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Kartavtsev, Yuri Ph.,Svinyna, Olga V. 한국유전학회 2003 Genes & Genomics Vol.25 No.4
Six polymorphic allozyme loci and six morphometric shell characters were analyzed in a collection of 1040 individuals of the predatory gastropod mollusk Nucella heyseana from five principal samples in Vostok Bay and Vrangel Bay of Nakhodka Gulf, both in Peter the Great Bay (East Sea). Allele frequency variability leaves no doubt that each of the two bays inhabited by genetically different populations and that each also comprises heterogeneous and/or subdivided populations. Canonical, discriminant, factor and variance analyses allow connections to be drawn between individual heterozygosity and morphological variability that are dependent on habitat conditions in Vrangel Bay and to less extent in Vostok Bay, which may be regarded as environmentally sub-optimum and optimum respectively. These results support the idea that allozyme phenotypes under some conditions may be selected either per se or as markers of other genes.
Yuri Ph. Kartavtsev,Naoto Hanzawa 한국유전학회 2007 Genes & Genomics Vol.29 No.4
Sequence divergence at cytochrome b mitochondrial gene (Cyt-b) and genetic distances at 30 protein loci were analyzed among Leuciscinae subfamily of cyprinid fishes. Four major conclusions were made: 1. There are four species of the genus Tribolodon that are well enough distinguished genetically both at sequence and allozyme data. All four species have DNA barcode tags (unambiguous per individual clustering at Cyt-b gene sequence) and diagnostic enzyme loci. 2. Nomination of a recently described dace species, Tribolodon nakamurai as the fourth separate species of the genus has fine support from both mtDNA gene sequences and nuclear protein loci. 3. Taxonomically the genus Tribolodon as well as Pseudaspius leptocephalus enter the tribe Pseudaspinini as defined by conventional approach; this status is well supported by genetic data from both mitochondrial and nuclear genome. Still the true phylogeny of the tribe Pseudaspinini requires further examination, including representatives of genera Phoxinus and Oreoleuciscus. 4. The origination and divergence of the species in Pseudaspinini are relatively recent historical events: 1-3 MYR.
Yuri Ph. Kartavtsev,Svetlana N. Sharina,Tadasuke Goto,Andrey A. Balanov,Naoto Hanzawa 한국유전학회 2009 Genes & Genomics Vol.31 No.2
Mitochondrial DNA (mtDNA) at Co-1 gene region was sequenced for 7 scorpion fish species (in total, 16 sequences of at least 552 bp) from the Far East of Russia and compared with 15 other sequences of Scorpaeniformes comprising altogether 29 scorpion-like fish sequences and two outgroup sequences (Cypriniformes). The analysis of the protein-coding Co-1 gene revealed statistically substantiated bias in the (T+C): (A+G) content, proving basic findings. The average scores of p-distances for different scales of the evolutionary history at Co-1 gene revealed a clear pattern of increased nucleotide diversity at four different levels: (1) intraspecies, (2) intragenus, (3) intrafamily, and (4) intraorder. The scores of average p-distances for the compared fish groups were: (1) 1.00±0.20%, (2) 3.80±0.20%, (3) 12.40±1.20%, and (4) 18.00±0.38%, respectively (mean±SE). These data support the concept that speciation in the order Scorpaeniformes, in most cases, follows a geographic mode through accumulation of numerous small genetic changes over a long period of time. However, intraspecies diversity was surprisingly high among scorpionfish. Phylogenetic trees for 29 sequences of scorpionfish and 2 other fishes belonging to ray-finned fishes (Actinopterigii) were developed using Co-1 gene and four different analytical approaches: Bayesian (BA), maximum likelihood (ML), neighbour-joining (NJ), and maximum parsimony (MP). The analysis revealed a monophyletic origin for the representatives of Cottidae, which is the principal scorpionfish family investigated (100, 96, 98% support level in our BA, MP, and NJ analyses). Similarly, the monophyletic origin of up to the three compared scorpion-like fish genera was supported by molecular phylogenetic data. Species identification on individual basis (barcoding tagging) was high. A few taxonomic complications arose during the analysis and they are discussed here in.