable and declining populations can lend insight into drivers of population decline. The American Kestrel Falco sparverius is a widespread and often-studied falcon, yet its demography is poorly understood, and th[...]
Article
Robert J. Spaul, Auteur ; Julie A. Heath, AuteurDisturbance because of human activity, including recreation on wildlands, can affect bird behavior which in turn can reduce breeding success, an important consideration for species of management concern. We observed Golden Eagles (Aquila chrysae[...]
Article
Karen Steenhof, Auteur ; Julie A. Heath, AuteurMany hypotheses attempt to explain why younger, less experienced birds have a relatively low reproductive output. We evaluated reproductive patterns of marked American Kestrels Falco sparverius nesting in boxes in southwestern Idaho from 1992 to[...]
Article
Peter C. Frederick, Auteur ; Julie A. Heath, Auteur ; Robert Bennetts, Auteur ; Heinz Hafner, AuteurCounts of nest starts are often used as indicators of the size of avian nesting populations, or of avian productivity. However, the accuracy of single or repeated counts of unmarked nests over time for estimating seasonal numbers of nests may be[...]
Article
David L. Leonard, Auteur ; Julie A. Heath, AuteurLinks between morphology and foraging strategies have been well established for many vertebrate groups. Foraging strategies of Melanerpes woodpeckers are especially variable, with at least six species being proficient flycatchers; the remainder [...]
Article
Julie A. Heath, Auteur ; Karen Steenhof, Auteur ; Mark A. Foster, AuteurGlobal climate change has affected avian migration patterns and nesting phenology. Changes in one phase of a bird's cycle will most likely affect other stages, but few studies focus simultaneously on multiple life-history events. We used western[...]
Article
Julie A. Heath, Auteur ; Peter C. Frederick, AuteurMany birds undergo bare part color changes during the breeding season. Most investigators have focused on color as a signal of individual quality. An alternative, but not exclusive, function of bare part color may be signaling readiness to breed[...]
