|SREL Reprint #0284|
Distances Moved by Small Mammals as an Apparent Function of Grid Size
Barry F. Gaust, Michael H. Smith and W. Bradley WRAY
Live traps were use don a
26 x 26 grid (14.1 ha) to determine the movement patterns of three species of
small mammals in a lowland mesic-hardwood forest. Blarina breviauda moved an average of 94.7 m
between successive captures, Ochrotomys nuttalli 72.8 m and Peromyscus
gossypinus 54.0 m. These
data are not consistent with Calhoun’s theory of social dominance.
Linear relationships are given for predicting home range size as
calculated by several different methods from average distance between captures.
A new way of depicting the distribution of distances between captures is
given. Movement son the middle 16 x
16 grid compared to those on the 26 x 26 grid were 19.4% shorter for O. nuttalli
and 25.1% shorter for P. gossypinus. Longer movements are extending the area of effect around a
census grid or line farther than might be expected from data collected on
smaller study plots. Thus, an
upward bias is introduced into most density estimates.
SREL Reprint #0284
Faust, B.F., M.H. Smith, and W.B. Wray. 1971.
Distances moved by small mammals as an apparent function of
grid size. Acta Theriologica 11:161-177.