1. Genetic differentiation of Macrognathus siamensis within the Mekong River between Laos and Cambodia.
- Author
-
Takagi, A. P., Ishikawa, S., Nao, T., Song, S. L., Hort, S., Thammavong, K., Saphakdy, B., Phomsouvanhm, A., Nishida, M., and Kurokura, H.
- Subjects
MASTACEMBELIDAE ,NUCLEOTIDE sequence ,FISH genetics ,BAYESIAN analysis - Abstract
Summary This study investigated the genetic variation in the Mastacembelidae fish Macrognathus siamensis by sequencing 1047 bp of the mitochondrial ND2 gene of 48 fish samples collected in the Mekong River. They were divided into 15 mtDNA haplotypes. The haplotype network and Bayesian tree revealed striking genetic differences between the Laos and Cambodian samples. The high pairwise F statistic values (0.93-0.97) also confirmed this genetic differentiation. Analysis of the molecular clock indicated that these two samples separated approximately four million years ago. Most likely, the genetic variation was influenced by immigration and isolation events as well as by environmental factors. Furthermore, the present study results could be valuable in identifying the conservation and resource management units of this species. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF