Forest-floor Disturbance Reduces Chipmunk (Tamias spp.) Abundance Two Years after Variable-retention Harvest of Pacific Northwestern Forests Public Deposited

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http://ir.library.oregonstate.edu/concern/articles/df65v944v

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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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  • 89
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