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Genetic structure of five Huanghe schizothoracin Schizopygopsis pylzovi populations based on mtDNA control region sequences

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Author(s): QI De-Lin | CHAO Yan | GUO Song-Chang | ZHAO Xin-Quan

Journal: Acta Zoologica Sinica
ISSN 0001-7302

Volume: 54;
Issue: 6;
Start page: 972;
Date: 2008;
Original page

Keywords: Huanghe schizothoracin | Schizopygopsis pylzovi | Mitochondrial control region | Population genetic structure | Population expansion | Qinghai-Tibetan Plateau

ABSTRACT
Huanghe schizothoracin Schizopygopsis pylzovi is a freshwater fish endemic to Qinghai-Tibetan Plateau, which distributes mainly in the Qiadam drainage and the upper reaches of Yellow River in the northern and northeastern Qinghai-Tibetan Plateau. So far little is known about the genetic diversity, radiation and population structure. In the present study, the sequence of mitochondrial control region (821bp) of 99 individuals representing five populations in the distribution regions were sequenced. Within the analyzed 821 bp bases, 77 (9.37%) nucleotides were variable, and a total of 53 haplotypes were identified, in which only one haplotype (DT12) was shared by two populations in the upper reaches of Yellow River. Haplotype diversity (h=0.79±0.06) and nucleotide diversity (π=0.0027±0.0017) of the populations in Qiadam drainage were lower than those of the populations in the upper reaches of Yellow River. The AMOVA analysis indicated that the genetic variation mainly occurred within populations instead of among populations. Although no geographic clustering was observed in the phylogenetic tree, significant population subdivision was supported by both of the pairwise Fst values and average pairwise differences. This result implies that the geographic barriers among the drainages were formed relatively late by the uplift of Qinghai-Tibetan Plateau. The unimodal mismatch distribution of haplotypes, based on the selective neutrality test of Tajima’s D (-1.497, P =0.058) and Fu’s Fs (-24.741, P=0.001), suggest that a recent population expansion of Huanghe schizothoracin has been occurred during the uplift of the Qinghai-Tibetan Plateau [Acta Zoologica Sinica 54(6): 972–980, 2008].
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