Abstract
Incidental to an investigation of factors affecting the regeneration of northern white cedar, Thuja occidentalis , following lumbering, the writer observed what appears to be an unusual instance of local extremes in abundance of masked shrews, Sorex cinereus , near Shingleton, Michigan. Since little is known concerning the ecology and population dynamics of soricids, the observations reported here may be noteworthy. Primarily, the study was designed to provide information on species composition and comparative densities of small mammals on two forest plots, the Star Siding and Petrel Grade cedar-cutting projects. A total of 58 Museum Special snap traps were distributed in systematic grid pattern in each area. Due to differences of size and configuration between the cutting plots, traps were located at intervals of 66 × 132 feet at Star Siding and twice this spacing at Petrel Grade. Trapping began on August 15, 1955, and continued for four and five days on each area. Only a few rodents were …
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