Describing Willow Flycatcher habitats: scale perspectives and gender differences

Article Abstract:

A study was conducted to analyse the habitat selection traits of Willow Flycatchers (Empidonax traillii) at Arapaho National Wildlife Refuge, Colorado, from 1985 to 1986. Nest, song perch and unused sites were studied at three different area sizes. The study showed that Willow Flycatcher habitats were distinguished on the basis of gender-related behavior and the density of vegetation. Females chose densely vegetated areas for nesting while song perch sites of males were found in open areas with low shrub cover. Sites not used by Willow Flycatchers had low shrub density and large uncovered areas.

Environmental aspects, Habitats, Muscicapidae, Flycatchers

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Sequential cavity use in a cottonwood bottomland

Article Abstract:

Secondary cavity-nesting birds (SCNB) are unable to excavate their own nesting sites and rely on natural cavities or cavities created by primary cavity-nesting birds (PCNB). SCNB commonly re-use cavities, but little research has been conducted into the frequency of re-use. A new study examines the use and re-occupancy rates of cavities by a community of cavity-nesting birds in a cottonwood bottomland in Logan County, CO. The study shows substantial variations in the proportion of cavities reused from year to year, although there is no difference in desirability between old SCNB and PCNB nests.

Observations, Natural history

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An experimental study of nest-site selection by Yellow Warblers

Article Abstract:

A series of experiments were conducted at the Arapaho National Wildlife Refuge, Colorado, from 1981 to 1984, to study nest-site selection of Yellow Warblers (Dendroica petechia). The study showed that Warblers built their nests in all seven species of willow shrubs in the study area. The study also showed that Warblers chose nest-sites based on the traits of the horizontal patch surrounding the bush in order to provide greater concealment against predators and brood parasites.

Research, Wood warblers, Arapaho National Forest, Colorado

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