The home range of stoats (Mustela erminea) was
determined as part of a programme to protect Okarito brown kiwi chicks
(Apteryx australis) ‘Okarito’, from
predation. Twenty-seven stoats were fitted with radio-transmitters and tracked
in two podocarp (Podocarpaceae) forests, in south Westland, New Zealand, from
July 1997 to May 1998. Home-range area was determined for 19 animals by
minimum convex polygons and restricted-edge polygons, and core areas were
determined by hierarchical cluster analysis. The mean home ranges of males
across all seasons calculated by minimum convex polygon (210 28 ha ( s.e.))
and restricted-edge polygon (176 29 ha) were significantly larger than those
of females across all seasons (89 14 ha and 82 12 ha). The mean home range of
males calculated by minimum convex polygon during the breeding season (256 38
ha) was significantly larger than the mean home range pooled across the
non-breeding seasons (149 16 ha), whereas that calculated by restricted-edge
polygon was not significantly different. The mean home range of females during
the breeding season was not significantly different from that in the
non-breeding seasons when estimated by either method. Overlap of home ranges
was observed within and between sexes in all seasons, with the greatest
proportion of home range overlap being male–female. The mean home range
of females in spring and summer is used to guide the spacing of control
stations.