The Effectiveness of Four Trap Types for Non-Volant Small Mammals: Large Sherman Livetraps, Standard Sherman Livetraps, Large Snap traps, and Pitfall Traps
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Small mammal studies depend upon an ability to conduct a representative survey of the species and the density of individuals of a study site. The selection of trap type is, therefore, an important aspect of these studies. We compared four trap types and examined their effectiveness in catching non-volant small mammals in Rocky Mountain National Park (RMNP) and Roosevelt National Forest (RNF). Trapping was conducted in linear transects of 60 traps: 30 standard Sherman livetraps, 10 large Sherman live traps, 10 large snaptraps, 10 pitfall traps. Large snaptraps had the largest ratio of total captures to total number of traps (11.7). Large snap traps and large Sherman livetraps had higher ratios for the majority of the species sampled. Large snaptraps were concluded to be the most efficient method of sampling small mammal populations when a greater quantity of specimens is desired. However, a combination of large snap traps and large Sherman livetraps may be most effective when sampling the species of small mammals found within Rocky Mountain National Park and Roosevelt National Forest and may be preferred in the interest of conservation of these species. Future studies could examine the effectiveness of different combinations of trap types.
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