Sequential loss of genetic variation in flea beetle Agasicles hygrophila (Coleoptera: Chrysomelidae) following introduction into China

作者

Ma, Rui-Yan; Jia, Xiao-Yun; Liu, Wen-Zhong; 更多内容

期刊:INSECT SCIENCE ISSN:1672-9609 , 年:2013 . 卷:20 . 期:5 页码:655-661

语种: English

原文链接:http://dx.doi.org/10.1111/1744-7917.12025

摘要

The flea beetle (Agasicles hygrophila) was imported to Florida, USA and then introduced from Florida into China in 1987 as a biological control agent for the invasive plant alligator weed (Alternanthera philoxeroides). The initial beetle population was subsequently used for sequential introductions in other areas of China, but little is known about the genetic consequences of the introductions. In this study, the genetic diversity and population structure of five beetle populations, the source Florida population, three intentionally introduced China populations and one accidentally dispersed China population, were examined using amplified fragment length polymorphisms. The results showed a clear pattern of decreasing genetic diversity with the sequential introductions. The diversity was highest in the Florida population followed by the first introduction to Chongqing and then in Kunming and Fuzhou. The lowest diversity was found in the accidentally dispersed Guangzhou population that was first recorded in 1996. Both loci parameters and Nei's genetic diversity showed a high variation among these populations. Genetic differentiation among populations was further verified by the G(ST) statistic (0.136-0.432). Beetles in Kunming had the highest gene flow with those in Guangzhou, and therefore lowest differentiation and closest genetic distance. These data show that sequential introduction influenced the genetic diversity of populations in China. Genetic diversity should be considered in planning introduction and long-term maintenance of populations.

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关键词
AFLP; Agasicles hygrophila; biological control; genetic diversity; introduction

附加关键词:
BIOLOGICAL-CONTROL; POPULATION-STRUCTURE; DIVERSITY; DISTANCE; INDIVIDUALS; EVOLUTION; MARKERS; NUMBER; AFLP; DNA

作者信息

通讯作者:
     Ma, RY , Shanxi Agr Univ, Dept Biosafety, Taigu 030801, Shanxi, Peoples R China.
作者机构:
     [1] [ Ma, Rui-Yan; Jia, Xiao-Yun; Zhao, Long-Long; Jia, Dong ] Shanxi Agr Univ, Dept Biosafety, Taigu 030801, Shanxi, Peoples R China.
     [2] [ Liu, Wen-Zhong ] Shanxi Agr Univ, Coll Anim Sci & Technol, Taigu 030801, Shanxi, Peoples R China.
     [3] [ Laushman, Roger H. ] Oberlin Coll, Dept Biol, Oberlin, OH 44074 USA.
     [4] [ Wang, Ren ] Chinese Acad Agr Sci, Beijing 100193, Peoples R China.
作者邮箱:
     maruiyan2004@163.com