DOI: 10.1016/j.foreco.2014.12.030
Scopus记录号: 2-s2.0-84921021409
论文题名: Timber harvest interacts with broad-scale forest mortality to affect site occupancy dynamics of a vertebrate seed predator
作者: Johnson T.N. ; Buskirk S.W. ; Hayward G.D. ; Raphael M.G.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2015
卷: 340 起始页码: 95
结束页码: 102
语种: 英语
英文关键词: Bark beetle
; Colonization
; Disturbance interactions
; Extinction
; Forest health
; Subalpine forest
Scopus关键词: Dynamics
; Ecology
; Ecosystems
; Harvesting
; Light extinction
; Site selection
; Timber
; Bark beetle
; Colonization
; Diameter-at-breast heights
; Ecological disturbance
; Environmental change
; Forest health
; Spatial heterogeneity
; Subalpine forests
; Forestry
; colonization
; coniferous tree
; environmental disturbance
; forest health
; granivory
; heterogeneity
; local extinction
; mortality
; Nearctic Region
; pest outbreak
; predator
; seed
; snag
; timber harvesting
; vertebrate
; Bark
; Cutting
; Insects
; Mountains
; Rocky Mountains
; United States
; Wyoming
; Dendroctonus
; Dryocoetes
; Sciuridae
; Scolytinae
; Tamiasciurus
; Tamiasciurus hudsonicus
; Vertebrata
英文摘要: Extensive ecological disturbances can interact with spatial heterogeneity produced by previous disturbances, influencing responses of vertebrates to environmental change. Recent and ongoing outbreaks of bark beetles (including Dendroctonus spp. and Dryocoetes confuses) in the Rocky Mountains produced an opportunity to investigate effects of broad-scale tree mortality on an important seed predator in Nearctic coniferous forests, the red squirrel (. Tamiasciurus hudsonicus), and to evaluate whether those effects interact with forest heterogeneity produced by previous timber harvest. Our study characterized site occupancy dynamics for red squirrels in relation to patch-cutting, a type of group-selection cut, and the bark-beetle outbreak, and evaluated whether patch cutting influenced subsequent effects of bark beetles on these squirrels. We used multi-season occupancy models and covariates for harvest- and outbreak-related habitat characteristics to describe extinction and colonization rates of red squirrels over a 27-yr period in Wyoming, USA. We observed effects of year, patch-cutting, and the bark beetle outbreak on the probability of detecting a red squirrel. We observed a negative association between local extinction rate and increasing snag density, but only to a threshold of 5 snags/0.04. ha. Local colonization rate was positively associated with the basal area of live trees. Annual site occupancy varied across years (range pre-harvest: 0.76-0.89; post-harvest: 0.84-0.99), and was lowest (0.70-0.72) during the two years sampling occurred approximately 14. years after the bark beetle outbreaks began. Tree mortality was lowest near patch cuts; this pattern was especially pronounced for mature trees (>30. cm diameter at breast height), which tend to produce the most cones and would likely contribute the most to red squirrel survival. Strong habitat effects on occupancy dynamics suggest that previously-harvested areas may provide refugia for red squirrels in post-outbreak forests. Our results support managing for uneven-aged stands of mixed species composition in subalpine forests of the Rocky Mountains. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65551
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Zoology and Physiology, University of Wyoming, Box 3166, Laramie, WY, United States; U.S. Forest Service, Alaska Region, 3301 C St., Anchorage, AK, United States; U.S. Forest Service, Pacific Northwest Research Station, 3625 93(rd) Ave. SW, Olympia, WA, United States
Recommended Citation:
Johnson T.N.,Buskirk S.W.,Hayward G.D.,et al. Timber harvest interacts with broad-scale forest mortality to affect site occupancy dynamics of a vertebrate seed predator[J]. Forest Ecology and Management,2015-01-01,340