DOI: 10.1016/j.foreco.2017.03.024
Scopus记录号: 2-s2.0-85017139403
论文题名: Emerald ash borer biocontrol in ash saplings: The potential for early stage recovery of North American ash trees
作者: Duan J.J. ; Bauer L.S. ; Van Driesche R.G.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 394 起始页码: 64
结束页码: 72
语种: 英语
英文关键词: Hymenoptera
; Invasive
; Life table
; Natural enemies
; Parasitism
; Predation
; Wood borer
Scopus关键词: Biocontrol
; Gems
; Population statistics
; Recovery
; Hymenoptera
; Invasive
; Life table
; Natural enemies
; Parasitism
; Predation
; Forestry
; Agrilus planipennis
; Fraxinus
; Hymenoptera
; Tetrastichus
英文摘要: In many parts of North America, ash (Fraxinus) stands have been reduced by the emerald ash borer (Agrilus planipennis) invasion to a few surviving mature trees, saplings, basal sprouts, and seedlings. Without a soil seed bank for Fraxinus spp., tree recovery will require survival and maturation of these younger cohorts to reproductive age. Here we report and analyze the population dynamics of emerald ash borer and its associated natural enemies in ash saplings (2.5–5.8 cm DBH) in six deciduous forest stands in southern Michigan. At these sites, the outbreak population of the pest collapsed during the study, and a biocontrol agent introduced from China, the larval parasitoid Tetrastichus planipennisi, became widely established and increased in rates of parasitism. To assess the potential for ash recovery in these stands, we also quantified the abundance and crown condition of the ash saplings and surviving ash trees at the study sites. We found that T. planipennisi was the dominant biotic mortality factor in saplings, killing 36–85% of the late instar borer larvae. Neither woodpecker predation nor native parasitoids caused more than minor levels (<20%) of borer mortality in saplings. Life table analyses of these data further showed that the net population growth rate of the pest in saplings was near or under replacement levels, and that the introduced biocontrol agent reduced the pest's net population growth rate in saplings at our study sites by over 50%. In addition, stand inventories found that healthy ash saplings (4–16 per 100 m2) and smaller (pole size) trees (2–9 per 100 m2) remained in the six study sites, despite an early high density population of the pest at the sites. These findings indicate that the introduced biocontrol agent T. planipennisi is providing significant biocontrol services, enhancing ash survival and promoting recovery of the ash in southern Michigan. © 2017 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64364
Appears in Collections: 影响、适应和脆弱性
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作者单位: United States Department of Agriculture, Agricultural Research Service, Beneficial Insects Introduction Research Unit, Newark, DE, United States; United States Department of Agriculture Forest Service, Northern Research Station, Lansing, MI, United States; Department of Environmental Conservation, University of Massachusetts, Amherst, MA, United States
Recommended Citation:
Duan J.J.,Bauer L.S.,Van Driesche R.G.. Emerald ash borer biocontrol in ash saplings: The potential for early stage recovery of North American ash trees[J]. Forest Ecology and Management,2017-01-01,394