气候变化领域集成服务门户(CCPortal): Spatial genetic structure at the leading edge of a spruce budworm outbreak: The role of dispersal in outbreak spread

CCPortal

DOI	10.1016/j.foreco.2020.117965
	Spatial genetic structure at the leading edge of a spruce budworm outbreak: The role of dispersal in outbreak spread
	Larroque J.; Johns R.; Canape J.; Morin B.; James P.M.A.
发表日期	2020
ISSN	0378-1127
卷号	461
英文摘要	Outbreaking insects often undergo rapid population growth synchronously in multiple locations separated by large distances. Dispersal may play an essential role in synchronizing outbreaks over large geographic areas but its role in outbreak spread remains unclear. In our study, we used population genetics to assess how much dispersal contributes to the spread of a major forest pest, the spruce budworm (Choristoneura fumiferana Clemens). Using spatial analyses of genotypic data, we determined the extent to which dispersing individuals from epidemic populations in Quebec leave their genetic signature in adjacent, rising populations in New Brunswick and Maine. A lack of genetic differentiation between endemic and epidemic populations would indicate that outbreak spread depends on effective dispersal from epidemic to endemic regions. In contrast, endemic populations that are distinct from epidemic population would suggest that dispersal plays a reduced role in fomenting outbreak rise. An intermediate possibility with differentiation between epidemic and endemic population as a continuous spatial gradient might suggest a temporal lag in genetic differentiation that may take the form of a genetic travelling wave. PCA, cluster analyses, isolation by distance, and sPCA were used to characterize spatial genomic variation using 300 SBW larvae sampled in 2015 and genotyped at thousands of genome-wide SNPs. We found support for a genetic travelling wave pattern, matching the SBW density pattern. These results indicate that dispersal may trigger the transition of populations from the endemic to the epidemic state and thereby drive outbreak spread. By supplementing persisting endemic populations, migrants may drive populations to beyond levels that can be controlled by local biotic constraints. These results support the underlying justification of ongoing outbreak containment efforts in Atlantic Canada (i.e., the Early Intervention Strategy), although continued sampling as the outbreak progresses is needed confirm the temporal stability of the observed patterns. © 2020
英文关键词	Connectivity; Dispersal; Early intervention; Insect outbreak; SNP; Spatial genetics
语种	英语
scopus关键词	Chromosomes; Cluster analysis; Digital storage; Epidemiology; Forestry; Wave transmission; Connectivity; Dispersal; Early intervention; Insect outbreaks; Spatial genetics; Population statistics; connectivity; dispersal; epidemic; genetic differentiation; genetic structure; pest outbreak; population genetics; population growth; population outbreak; spatial analysis; Chromosomes; Differentiation; Edges; Forestry; Genetics; Patterns; Spruce Budworm; Waves; Canada; Maine; New Brunswick; Quebec [Canada]; United States; Choristoneura fumiferana; Hexapoda
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/155430
作者单位	Département de Sciences Biologiques, Université de Montréal, Montréal, QC, Canada; Canadian Forest Service, Natural Resources Canada, Fredericton, NB, Canada; raduate Department of Forestry, University of Toronto. TorontoON, Canada
推荐引用方式 GB/T 7714	Larroque J.,Johns R.,Canape J.,et al. Spatial genetic structure at the leading edge of a spruce budworm outbreak: The role of dispersal in outbreak spread[J],2020,461.
APA	Larroque J.,Johns R.,Canape J.,Morin B.,&James P.M.A..(2020).Spatial genetic structure at the leading edge of a spruce budworm outbreak: The role of dispersal in outbreak spread.Forest Ecology and Management,461.
MLA	Larroque J.,et al."Spatial genetic structure at the leading edge of a spruce budworm outbreak: The role of dispersal in outbreak spread".Forest Ecology and Management 461(2020).