Record Details
Movements and habitat asociations of northern flying squirrels in the Central Oregon Cascades
ScholarsArchive at Oregon State University
| Field | Value |
|---|---|
| Title | Movements and habitat asociations of northern flying squirrels in the Central Oregon Cascades |
| Names |
Martin, Karl J.
(creator) Anthony, Robert G. (advisor) |
| Date Issued | 1994-10-31 (iso8601) |
| Note | Graduation date: 1995 |
| Abstract | We used radio-telemetry techniques to estimate home range size, movements, den sites, and habitat selection of 39 northern flying squirrels (Glaucomys sabrinus) in 2 old- and 2 second-growth stands in the central Oregon Cascades. Sampling periods were at night during summer and fall of 1991-92. Home ranges were smaller for female squirrels (3.9 ha, SE = 0.37) than male squirrels (5.9 ha, SE = 0.75); there was no detectable difference in home range size between stand types. Movements between successive, noncorrelated telemetry locations averaged 71 m (SE = 1.6 m; n = 1090) with no detectable differences between stand types or sexes. Northern flying squirrels had similar home range sizes, and movements in old- and second-growth coniferous forests of the central Oregon Cascades. Northern flying squirrel core-use areas (75% of the utilization area) were used to assess habitat selection in both old- and second-growth stands. Logistic regression procedures resulted in 1 significant microhabitat variable from the 22 variables measured in each stand type. In the old-growth stands, squirrels avoided areas with high proportions of large (.. 50 cm diameter) down wood (i = 0.0002). In the second-growth stands squirrels avoided areas with high densities of small (10 - 49 cm dbh) snags ( = 0.003). In the summer of 1992 we used daytime telemetry techniques to locate 42 den sites in an old-growth stand and 64 den sites in a second-growth stand. Den trees were larger than the average available den tree in each stand type. Den trees averaged 36.0 cm dbh (SE = 1.6 cm) in the second-growth stand and 101.0 cm (SE = 6.1 cm) in the old-growth stand. Squirrels did not seem to select snags for den sites more frequently than expected in either stand type, as other studies have suggested. |
| Genre | Thesis |
| Topic | Glaucomys -- Cascade Range |
| Identifier | http://hdl.handle.net/1957/9201 |
