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Ecological Uses of Vertebrate Indicator Species: A Critique
TLDR
It is concluded that an absence of precise definitions and procedures for selection and use of vertebrates as ecological indicators is confounded. Expand
Assessment of Counting Techniques
Counts of birds are used for many purposes in a variety of field studies. Simple presence-or-absence information suffices to study avian biogeography, but indices of abundance are needed to track theExpand
The California Spotted Owl: A Technical Assessment of Its Current Status.
This report is based an the Final Repart submitted on May 8, 1992 by the Technical Assessment Team to the interagency Steering Committee for the California Spotted Owl Assessment. The 13 chaptersExpand
Radio-Tracking Confirms a Unique Diurnal Pattern of Spatial Occurrence in the Parasitic Brown-Headed Cowbird
TLDR
The cowbird's commuting pattern, which is unique among passerines, involves a shift from largely asocial behavior in the morning to extreme sociality in the afternoon, unlike related nonparasitic icterids that disperse from central breeding sites to feed. Expand
The Influence of Habitats on Mating Systems of North American Passerine Birds
TLDR
Regardless of sex ratio, a polygynous mating is expected to be adaptive for the females as well as for the male, and marshes and prairies are more likely than forests to present the minimum requisite food supply and sufficiently great differences in available food between territories for selection to favor polygyny. Expand
A COMPARISON OF THE BREEDING ECOLOGY OF BIRDS NESTING IN BOXES AND TREE CAVITIES
TLDR
Researchers should use caution when extrapolating results from nestbox studies of reproductive success, predation rates, and productivity of cavity-nesting birds, given the different responses of these four species to nesting in boxes. Expand
Flammulated, boreal, and great gray owls in the United States: A technical conservation assessment
Flammulated (Otus flammeolus), boreal (Aegolius funereus), and great gray (Strix nebulosa) owls occur over a broad portion of North America and each is designated as a "sensitive species" in four orExpand
EVOLUTION OF POLYGAMY IN THE LONG‐BILLED MARSH WREN
TLDR
It is pointed out that if sexual selection results in sexual dimorphism expressed during the period of parental care, there may be a change in average expenditure per sex with a consequent change in sex ratio, and mate preference, which in my opinion should have a profound influence on the mating system, may also have an effect on the sex ratio. Expand
Foraging Habitat and Home-Range Characteristics of California Spotted Owls in the Sierra Nevada
We examined habitat use patterns at two spatial scales among six radio-tagged California Spotted Owls (Strix occidentalis occidentalis) in the Sierra Nevada. Foraging owls selected macrohabitatsExpand
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