SREL Reprint #0282

 

 

 

Use of Assessment Lines to Estimate Density of Small Mammals

Donald W. Kaufman, Gary C. Smith, R. Marie Jones, John B. Gentry and Michael H. Smith

 

Abstract

Removal trapping along three sets of lines was used to estimate density of small mammals in the lowland mesic-hardwood forest.  Traps were checked on the octagon census lines for 28 days, on the primary assessment lines for a second 28 day period, and on the secondary assessment lines and the octagon census lines during a final 28 day period.  Primary assessment lines were placed across the octagon census lines while the secondary assessment lines were placed across the primary assessment lines.  Linear regression equations were fitted to accumulative captures over distance for the primary assessment lines and the secondary assessment lines to determine the area of effect around the octagon census lines and a selected portion of the primary assessment lines, respectively.

Linear regression equations were also used to estimate numbers of small mammals in the two areas of effect when the methods of Hayne (1949) and Janion, Ryszkowski & Wierzbowska (1968) could not be used to estimate number.  Using the estimated areas of effect and numbers, density estimates in the area of effect of the octagon census lines were 2.7-2.0 P. gossypinus/ha, 3.7-3.9 O. nuttalli/ha, and 1.3-1.4 B. brevicauda/ha.  Density estimates in the area of effect along the selected portion of the primary assessment lines were 7.4-9.8 u/ha, 5.4-7.1 O. nuttalli/ha, and 1.7-2.2 B. breviauda/ha.

 

SREL Reprint #0282

Kaufman, D.W., G.C. Smith, R.M. Jones, J.B. Gentry, and M.H. Smith. 1971. Use of assessment lines to estimate density of small mammals. Acta Theriologica 16:127-147.

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