The effectiveness of tape playback in estimating black rail density

Article Abstract:

The vocal responses and movements of radiotagged black rails to playback of vocalizations at two sites in Florida during the breeding seasons of 1992-95 were measured to determine the effectiveness of playback surveys in providing population density estimates and to refine survey methodology for black rails. Nonnesting male black rails were found to be the most likely to respond to playback. In contrast, the least likelihood of response to playback was observed among nesting females. Linear regression data showed that month, temperature and month x year were significant sources of variation.

Measurement, Population density, Rails (Birds)

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Monitoring songbird population change with autumn mist netting

Article Abstract:

Changes in numbers of North American songbirds are monitored with the breeding bird survey (BBS) method, although there are gaps in such a roadside survey. Counting birds during migration is a possible way of filling such gaps. A study to determine a correlation between the numbers of birds captured during autumn mist-netting and trends found by the BBS. A positive correlation was found with trends in BBS data, suggesting that intensive and standardized netting is useful as a population monitoring method.

Bird migration

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Uneven rates of landscape change as a source of bias in roadside wildlife surveys

Article Abstract:

A study determined if roadside wildlife survey data are accurate in assessing species occurrence and population trends of birds. Results suggest possible biases in the surveys due to uneven and rapid rates of landscape change.

Environmental aspects, Landscape changes

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