|SREL Reprint #0282|
of Assessment Lines to Estimate Density of Small Mammals
W. Kaufman, Gary C. Smith, R. Marie Jones, John B. Gentry and Michael H. Smith
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,
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.