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The 2003 loggerhead shrike survey in Alberta

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In Alberta, the loggerhead shrike is considered to be a Species of Special Concern. Since 1987, a prairie-wide roadside survey has been conducted every five years to monitor populations. This... More ≫

Description

In Alberta, the loggerhead shrike is considered to be a Species of Special Concern. Since 1987, a prairie-wide roadside survey has been conducted every five years to monitor populations. This report summarizes results of the 2003 survey conducted in Alberta. Observers recorded 168 shrikes at 144 unique locations. Shrike densities have shifted over the last three surveys, possibly in response to recent drought. However, populations remain highest in the east-central parts of the province. Shrikes were found in a wide variety of upland and grassland types, with most birds being associated with mixed trees and shrubs or shelterbelts. Estimates suggest an overall population of 8,327 pairs in Alberta.

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The use of call playbacks for censusing loggerhead shrikes in southern Alberta

Description

The loggerhead shrike is considered to be a Species of Special Concern. A variety of survey techniques have been used to monitor population size and distribution of shrikes in Alberta. These... More ≫

Description

The loggerhead shrike is considered to be a Species of Special Concern. A variety of survey techniques have been used to monitor population size and distribution of shrikes in Alberta. These include Breeding Bird Surveys, surveys conducted from moving vehicles, ground searches of roadside habitats, and intensive block surveys. This report presents the result of experiments with the use of call playbacks to improve detection frequency of loggerhead shrikes during surveys. Loggerhead Shrikes showed variable responses to call playback, but birds were more likely to be detected when playback was used. The playback technique therefore offers a valuable tool for enhancing surveys for shrikes.

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