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Title:

TRAFFIC RELATED MORTALITY AND THE EFFECTS ON LOCAL POPULATIONS OF BARN OWLS (TYTO ALBA)

Accession Number:

00745661

Record Type:

Component

Availability:

National Technical Information Service

5301 Shawnee Road
Alexandria, VA 22312 USA

Abstract:

This paper presents results of data collected from weekly surveys of traffic induced mortality of barn owls at three sites along two California highways in rural areas from May 25, 1995 to November 26, 1995. For each owl, spot of collection, adjacent habitat and current weather conditions were recorded. Age and sex of the collected owls were determined by differences in molt patterns, plumage and body size. There was a significant difference in the number of collected owls between the three sites. Differences in the adjacent habitat appear to be responsible for the distribution of fatalities among the three sites. Of the 227 owls collected, 61% were juveniles and 39% were adults. There was a significantly skewed sex-ratio: 74% of the collected owls were females. Differences in local population demography and/or vulnerability may result in a greater number of both female and hatching year owls collected. A life history model was constructed in order to assess the impact of traffic related mortality on the growth rate of these populations. Results from the model predict that when about 48% of adult mortality is due to traffic or 27% of the hatching year mortality is due to traffic, the population growth rate drops below one and the population is in decline.

Supplemental Notes:

Also published by Florida DOT as a paper in FL-ER-58-96, "Trends in Addressing Transportation Related Wildlife Mortality: Proceedings of the Transportation Related Wildlife Mortality Seminar (June 1996).

Report Numbers:

FHWA-PD-96-041

Language:

English

Corporate Authors:

Florida Department of Transportation

Haydon Burns Building, 605 Suwanee Street
Tallahassee, FL 32301 USA

Federal Highway Administration

1200 New Jersey Avenue, SE
Washington, DC 20590 USA

Authors:

Moore, T G
Mangel, M

Editors:

G Evink
D Ziegler
P Garrett
J Berry

Pagination:

p. 125-140

Publication Date:

1996-8

Conference:

Transportation and Wildlife: Reducing Wildlife Mortality and Improving Wildlife Passageways Across Transportation Corridors

Location: Orlando, Florida
Date: 1996-4-30 to 1996-5-2
Sponsors: Florida Department of Transportation; Federal Highway Administration; Post, Buckley, Shuh and Jernigan, Inc.; Parsons, Brinckerhoff, Quade & Douglas; and US Forest Service.

Features:

Appendices (1) ; Figures (7) ; References; Tables (2)

Uncontrolled Terms:

Geographic Terms:

Old TRIS Terms:

Subject Areas:

Design; Environment; Highways; Planning and Forecasting; Society; I21: Planning of Transport Infrastructure

Files:

TRIS, USDOT, STATEDOT

Created Date:

Jan 30 1998 12:00AM

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