Behavioral and Genetic Diversity during Dispersal: Analysis of a Polymorphic Esterase Locus in Southern Pine Beetle, Dendroctonus frontalis
Behavioral and Genetic Diversity during Dispersal: Analysis of a Polymorphic Esterase Locus in Southern Pine Beetle, Dendroctonus frontalis
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传播过程中的行为和遗传多样性：南方松甲虫 Dendroctonus frontalis 多态性酯酶基因座的分析
DOI：
10.1093/ee/11.5.1014
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发表时间：
1982
影响因子：
1.7
通讯作者：
J. Coster
中科院分区：
文献类型：
--
作者：
L. Florence;Paul C. Johnson;J. Coster
环绕。Entomol。（1982）南松甲虫（鞘翅目：鞘翅科）对合成聚集信息素（frontalin）的扩散行为随着离羽化地的距离的增加而呈指数递减。淀粉凝胶电泳分析发现，在多态酯酶位点上，不同基因型在扩散过程中的反应存在差异。这些差异所产生的等位基因分布预示着遗传多样性的增加与源种群扩散距离的增加同时发生。南松甲虫（Dendroctonusfron - talis zimunnan）是分布于美国南部、墨西哥、危地马拉、洪都拉斯和亚利桑那州的主要害虫。虽然已知种群总数每年都有剧烈波动，但在一些森林中，例如在德克萨斯州东部，流行程度保持了20年之久（德克萨斯州林务局，1978年）。SPB种群的分散为研究主动分散时期的变异提供了一个独特的机会。种群向新的繁殖栖息地（即松树寄主韧皮部）的聚集受到由Frontalin （SPB产生）和a-蒎烯（寄主树产生）组成的虫素系统的调节（Kinzer et al. 1969）。大量的研究工作致力于研究美国南部特别保护区的人口动态和经济影响；直到最近，人们才注意到松甲虫种群所保持的遗传变异（Anderson et al. 1979, Namkoong et al. 1979）。本研究的主要目的是：(1)表征SPB对一系列以距离梯度排列的合成聚集信息素源的传播行为；(2)分析响应种群内和种群间的遗传变异分布；(3)研究龙茅传播行为与遗传变异维持之间可能存在的关系。本研究首次尝试同时观察松甲虫在信息素介导的主动扩散过程中的行为和分散种群间分配的遗传变异。
Environ. Entomol. II: 1014-1018 (1982) Dispersal behavior of the southern pine beetle, Dendroctonus frontalis Zimmermann (Coleoptera: Scolytidae), in response to synthetic aggregating pheromone (frontalin) indicates an exponential decrease in response with distance from the site of emergence. Differential response during dispersal among genotypes at a polymorphic esterase locus was found by using starch gel electrophoresis. These differ ences produced allelic distributions that predict increased genetic diversity concurrent with increasing dispersal distance from the source population. The southern pine beetle (SPB), Dendroctonusfron talis Zimmennan (Coleoptera: Scolytidae), is regarded as a major insect pest among Pinus spp. of the southern United States, Mexico, Guatemala, Honduras, and Ar izona. Though total population numbers are known to fluctuate drastically from year to year, epidemic levels have been maintained in some forests, such as in eastern Texas, for up to 20 years (Texas Forest Service 1978). Dispersing populations of SPB offer a unique oppor tunity for studying variability during active dispersal ep isodes. Aggregation of populations to new breeding habitats (i.e., pine host phloem) are regulated by a pher omone system composed of Frontalin (SPB produced) and a-pinene (host tree produced) (Kinzer et al. 1969). Considerable research effort has been devoted to studying the population dynamics and economic impact of the SPB in the southern United States; only recently has attention been given to the genetic variation main tained by pine beetle populations (Anderson et al. 1979, Namkoong et al. 1979). The principle objectives of this study were: (I) to characterize SPB dispersal behavior in response to a series of synthetic aggregation pheromone sources aligned in a distance-gradient, (2) to analyze the distribution of genetic variation within and among the responding pop ulations, and (3) to study possible relationships which may exist between dispersal behavior and the mainte nance of genetic variation in D. frontalis. This study represents the first attempt to simultaneously observe pine beetle behavior during active, pheromone-mediated dispersal and the genetic variation allocated among the dispersed population.