Design and results of a waterfowl breeding population survey for Wyoming

Article Abstract:

Experts redesigned the aerial survey method used for estimating wildfowl populations in Wyoming. The redesigned survey, which was used and evaluated in 1993 and 1994, concentrated on areas of high waterfowl density. The survey also investigated the effectiveness of surveying areas of low waterfowl density, and found that inclusion of these areas increased Wyoming waterfowl population estimates by around 100%. The survey designers investigated the effectiveness of using 200-m-wide transects with one observer but did not recommend the use of this technique.

Methods, Surveys, Surveys (Studies), Wyoming

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Evaluation of visibility correction factors for waterfowl surveys in Wyoming

Article Abstract:

The visibility bias of aerial survey of breeding waterfowl in Wyoming has been corrected by double sampling through ground survey or truthing transects. The ratio between air counts and ground counts have been factored in as visibility correction factors (VCFs). The precision of such survey depends on several assumptions which include the following. These are that air and ground crews survey the same waterfowl populations, that ground crew counts all the waterfowl in the area and that both air and ground counts are totalled across the years.

Statistics

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Diet of greater rheas in an agroecosystem of central Argentina

Article Abstract:

Fecal analysis were made to determine the diet of wild greater rheas for the design of appropriate conservation measures. The rheas diet consisted of 90% green material, 9% of seeds and 1% of fragments of invertebrates. The green material consisted mainly of alfalfa and wild dicots which constitutes the diet of rheas for a great part of the year. Diet of rheas were found compatible to incorporate in areas used for cattle ranching.

Food and nutrition, Argentina, Endangered species, Birds

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