摘要
The population situation of Tibetan Snowcock (Tetragallus tibetanus) has been surveyed by line transect sampling in Tibet from 1987 to 1989. The total length of samplings is 4444km, which were arranged in an area of 1 million.km2. 783 snowcocks were recorded in 35 line transects of 408km in the effective length. From these data, the densities of the snowcocks were estimated from negative exponential density distribution and jackknife method. The average density is 1.4523 cocks/ km2 and varies from 5.6580 to 0.0697 indiv. -km2. The population size of the snowcocks is 187.303±24.781 cocks in Tibet. In this paper, the author also discussed how to locate the line transect samplings, determine the observation width, choose possible shapes of the detection function and calculate the habitat size.
The population situation of Tibetan Snowcock (Tetragallus tibetanus) has been surveyed by line transect sampling in Tibet from 1987 to 1989. The total length of samplings is 4444km, which were arranged in an area of 1 million.km2. 783 snowcocks were recorded in 35 line transects of 408km in the effective length. From these data, the densities of the snowcocks were estimated from negative exponential density distribution and jackknife method. The average density is 1.4523 cocks/ km2 and varies from 5.6580 to 0.0697 indiv. -km2. The population size of the snowcocks is 187.303±24.781 cocks in Tibet. In this paper, the author also discussed how to locate the line transect samplings, determine the observation width, choose possible shapes of the detection function and calculate the habitat size.
