Bulletin of Entomological Research

Research Paper

Genetic structure of Lycorma delicatula (Hemiptera: Fulgoridae) populations in Korea: implication for invasion processes in heterogeneous landscapes

Marana Parka1, Kyung-Seok Kima2 and Joon-Ho Leea1a3 c1

a1 Entomology Program, Department of Agricultural Biotechnology, Seoul National University, Seoul, 151-921, Republic of Korea

a2 College of Veterinary Medicine, Seoul National University, Seoul, Republic of Korea

a3 Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul, 151-921, Republic of Korea

Abstract

Lycorma delicatula (White) was identified in 2004 as an invasive pest in South Korea, where it causes serious damage to vineyard crops. To investigate the population structure and dispersal pattern of L. delicatula in South Korea, we estimated the population genetic structure and gene flow among nine locations across the country using seven microsatellite markers. Although L. delicatula spread throughout most of its geographical range in South Korea within 5–7 years following invasion, its populations show evidence of genetic structuring across the range with a low but significant global F ST (genetic differentiation across all populations) of 0.0474. Bayesian-based clustering analysis indicates the presence of at least three genetically unique populations in South Korea, including populations in northeastern South Korea, which show a distinct genetic background. However, isolation by distance suggests that populations in South Korea have not yet reached genetic equilibrium. Estimates of the historical rate of gene flow (N e m) indicate that relatively high rates of flow have been maintained among populations within the western region, which may indicate recent range expansion. A population assignment test using the first-generation migrant detection method suggested that long-distance dispersal of L. delicatula may have occurred over large areas of South Korea. More complex dispersal patterns may have occurred during L. delicatula invasion of heterogeneous landscapes in South Korea.

(Accepted December 06 2012)

(Online publication March 08 2013)

Keywords

  • Lycorma delicatula ;
  • invasive pest;
  • microsatellite;
  • genetic structure