Two general sampling designs were presented: the first assumed that animal tracks can be observed and followed both to the animal's location at the end of the snowstorm and to its present location the second assumed that the number of different animals encountered along a set of transects can be determined and that it is possible to get movement data from a random sample of radio-collared animals. Good snow conditions are defined to be fresh snow of sufficient depth so that presnowstorm and postsnowstorm animal tracks can be distinguished. His method requires that good snow conditions be present during the course of the survey and that all animal tracks intersected during the sampling process are observed. Becker's method provides a population estimate, so it is better than an index based on tracks. Charles Gowan, in Monitoring Vertebrate Populations, 1998 10.2.2.3 Line-Intercept Methodsīecker (1991) developed a method to estimate wolverine and lynx populations in Alaska using tracks in snow.
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