DOI: 10.1016/j.foreco.2017.05.044
Scopus记录号: 2-s2.0-85020031090
论文题名: Pyrrhic victory for bark beetles: Successful standing tree colonization triggers strong intraspecific competition for offspring of Ips sexdentatus
作者: Pineau X. ; Bourguignon M. ; Jactel H. ; Lieutier F. ; Sallé A.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 399 起始页码: 188
结束页码: 196
语种: 英语
英文关键词: Brood productivity
; Critical threshold of attack densities
; Fitness
; Pinus pinaster
Scopus关键词: Health
; Productivity
; Brood productivity
; Critical threshold
; Fitness
; Intraspecific competition
; Larval development
; Maritime pine stands
; Natural resistance
; Pinus pinaster
; Forestry
; beetle
; brood rearing
; colonization
; coniferous forest
; fitness
; hypothesis testing
; intraspecific competition
; larval development
; rearing
; threshold
; tolerance
; Coleoptera
; Ips sexdentatus
; Pinus pinaster
; Scolytinae
英文摘要: Most bark beetles living on standing trees must overcome the natural resistance of their host to succeed in colonization. For this they perform mass attacks to reach a critical threshold of attack density (CTAD) above which host defences are exhausted. However, this strategy can result in an intense intraspecific competition during larval development. Consequently, the ability of a bark beetle species to sustain outbreaks on standing trees would be conditioned by three key factors: the value of CTAD; the ability of attacking beetles to stop accumulating after CTAD has been reached; and the ability of offspring to tolerate intraspecific competition. To test these hypotheses, we assessed attack and colonization densities of Ips sexdentatus during an outbreak, and estimated CTAD, using a stand-scale approach, in nine maritime pine stands. We also estimated the effect of intraspecific competition on the productivity and fitness of I. sexdentatus offspring, testing increasing rearing densities in the laboratory. The overall CTAD of I. sexdentatus on standing maritime pines was 142 attacks/m2. CTAD varied among stands and ranged from 53 to 177 attacks/m2. In several stands, attack densities raised much above local CTAD. Ips sexdentatus exhibited a low tolerance to intraspecific competition. The number of offspring per female and the fitness of emerging adults decreased exponentially with increasing rearing density. Excessive attack densities and negative feedback on offspring quantity and quality are likely to trigger rapid collapse of outbreaks. This supports the prediction that I. sexdentatus is an opportunistically aggressive species. © 2017 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64264
Appears in Collections: 影响、适应和脆弱性
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作者单位: Laboratoire de Biologie des Ligneux et des Grandes Cultures, INRA, Université d'Orléans, Orléans, France; BIOGECO, INRA, Université de Bordeaux, Cestas, France
Recommended Citation:
Pineau X.,Bourguignon M.,Jactel H.,et al. Pyrrhic victory for bark beetles: Successful standing tree colonization triggers strong intraspecific competition for offspring of Ips sexdentatus[J]. Forest Ecology and Management,2017-01-01,399