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Species at risk survey report : western grebe populations at Buffalo and Gull lakes 2023

Description

The western grebe (Aechmophorus occidentalis) is a colonial waterbird. This report documents population estimates of adult western grebes at Buffalo and Gull Lake in 2023, compares these estimates... More ≫

Description

The western grebe (Aechmophorus occidentalis) is a colonial waterbird. This report documents population estimates of adult western grebes at Buffalo and Gull Lake in 2023, compares these estimates to previous assessments at those lakes, and discusses population trends.

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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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