Prey Selection and Bioenergetics of Captive Screech Owls

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Title: Prey Selection and Bioenergetics of Captive Screech Owls
Creators: Postler, Janice L.; Barrett, Gary W.
Issue Date: 1982-03
Citation: The Ohio Journal of Science. v82, n1 (March, 1982), 55-58
Abstract: Screech owls appeared to select meadow voles {Microtus pennsylvanicus) as a primary food source, although deer mice (Peromyscus maniculatus) were apparently equally abundant and vulnerable. This feeding behavior resulted in a larger energy reward. A mean ingestion rate of 0.37 kcal/g live wt/day was derived from average values of 29-3 g live wt/day for Microtus as prey and only 11.3 g live wt/day for Peromyscus. Assimilation energy (ingestion-pellets-feces) was 0.28 kcal/g live wt/day; the mean assimilation efficiency (ingested energy-pellet energy-fecal energy/ingested energy x 100) was 76%. These findings support the hypothesis that a large energy reward is a prime factor in prey selection.
Description: Author Institution: Department of Zoology and Institute of Environmental Sciences, Miami University
ISSN: 0030-0950
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