文献类型： 外文期刊

作者： Havill, Nathan P. ¹ ; Shiyake, Shigehiko ² ; Galloway, Ashley Lamb ³ ; Foottit, Robert G. ⁴ ; Yu, Guoyue ⁵ ; Paradi ¹ ;

作者机构： 1.US Forest Serv, No Res Stn, USDA, Hamden, CT 06514 USA

2.Osaka Museum Nat Hist, Osaka 5460034, Japan

3.Virginia Polytech Inst & State Univ, Dept Entomol, Blacksburg, VA 24061 USA

4.Agr & Agri Food Canada, Canadian Natl Collect Insects, Ottawa, ON K1A 0C6, Canada

5.Beijing Acad Agr & Forestry Sci, Inst Plant & Environm Protect, Beijing 100097, Peoples R China

6.Univ Massachusetts, Dept Environm Conservat, Amherst, MA 01003 USA

7.Hokkaido Univ, Grad Sch Agr, Systemat Entomol, Sapporo, Hokkaido 0608589, Japan

8.Yale Univ, Dept Ecol & Evolutionary Biol, New Haven, CT 06520 USA

9.Roane State Community Coll, Dept Biol, Oak Ridge, TN 37830 USA

关键词： complex life cycle;cyclical parthenogenesis;host range;invasive species

期刊名称：MOLECULAR ECOLOGY （ 影响因子：6.185； 五年影响因子：6.801 ）

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收录情况： SCI

摘要： Hemlock woolly adelgid, Adelges tsugae, is an invasive pest of hemlock trees (Tsuga) in eastern North America. We used 14 microsatellites and mitochondrial COI sequences to assess its worldwide genetic structure and reconstruct its colonization history. The resulting information about its life cycle, biogeography and host specialization could help predict invasion by insect herbivores. We identified eight endemic lineages of hemlock adelgids in central China, western China, Ulleung Island (South Korea), western North America, and two each in Taiwan and Japan, with the Japanese lineages specializing on different Tsuga species. Adelgid life cycles varied at local and continental scales with different sexual, obligately asexual and facultatively asexual lineages. Adelgids in western North America exhibited very high microsatellite heterozygosity, which suggests ancient asexuality. The earliest lineages diverged in Asia during Pleistocene glacial periods, as estimated using approximate Bayesian computation. Colonization of western North America was estimated to have occurred prior to the last glacial period by adelgids directly ancestral to those in southern Japan, perhaps carried by birds. The modern invasion from southern Japan to eastern North America caused an extreme genetic bottleneck with just two closely related clones detected throughout the introduced range. Both colonization events to North America involved host shifts to unrelated hemlock species. These results suggest that genetic diversity, host specialization and host phylogeny are not predictive of adelgid invasion. Monitoring non-native sentinel host trees and focusing on invasion pathways might be more effective methods of preventing invasion than making predictions using species traits or evolutionary history.