Volume 90, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Species and subspecies of the species complex are recognized as intermediate hosts of . Of these species and subspecies, is distributed throughout the Philippines. This study used 12S ribosomal RNA sequences to explore the genetic structure of populations in the Philippines. Three subspecies, , , and of this group were also examined. The phylogenetic tree and haplotypes network showed that separated from the subspecies. Ten haplotypes (Oq1–Oq10) clustered in relation to their geographic origin. Genetic differentiation ( ) and estimated gene flow (Nm) among populations showed significant differences, ranging from 0.556–1.000 to 0.00–0.74, respectively. Genetic differences among groups ( = 0.466), populations within a group ( = 0.727), and populations ( = 0.854) were observed. These results indicate that the populations in the Philippines have a substructure associated with their geographic origin.


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  • Received : 14 May 2013
  • Accepted : 12 Jan 2014

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