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2004•The Wilson BulletinRequires access

HOME RANGE AND HABITAT USE BY AMERICAN CROWS IN RELATION TO TRANSMISSION OF WEST NILE VIRUS

Sarah A. Yaremych, Robert J. Novak, Arlo Raim, Phil C. Mankin, Richard E. Warner

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Abstract

Determining the sizes and characteristics of home ranges among American Crows (Corvus brachyrhynchos) in spring/summer is essential for understanding the importance of this species in the transmission of West Nile virus. In late spring, summer, and early fall of 2002, we radio-tracked 45 American Crows to estimate their movements and habitat preferences in urban and adjacent agricultural habitats in east-central Illinois. The 95% minimum convex polygon home ranges averaged 9.6, 6.7, and 6.4 km2 for hatch-year, sub-adult, and adult crows, respectively. Proportional habitat use was investigated at two scales: (a) at the study site scale, there was a preference for low- to medium-density urban habitat and avoidance of forested habitat; and (b) at the home range scale, there was a preference for agricultural cover and avoidance of high-density urban habitat.

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What this paper is about

Determining the sizes and characteristics of home ranges among American Crows (Corvus brachyrhynchos) in spring/summer is essential for understanding the importance of this species in the transmission of West Nile virus. In late spring, summer, and early fall of 2002, we radio-tracked 45 American Crows to estimate their movements and habitat preferences in urban and adjacent agricultural habitats in east-central Illinois. The 95% minimum convex polygon home ranges averaged 9.6, 6.7, and 6.4 km2 for hatch-year, sub-adult, and adult crows, respectively. Proportional habitat use was investigated at two scales: (a) at the study site scale, there was a preference for low- to medium-density urban habitat and avoidance of forested habitat; and (b) at the home range scale, there was a preference for agricultural cover and avoidance of high-density urban habitat.

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Available abstract

Determining the sizes and characteristics of home ranges among American Crows (Corvus brachyrhynchos) in spring/summer is essential for understanding the importance of this species in the transmission of West Nile virus. In late spring, summer, and early fall of 2002, we radio-tracked 45 American Crows to estimate their movements and habitat preferences in urban and adjacent agricultural habitats in east-central Illinois. The 95% minimum convex polygon home ranges averaged 9.6, 6.7, and 6.4 km2 for hatch-year, sub-adult, and adult crows, respectively. Proportional habitat use was investigated at two scales: (a) at the study site scale, there was a preference for low- to medium-density urban habitat and avoidance of forested habitat; and (b) at the home range scale, there was a preference for agricultural cover and avoidance of high-density urban habitat.

Key concepts: Home range, Habitat, Geography, Spring (device), West Nile virus, Ecology, Range (aeronautics), Biology

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