Comparison of Methods for Estimating Bird Abundance and Trends From Historical Count Data
作者： Frank R. Thompson , Frank A. La Sorte
DOI: 10.2193/2008-135
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摘要: Abstract The use of bird counts as indices has come under increasing scrutiny because assumptions concerning detection probabilities may not be met, but there also seems to some resistance model-based approaches estimating abundance. We used data from the United States Forest Service, Southern Region monitoring program compare several common for annual abundance or and population trends point-count data. compared estimated means a mixed-Poisson model estimates count-removal with 3 time intervals distance bands. trend calculated an autoregressive, exponential fit above methods by directly treating year continuous covariate in model. produced 6 forest songbirds based on average 621 459 points ...
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