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Chemical similarity between introduced and native populations of Scots pine can facilitate transcontinental expansion of mountain pine beetle in North America
Biological Invasions ( IF 2.8 ) Pub Date : 2019-12-04 , DOI: 10.1007/s10530-019-02159-7
N. Erbilgin , J. G. Klutsch , H. Najeeb , J. A. Cale , G. Ishangulyyeva , R. Rajabzadeh , C. Boone , T. Bozic , G. Jansson , M. Haapanen , C. Hughes , C. J. K. MacQuarrie , M. Schroeder , R. Seppo

Abstract

Introduced forest tree species are frequently attacked by insects in their new range; however, it has been seldom investigated whether the presence of such tree species increases the risk of range expansion of native insect herbivores in the introduced range. European Scots pine has been introduced to North America including within a portion of the range of the mountain pine beetle (MPB). We investigated Scots pine suitability to MPB as a host in the introduced range of the pine populations. We compared chemotypic similarity of foliage between introduced and native Scots pine populations, and then determined the suitability of introduced populations to MPB. Suitability was assessed based on whether beetles produce aggregation pheromone components and complete development in Scots pine bolts. We also assessed whether or not suitability was affected by the host chemotypes. Introduced and native pine populations had the same sesquiterpene chemotypes and shared one of the two monoterpene chemotypes. All introduced populations were suitable for MPB but the suitability varied slightly with host chemotype. This is the first report of chemotypic variations of Scots pine populations outside its native range. Chemotypic similarity between the introduced and native pine populations, ability of beetles to produce pheromones and to complete its life cycle on bolts from all chemotypes, and preferential colonization of Scots pine over native pine species by MPB in field suggest that introduced Scots pine populations could facilitate transcontinental expansion of MPB in North America.



中文翻译:

引入的苏格兰松树种群和本地种群之间的化学相似性可以促进北美山地甲虫的跨大陆扩张

摘要

引进的林木物种经常受到新范围昆虫的攻击。但是,很少研究这种树种的存在是否会增加引入范围内的天然食草动物的范围扩大的风险。欧洲苏格兰松树已被引入北美,包括部分山松甲虫(MPB)。我们调查了在引入的松树种群中,苏格兰松树是否适合作为MPB宿主。我们比较了引进的和本地的苏格兰松树种群之间叶子的化学型相似性,然后确定了引入种群对MPB的适合性。根据甲虫是否会产生聚集信息素成分并在苏格兰松树松树螺栓中完全发育来评估其适用性。我们还评估了适应性是否受到宿主化学型的影响。引入的和天然的松树种群具有相同的倍半萜化学型,并具有两种单萜化学型之一。所有引入的种群均适合MPB,但适应性随宿主化学型而略有不同。这是关于苏格兰松树种群自然范围以外的化学型变异的首次报道。引入的和天然的松树种群之间的化学型相似性,甲虫在所有化学型的螺栓上产生信息素和完成其生命周期的能力,以及MPB在野外比本地的松树树种优先对苏格兰松树进行定殖,这表明引入的苏格兰松树种群可以促进MPB在北美的跨大陆扩张。引入的和天然的松树种群具有相同的倍半萜化学型,并具有两种单萜化学型之一。所有引入的种群均适合MPB,但适应性随宿主化学型而略有不同。这是关于苏格兰松树种群自然范围以外的化学型变异的首次报道。引入的和天然的松树种群之间的化学型相似性,甲虫在所有化学型的螺栓上产生信息素和完成其生命周期的能力,以及MPB在野外比本地的松树树种优先对苏格兰松树进行定殖,这表明引入的苏格兰松树种群可以促进MPB在北美的跨大陆扩张。引入的和天然的松树种群具有相同的倍半萜化学型,并具有两种单萜化学型之一。所有引入的种群均适合MPB,但适应性随宿主化学型而略有不同。这是关于苏格兰松树种群自然范围以外的化学型变异的首次报道。引入的和天然的松树种群之间的化学型相似性,甲虫在所有化学型的螺栓上产生信息素和完成其生命周期的能力,以及MPB在野外比本地的松树树种优先对苏格兰松树进行定殖,这表明引入的苏格兰松树种群可以促进MPB在北美的跨大陆扩张。所有引入的种群均适合MPB,但适应性随宿主化学型而略有不同。这是关于苏格兰松树种群自然范围以外的化学型变异的首次报道。引入的和天然的松树种群之间的化学型相似性,甲虫在所有化学型的螺栓上产生信息素和完成其生命周期的能力,以及MPB在野外比本地的松树树种优先对苏格兰松树进行定殖,这表明引入的苏格兰松树种群可以促进MPB在北美的跨大陆扩张。所有引入的种群均适合MPB,但适应性随宿主化学型而略有不同。这是关于苏格兰松树种群自然范围以外的化学型变异的首次报道。引入的和天然的松树种群之间的化学型相似性,甲虫在所有化学型的螺栓上产生信息素和完成其生命周期的能力,以及MPB在野外比本地的松树树种优先对苏格兰松树进行定殖,这表明引入的苏格兰松树种群可以促进MPB在北美的跨大陆扩张。

更新日期:2020-02-19
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