The influence of variation in host tree monoterpene composition on secondary attraction by an invasive bark beetle: Implications for range expansion and potential host shift by the mountain pine beetle
The influence of variation in host tree monoterpene composition on secondary attraction by an invasive bark beetle: Implications for range expansion and potential host shift by the mountain pine beetle
复制标题
DOI：
10.1016/j.foreco.2015.09.044
复制
发表时间：
2016-01-01
影响因子：
3.7
通讯作者：
Carroll, Allan L.
中科院分区：
文献类型：
--
作者：
Burke, Jordan L.;Carroll, Allan L.
近年来，山地松甲虫（Dendroctonus ponderosae）的范围已经扩大到加拿大西部的许多进化幼稚森林。这些森林包括主要宿主物种的新种群，小杆松（Pinus contorta），新物种短叶松（Pinus banksiana）及其杂交种（P. contorta x P. banksiana）。这些新的森林在化学和物理上都不同于原生森林，最近的研究表明，甲虫的繁殖性能在这些新的栖息地得到了提高。我们进行了一项田间试验，以确定不同的主机化学，特别是α-蒎烯含量，二次吸引觅食山松甲虫的效果。α-蒎烯是产生反式马鞭草烯醇的前体分子，反式马鞭草烯醇是该甲虫物种的主要聚集信息素。我们发现，相对浓度升高的a-蒎烯螺栓显着增加其吸引力，在原地山松甲虫。75%的攻击被发现在与其他单萜相对最多的a-蒎烯感染螺栓。螺栓类型之间的萜烯化学的其他措施不能解释的攻击模式。这一结果表明，高浓度的α-蒎烯可以增加聚集率和攻击成功的山松甲虫在新的松树林。据报道，在西部北方森林中新入侵的杂交松和短叶松含有3-4倍的a-蒎烯的相对浓度比在森林中的小孢子虫已经共同进化。这些高浓度可能有助于山松甲虫克服一些潜在的限制建立和传播的北方森林，如低松量和连接，并继续扩大其范围。皇冠版权所有（C）2015由Elsevier B. V.出版。保留所有权利。
The range of mountain pine beetle (Dendroctonus ponderosae) has expanded in recent years to include many evolutionarily naive forests in western Canada. These forests include novel populations of the principal host species, lodgepole pine (Pinus contorta), the novel species jack pine (Pinus banksiana), and their hybrids (P. contorta x P. banksiana). These novel forests are chemically and physically different than native forests, and recent studies have shown beetle reproductive performance is enhanced in these novel habitats. We conducted a field experiment to determine the effect of differing host chemistry, specifically alpha-pinene content, on secondary attraction by foraging mountain pine beetles. Alpha-pinene is the precursor molecule for the production of trans-verbenol, the main aggregation pheromone for this beetle species. We found that elevated relative concentrations of a-pinene in bolts significantly increased their attractiveness to in situ mountain pine beetles. Seventy-five percent of attacks were found on infested bolts with the most a-pinene relative to other monoterpenes. Other measures of terpene chemistry between bolt types could not explain the pattern of attacks. This result suggests that elevated concentrations of a-pinene could increase the rate of aggregation and attack success by the mountain pine beetle in novel pine forests. Newly invaded hybrid and jack pine in the western boreal forest are reported to contain 3-4 times the relative concentration of a-pinene than lodgepole pines in forests in which the beetle has coevolved. These elevated concentrations may help the mountain pine beetle overcome some of the potential restraints for establishment and spread in the boreal forest, such as low pine volume and connectivity, and continue expanding its range. Crown Copyright (C) 2015 Published by Elsevier B.V. All rights reserved.