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Trends in North American small mammals found in common barn-owl (Tyto alba) dietary studies

Canadian Journal of Zoology

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Abstract

Data on mammals were compiled from published studies of common barn-owl (Tyto alba) pellets. Mammalian composition of pellet samples was analyzed within geographic regions in regard to year, mean annual precipitation, latitude, and number of individual mammals in the sample. Percentages of individuals in pellets that were shrews increased whereas the percentages of rodents decreased with greater mean annual precipitation, especially in northern and western areas of North America. From the 1920s through 1980s, in northern and eastern areas the percentage of species that was shrews decreased, and in northern and central areas the percentage of individuals that was murid rats and mice increased. Human alterations of habitats during these seven decades are postulated to have caused changes in available small mammals, leading to changes in the barn-owl diet.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Trends in North American small mammals found in common barn-owl (Tyto alba) dietary studies
Series title:
Canadian Journal of Zoology
Volume
69
Issue:
12
Year Published:
1991
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
3093-3102
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Canadian Journal of Zoology
First page:
3093
Last page:
3102
Number of Pages:
10