Line transect method of estimating grouse population densities.

摘要: SUMMARY A new estimator is proposed for estimating ruffed grouse population densities by the line transect method of sampling. The estimator, utilizing only right angle distances from observer to sighted animal, shown be approximately unbiased and an approximate variance provided in explicit form. Both its are dependent on specified assumptions. expected length necessary sample exactly n' animals derived and, 2-stage sampling, additional miles achieve a predetermined precision. authors examine data years 1950-58 taken at Cloquet, Minnesota, (Bonasa umbellus) compare calculated with estimated previously published Hayne, King, Webb estimators method. underlying assumptions discussed several tested these as well more extensive data.