title: Population genetic structure and its implication in the conservation of Schizopygopsis pylzovi in Yellow River as inferred from mitochondrial DNA sequence analysis.
abstract: To assess the genetic diversity, structure, and population dynamics of Schizopygopsis pylzovi, we examined the changes in mitochondrial DNA sequences (the mtDNA control region and the Cyt b gene; 1835 bp) in 304 individuals from nine populations. The samples were segregated into 112 haplotypes, with high haplotype diversity and low nucleotide diversity. The haplotype diversity was highest in the Minhe (HS) range of Huangshui River and lowest in the Weiyuan (WY) range of Weihe River. Analysis of molecular variance showed that 69.64% of the total genetic variance was contributed by within-the-group variation and 30.36% was contributed by among-the-group variation. Pairwise FSTrevealed significant divergence between the populations. The FSTbetween the MT and WY was highest, and that between the YZ and YJ was lowest. The neighbor-joining phylogenetic tree demonstrated that all geographic populations were not monophyletic, but overlapped each other, indicating that the duration of geographical isolation was not long enough or the populations had not yet reached significant genetic isolation or differentiation at the monophyletic level. Tajima's D and Fu's Fs were negative and statistically significant, indicating that S. pylzovi had experienced certain population expansion events, which is consistent with the hypothesis that the headwater area of the Yellow River was dramatically affected by the geological and climatic upheaval during the Quaternary ice age. Our analysis indicated that the management units corresponding to the WY population should be managed and conserved first. In situ conservation is first recommended to protect the original habitat from further destruction.
authors.affiliation: Department of Chemistry and Life Sciences, Gansu Normal University for Nationalities, Hezuo, Gansu, China.
authors.forename: Y N
authors.initials: YN
authors.lastname: Ma
authors.affiliation: Gansu Key Laboratory of Cold Water Fishes Germplasm Resources and Genetics Breeding, Gansu Fishery Research Institute, Lanzhou, Gansu, China.
authors.forename: Y Y
authors.initials: YY
authors.lastname: Du
authors.affiliation: Gansu Key Laboratory of Cold Water Fishes Germplasm Resources and Genetics Breeding, Gansu Fishery Research Institute, Lanzhou, Gansu, China.
authors.forename: Y P
authors.initials: YP
authors.lastname: Zhang
authors.affiliation: Department of Chemistry and Life Sciences, Gansu Normal University for Nationalities, Hezuo, Gansu, China aqhongqi@qq.com.|Gansu Key Laboratory of Cold Water Fishes Germplasm Resources and Genetics Breeding, Gansu Fishery Research Institute, Lanzhou, Gansu, China aqhongqi@qq.com.
authors.forename: T
authors.initials: T
authors.lastname: Wang
mesh_terms: D000818:Animals; D002681:China; D003247:Conservation of Natural Resources; D003530:Cyprinidae / Q000145:classification / Q000235:genetics*; D045303:Cytochromes b / Q000235:genetics*; D004272:DNA, Mitochondrial / Q000235:genetics*; D014644:Genetic Variation; D016678:Genome; D006239:Haplotypes; D010802:Phylogeny; D058974:Phylogeography; D011157:Population Dynamics; D045483:Rivers; D017422:Sequence Analysis, DNA
chemical_list: D004272:DNA, Mitochondrial; D045303:Cytochromes b