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Population study of western grebes in Alberta 2001-2009 : implications for management and status designation

Description

This project was initiated in 2001 to monitor population trends and distribution of western grebes in Alberta. The project began in the Stony Plain study area, and then expanded to other areas of... More ≫

Description

This project was initiated in 2001 to monitor population trends and distribution of western grebes in Alberta. The project began in the Stony Plain study area, and then expanded to other areas of the province where the species occurs. Surveys of known colonies and a search for other breeding sites have continued each year through 2009. Biologists searched for western grebe colonies from the northern extreme of the breeding range in northeast and northwest Alberta, through the parkland and prairies, south to the United States border. Data from previous field seasons have been published in earlier reports in this series.

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Western (Aechmophorus occidentalis) grebes in Alberta : 2006 field summary

Description

This project was initiated in 2001 to monitor population trends and distribution of western grebes and eared grebes in Alberta. The project began in the Stony Plain study area with the intent to... More ≫

Description

This project was initiated in 2001 to monitor population trends and distribution of western grebes and eared grebes in Alberta. The project began in the Stony Plain study area with the intent to expand to other areas of the province where this species occurs. Now completing its sixth season, the study has expanded to the northeast, the northwest and to more areas within the Parkland Natural Region of the province. For the first time, data for all of the above are summarized in one document. The report deals solely with western grebes.

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Western (Aechmophorus occidentalis) and eared (Podiceps nigricollis) grebes of central Alberta : 2002 field summary

Description

The information presented in this report represents the findings from the second year of surveying western and eared grebes within the Stony Plain study area in Alberta. The surveys are projected... More ≫

Description

The information presented in this report represents the findings from the second year of surveying western and eared grebes within the Stony Plain study area in Alberta. The surveys are projected to span a five year period and the project is designed to monitor population trends and reproductive success of western grebes and eared grebes within the Stony Plain study area. In 2002, surveying effort was focused on the primary grebe populations identified in the initial year of the project. The regional population of western grebes was estimated to be approximately 2611 adults on six lakes. The Wabamun Lake colony continues to show signs of poor nesting success, which we now believe to be attributed to high rates of corvid nest depredation. This is a major concern since this colony is ranked nationally significant. Eared grebes were found on 10 lakes, for a conservative overall population estimate of 8633 adults.

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