The Cooperative Wildlife Research units, working closely with State Game and Fish Departments, are actively 

 studying deer and other big game in nearly all of these cooperative programs. Here, graduate students of the 

 Arizona Unit are taking data from a whitetail buck. ( Photo by C. R. Hungerford) 



ISiOOO-acre tract of forest and range land where 

 vegetation changes will be correlated with changes 

 in wildlife number.? and use. 



Sampling techniques developed for menxurlng 

 acot'n yields. — Personnel of the Southern Forest 

 Experiment Station and the Denver Center have 

 developed a technique for sampling aconi yields 

 from individual trees. The study revealed that 35 

 percent of the acorns fell two-thii'ds of the crown 

 radius from the truiilc, and further indicated that 

 the fall could be adequately sampled by random 

 location of three ti-ajjs at the two-thirds-crown 

 radius from the trunk. 



Browse increased with timber cutting. — A Bu- 

 reau biologist has reported substantial gains in 

 available deer browse with various cutting methods 

 in mixed conifer swamps in upper Michigan. Nine 



years after cutting, the yield was 46 pounds per 

 acre in the light-selection cutting, 130 in the diam- 

 eter-limit cutting, 134 in the block cutting, 161 in 

 the strip cutting, and 184 in the shelterwood 

 cutting, compared with only 18 pounds per acre on 

 the uncut control area. Distribution of pellet 

 counts and utilization of browse during the winter 

 indicated that, from the standpoint of deer man- 

 agement, shelterwood cutting in strips would per- 

 haps be best. This would combine optimum 

 browse production in proximity to cover. 



Snap-trap catches give esfinuites of sniaJl-mam- 

 mal poinilations. — Biologists have long relied on 

 live-trapping in grid pattern as the principal 

 method of estimating small-mammal populations. 

 In fact, there has been some question whether re- 

 sults from snap-trapping, as used in the Annual 



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