Grey W. Pendleton

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Many factors affect the use of point counts for monitoring bird populations, including sampling strategies, variation in detection rates, and independence of sample points. The most commonly used sampling plans are stratified sampling, cluster sampling, and systematic sampling. Each of these might be most useful for different objectives or field situations.(More)
Genetic studies and differing population trends support the separation of Steller sea lions (Eumetopias jubatus) into a western distinct population segment (WDPS) and an eastern DPS (EDPS) with the dividing line between populations at 144° W. Despite little exchange for thousands of years, the gap between the breeding ranges narrowed during the past 15-30(More)
Maps generated from bird survey data are used for a variety of scientific purposes, but little is known about their bias and precision. We review methods for preparing maps from point count data and appropriate sampling methods for maps based on point counts. Maps based on point counts can be affected by bias associated with incomplete counts, primarily due(More)
The United States population of Steller sea lions (SSL), Eumetopias jubatus, is classified as ''threatened'' under the Endangered Species Act" because of a recent 73% decline in numbers. National Marine Fisheries Service (NMFS) has recommended that the US population of SSL be divided into two stocks, with an east-west division at 144 0 west longitude, based(More)
Large numbers of harbor seals (Phoca vitulina) use habitat in tidewater glaciers in Alaska for pupping, breeding, and molting. Glacial fjords are also popular tourist destinations; however, visitation by numerous vessels can result in disturbance of seals during critical life-history phases. We explored factors affecting haul-out behavior of harbor seals at(More)
The Alaska Department of Fish and Game does not endorse or recommend any specific company or their products. Product names used in this publication are included for completeness but do not constitute product endorsement. Final Wildlife Research Reports are final reports detailing the objectives, methods, data collected and findings of a particular research(More)
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