Statistical estimators for monitoring spotted owls in Oregon and Washington in 1987.

Tlmothy A. Max; Ray Souter; Kathleen A. O'Halloran

doi:10.2737/PNW-RP-420

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Statistical estimators for monitoring spotted owls in Oregon and Washington in 1987.

Informally Refereed

Authors:

Tlmothy A. Max, Ray Souter, Kathleen A. O'Halloran

Year:

1990

Type:

Research Paper

Station:

Pacific Northwest Research Station

DOI:

https://doi.org/10.2737/PNW-RP-420

Source:

Res. Pap. PNW-RP-420. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 13 p

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Abstract

Spotted owls (Strix occidentalis) were monitored on 11 National Forests in the Pacific Northwest Region of the USDA Forest Service between March and August of 1987. The basic intent of monitoring was to provide estimates of occupancy and reproduction rates for pairs of spotted owls. This paper documents the technical details of the statistical estimation procedures used to produce all the estimates resulting from that effort. All relevant formulae are presented as well as decisions made about collapsing strata to estimate variances. Some complicating aspects of the monitoring effort are also discussed.

Keywords

Spotted owl, Strix occidentalis, sampling, stratified random sampling, monitoring

Citation

Max, Tlmothy A.; Souter, Ray A.; O''Halloran, Kathleen A. 1990. Statistical estimators for monitoring spotted owls in Oregon and Washington in 1987. Res. Pap. PNW-RP-420. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 13 p