Plot Mapping: Estimating Densities of Breeding Bird Territories by Combining Spot Mapping and Transect Techniques

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Abstract
Originally proposed by J. T. Emlen in 1977, plot mapping combines the accuracy of territory or spot mapping with the efficiency of transect or plot count techniques. This method can be used to estimate densities of animal species that advertise their presence on mutually exclusive territories. Plot mapping can be used with transects or sample plots, with fixed boundaries or species-specific variable boundaries. It is especially well suited for censusing breeding songbird communities. For each species, a probability of detection is estimated and subsequently used to adjust song counts to territories present. The variance of the density estimate provides a measure of its precision.

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