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FEEDING ECOLOGY OF FOUR SYMPATRIC OWLS
Four species of owls, Great Horned (Bubo virginianus), Long-eared ( Asio otus), Burrowing (Speotyto cunicularia), and Barn (Tyto alba), which occur together on the short-grass prairie and farmland ofExpand
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Barn Owl Reproduction: Patterns and Variation near the Limit of the Species’ Distribution
I studied reproduction of the Barn Owl (Tyto alba) in irrigated farmlands of northern Utah for 16 years documenting 391 nesting attempts. Most Barn Owls began nesting at one year of age and producedExpand
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Sex and Age Dimorphism in the Barn Owl and a Test of Mate Choice
-I investigated sex and age dimorphism and the possible effect of body size on mate choice in a northern Utah population of the Barn Owl (Tyto alba). In all characters measured (body mass; length ofExpand
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A long-term study of food-niche dynamics in the Common Barn-Owl: comparisons within and between populations
Food niches of Common Barn-Owl (Tyto alba) populations were studied for 8 years in Utah and Idaho. Small mammals dominated the diet as they do in most parts of the barn-owl's range. Mean prey weightExpand
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Trophic Structure of Raptor Communities: A Three-Continent Comparison and Synthesis
Community ecology is a key to understanding function in nature, but a unified agreement about how communities are ordered has been elusive. Indeed, convictions about their organization range widelyExpand
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Trophic ecology of Athene owls in mediterranean-type ecosystems: a comparative analysis
Populations of Athene owls are found in the mediterranean-type ecosystems of Chile (A. cunicularia cunicularia, formerly in the genus Speotyto), California (A. cunicularia hypugea), and Spain (A.Expand
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Dietary Trends of Barn Owls in an Agricultural Ecosystem in Northern Utah
Abstract Barn Owl (Tyto alba) diets were studied for 15 years in Utah. Ninety-eight percent of 111,016 prey items were mammals, heavily dominated by voles (Microtus spp.). Food-niche breadth (FNB)Expand
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SOME COMPARISONS OF THE FEEDING ECOLOGY OF FOUR OWLS IN NORTH- CENTRAL COLORADO
Four species of owls (Great Homed Owl, Bubo virginianus; Long- eared Owl, Asio otus; Burrowing Owl, Speotyto cunicularia and Barn Owl, Tyto alba) which inhabit the same grassland habitats inExpand
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Geographical Trends in Trophic Characteristics of Mammal-Eating and Bird-Eating Raptors in Europe and North America
ABSTRAcr.-If dietary opportunism occurs in predators over large geographic areas, trends in the trophic characteristics of predators should be explained largely by the distribution patterns of theirExpand
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Community Trophic Structure: The Roles of Diet, Body Size, and Activity Time in Vertebrate Predators
We examined trophic structure in an assemblage of 17 vertebrate predators - two snakes (Pituophis catenifer and Crotalus viridis), six hawks (Circus cyaneus, Buteo jamaicensis, B. regalis, AquilaExpand
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