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- We evaluated the two-year effects of variable-retention harvest on chipmunk (Tamias spp.) abundance (Nˆ ) and habitat in
mature coniferous forests in western Oregon and Washington because wildlife responses to density/pattern of retained
trees remain largely unknown. In a randomized complete-block design, six treatments were applied to 13-ha units at three
sites (blocks): four retention levels of original basal area (BA) in an aggregated tree pattern (100, 75, 40, and 15%) and
two retention levels in a dispersed tree pattern (15 and 40%). Log-yarding method differed at each site (suspension cable,
shovel-loader, or helicopter). We used an information-theoretic approach to compare six candidate regression models for
their ability to predict treatment responses of chipmunk Nˆ and associated habitat variables. Chipmunk Nˆ had a positive
linear relationship with retention level that predicted a 50% reduction in abundance as % BA retention decreased from 100
to 15% (R2 = 0.36). Disturbed soil cover was strongly related to the interaction of retention level and block (i.e., yarding
method and other site-level differences) (R2 = 0.82), and the model predicted disproportionately greater disturbed area for
cable yarding (16%) than for shovel (10%) or helicopter (6%) methods as retention decreased from 100 to 15%. Chipmunk
Nˆ
had a negative linear relationship with disturbed soil cover that predicted a 70% reduction in the species’ abundance
as disturbed area increased from 0 to 16% (R2 = 0.53). Retention level and yarding method are important considerations
when planning harvesting operations because of their potential impacts to small mammal populations.
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- Wilk, R. J., Harrington, T. B., Gitzen, R. A., & Maguire, C. C. (2015). Forest-Floor Disturbance Reduces Chipmunk (Tamias spp.) Abundance Two Years after Variable-Retention Harvest of Pacific Northwestern Forests. Northwest Science, 89(1), 75-92. doi:10.3955/046.089.0106
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