Storer Caroline, Payton Adam, McDaniel Stuart, Jordal Bjarte, Hulcr Jiri
School of Forest Resources and Conservation Institute of Food and Agricultural Sciences University of Florida Gainesville FL USA.
Biology Department University of Florida Gainesville FL USA.
Ecol Evol. 2017 Nov 12;7(24):10974-10986. doi: 10.1002/ece3.3625. eCollection 2017 Dec.
Each year new exotic species are transported across the world through global commerce, causing considerable economic and ecological damage. An important component of managing invasion pathways is to identify source populations. Some of the most widespread exotic species are haplodiploid ambrosia beetles. The ability to mate with siblings (inbreed) and their transportable food source (symbiotic fungus) have enabled them to colonize most of the world and become pests of plant nurseries, lumber, and forests. One of the fastest spreading ambrosia beetles is . In order to discover the source populations of this globally invasive species, track its movement around the world, and test biogeographical scenarios, we combined restriction site-associated DNA sequencing (RADseq) with comprehensive sampling across the species native and introduced range. From 1,365 genotyped SNP loci across 198 individuals, we determined that in its native range, is comprised of a population in Southeast Asia that includes mainland China, Thailand, and Taiwan, and a second island population in Japan. North America and Central America were colonized from the island populations, while Africa and Oceania were colonized from the mainland Asia, and Hawaii was colonized by both populations. Populations of in North America were genetically diverse and highly structured, suggesting (1) numerous, repeated introductions; (2) introduction of a large founding population; or (3) both scenarios with higher than expected outcrossing. , other wood-boring insects, and indeed many other pests with unusual genetic structure continue to spread around the world. We show that contemporary genetic methods offer a powerful tool for understanding and preventing pathways of future biosecurity threats.
每年都有新的外来物种通过全球商业活动被运往世界各地，造成相当大的经济和生态破坏。管理入侵途径的一个重要组成部分是确定源种群。一些分布最广泛的外来物种是单倍体二倍体食菌小蠹。与兄弟姐妹交配（近亲繁殖）的能力以及它们可携带的食物来源（共生真菌）使它们能够在世界大部分地区定殖，并成为植物苗圃、木材和森林的害虫。传播速度最快的食菌小蠹之一是 。为了发现这种全球入侵物种的源种群，追踪其在全球的移动，并测试生物地理情景，我们将限制性位点相关DNA测序（RADseq）与该物种原生和引入范围内的全面采样相结合。从198个个体的1365个基因分型SNP位点中，我们确定在其原生范围内， 由一个包括中国大陆、泰国和台湾的东南亚种群以及日本的第二个岛屿种群组成。北美和中美洲是从岛屿种群定殖而来 的，而非洲和大洋洲是从亚洲大陆定殖而来的，夏威夷则是由这两个种群定殖的。北美 的种群在基因上具有多样性且高度结构化，这表明（1）有大量、反复的引入；（2）引入了大量的奠基种群；或者（3）这两种情况都存在且异交率高于预期。 、其他蛀木昆虫，实际上还有许多其他具有不寻常遗传结构的害虫继续在世界各地传播。我们表明，当代遗传方法为理解和预防未来生物安全威胁的途径提供了一个强大的工具。
