title: Population history of the two carnivorous plants Drosera peltata var. nipponica and Drosera rotundifolia (Droseraceae) in Korea.
abstract: OBJECTIVE
  Drosera peltata var. nipponica, an element of the East Asia warm-temperate vegetation, and D. rotundifolia, a widely distributed boreal species, reach one of their northernmost and southernmost limits, respectively, on the Korean Peninsula. Because the Last Glacial Maximum (LGM)-Holocene dynamics of warm-temperate and boreal paleovegetation differed considerably on the Peninsula, the population history of these two sundews is expected to be different, leaving differential imprints in their genetic structure.
  
  
  METHODS
  We investigated population genetic structure of D. peltata var. nipponica and D. rotundifolia in South Korea (10 populations of each for 20 allozyme loci) to infer their population history in this region. In addition, we compared the genetic variation harbored in the two sundews to those reported for other carnivorous and wetland plants.
  
  
  RESULTS
  Drosera peltata var. nipponica showed no genetic diversity, whereas D. rotundifolia exhibited extremely low within-population variation (He = 0.005) and considerable among-population divergence (FST = 0.817).
  
  
  CONCLUSIONS
  Our results suggest that extant populations of D. peltata var. nipponica likely originated from a single ancestral population from southern Japan or southern China through postglacial dispersal. On the contrary, D. rotundifolia probably survived the LGM in situ, with extant populations derived from either one or several small source populations. We argue that separate conservation strategies should be employed, given that the two taxa have different ecological and demographic traits and harbor different levels of genetic diversity.
authors.affiliation: Department of Biology and Research Institute of Natural Science, Gyeongsang National University, Jinju 660-701, Republic of Korea.
authors.forename: Mi Yoon
authors.initials: MY
authors.lastname: Chung
authors.forename: Jordi
authors.initials: J
authors.lastname: López-Pujol
authors.forename: Myong Gi
authors.initials: MG
authors.lastname: Chung
mesh_terms: D003247:Conservation of Natural Resources; D029787:Drosera / Q000235:genetics*; D014644:Genetic Variation; D007527:Isoenzymes; D056910:Republic of Korea; D013045:Species Specificity
chemical_list: D007527:Isoenzymes
keywords: Drosera; Droseraceae; Last Glacial Maximum; allozymes; conservation; genetic drift; glacial refugia; population history