AI Article Synopsis
- The hillstream catfish, Glyptothorax laosensis, is native to the Lancang River basin, which is part of the Mekong River.
- Genetic analysis of eight G. laosensis populations revealed low genetic variation, with only 15 distinct haplotypes identified from 129 sequences and some populations showing no variation at all.
- Despite the low variation, evidence from tests indicated a recent population expansion, as shown by the unimodal mismatch distribution and the significant negative results from selective neutrality tests.
Article Abstract
The hillstream catfish, Glyptothorax laosensis, is endemic to basin of Lancang River (also known as Mekong River). Genetic variation was detected within and among 8 populations of G. laosensis in Lancang River based on mitochondrial cytochrome b sequences. A total 16 nucleotides sites were detected in 1 138 bp fragment, which defined 15 haplotypes from 129 sequences. The variation level was very low, with mean h=0.299 and π=0.00032, respectively, and no variation was detected in some populations. Hierarchical analysis of molecular variance (AMOVA) showed no significant genetic structuring among populations. The unimodel mismatch distribution of pairwise haplotype difference and the negatively selective neutrality test (Tajima's D=2.3696, P<0.02; Fu's Fs=20.975, P<0.05) suggested that a recent population expansion had occurred.
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| http://dx.doi.org/10.3724/sp.j.1005.2011.00255 | DOI Listing |
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