DOI: 10.1016/j.foreco.2016.04.052
Scopus记录号: 2-s2.0-84989937776
论文题名: Timber harvest and tree size near nests explains variation in nest site occupancy but not productivity in northern goshawks (Accipiter gentilis)
作者: Rodriguez S.A. ; Kennedy P.L. ; Parker T.H.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2016
卷: 374 起始页码: 220
结束页码: 229
语种: 英语
英文关键词: Forest management
; Mature forest
; Meta-analysis
; Occupancy
; Productivity
; Raptor
Scopus关键词: Harvesting
; Productivity
; Timber
; Average size
; Effect size
; Mature forest
; Meta analysis
; Occupancy
; Raptor
; Site occupancy
; Timber harvests
; Forestry
; Accipiter gentilis
; Raptores
英文摘要: Conservation concern for the northern goshawk (Accipiter gentilis) reflects evidence that goshawks may abandon nest sites or suffer from reduced nesting success in response to some forms of timber harvest. However, this evidence is mixed and has yet to be reviewed systemically and quantitatively. Therefore, we conducted a meta-analysis to assess the extent to which timber harvest and tree size explain variation in goshawk productivity and site occupancy. Goshawk productivity was not significantly explained by the presence of nearby timber harvest nor by the average size of nearby trees either in North America or in Eurasia or when averaged across all studies. Effect sizes differed dramatically among studies and the average effect size was close to zero (Zr = 0.04). However, timber harvest and tree size together more strongly explained goshawk occupancy of nest sites or territories. Within studies, goshawk nest sites or territories with less timber harvest nearby or relatively larger trees were, in most cases, more likely to be occupied. When we estimated average effect sizes separately for the two continents, the averages were moderate, consistent (Zr = 0.23–0.27), and significantly > 0. When we combined studies from North America and Eurasia, average effect sizes for timber harvest (Zr = 0.24) and tree size (Zr = 0.25) were similar in strength and both significantly > 0. Thus taken together, our results suggest that although both timber harvest and a lack of large trees are associated with lower occupancy by nesting goshawks, pairs that nest near timber harvest or in small trees have indistinguishable nesting success from pairs nesting in large trees or farther from timber harvest. We found substantial heterogeneity in results among studies, especially within North America, which is not surprising given that studies differed greatly in research methods, forest type, and forest management. In conclusion, our results suggest goshawk nest sites in populations of conservation concern, such as A. g. laingi, may need more protection from timber harvest than they are currently receiving. Equally important, to better understand effects of forest management on goshawks, we recommend additional studies designed to: (1) better identify the spatial and temporal extent of the effect of timber harvest on goshawk site occupancy; and (2) determine what goshawks do and where they go after a timber harvest. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64862
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Biology, Whitman College, Walla Walla, WA, United States; Eastern Oregon Agriculture and Natural Resource Program, Department of Fisheries and Wildlife, Oregon State University, Union, OR, United States
Recommended Citation:
Rodriguez S.A.,Kennedy P.L.,Parker T.H.. Timber harvest and tree size near nests explains variation in nest site occupancy but not productivity in northern goshawks (Accipiter gentilis)[J]. Forest Ecology and Management,2016-01-01,374