Factors affecting visibility rate of waterfowl surveys in the Mississippi alluvial valley

Article Abstract:

A study has been conducted to investigate the factors that cause changes in visibility and abundance in aerial surveys of wintering waterfowls in the Mississippi Alluvial Valley during Feb. 1990 and 1991 using decoys. Results revealed that habitat, transect size and group size of decoys affected visibility rate and the ability to detecting abundance in waterfowl populations. The magnitude and direction of population change was shown to influence visibility rate. Results suggest that smaller transects should be used to effectively detect wintering waterfowl populations.

Research, Measurement, Mississippi, Natural history, Waterfowl, Bird populations

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Use of solicited bands and separation of hunting and natural mortality: a comment

Article Abstract:

The modeling approach presented by Pollock et al. for analyzing band recovery data is evaluated. The model, which predicts that returns in the harvest of animals are classified as voluntary reported and solicited, offers many advantages. However, it fails to consider the information provided by the solicited bands in the model formulation. It is recommended that a sampling design and estimation procedure be developed to allow for temporal and geographic variations in reporting and solicitation rates.

Models, Mortality

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Evaluation of an aerial quadrat survey for monitoring wintering duck populations

Article Abstract:

An aerial survey to monitor wintering duck populations in Florida was undertaken, based on statistics from the entire distribution of ducks. The aim was to improve the reliability of the information already available on such populations. It was suggested that winter duck surveys should be spatially replicated, and replicates should be drawn randomly every year of the survey, so that serial correlation in the estimates is avoided.

Methods, Surveys, Habitats, Ducks, Animal populations, Aerial photogrammetry

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