|SREL Reprint #0401|
Seasonal Abundance and Movement of Nine Species of Small Mammals
A. Briese and Michael H. Smith
Through the use of a drift fence with pitfall traps
and live trapping on a grid, movements of nine species of small mammals on and
surrounding an old field were recorded. Seasonal
trends in movement were apparent for all species for which sufficient data were
collected. There were significant
interspecific differences in timing and magnitude of movement.
Certain species occurred in almost all habitats while others were more
restricted in their distribution. Pitfall
traps are more sufficient than drop door live traps for shrews and their use
results in a greater diversity of small mammal captures in different habitats.
Evidence of extensive movement on the study area makes us question the
relatively static home range concept of the spatial distribution of mammals.
At certain times during the year animals appear to shift their centers of
activity to make optimum use of available cover.
From 22 to 50 per cent of all animals disappearing from the field were
emigrating; this percentage did not differ between adults and juveniles.
Using calcium as an example of elemental cycling, movements around the
edge of the field resulted in an average net gain of ten per cent of the
standing crop of this element per month.
SREL Reprint #401
Briese, L.A. and M.H. Smith. 1974. Seasonal abundance
and movement of nine species of small mammals. Journal of