Molecular phylogeny and evolution of the deep-sea fish genus Sternoptyx.
Molecular phylogeny and evolution of the deep-sea fish genus Sternoptyx.
复制标题
深海鱼属Sternoptyx 的分子系统发育和进化。
DOI：
--
复制
发表时间：
1998
影响因子：
4.1
通讯作者：
M. Nishida
中科院分区：
文献类型：
--
作者：
M. Miya;M. Nishida
一部分的12 S和16 S核糖体RNA基因的编码序列从所有四个有效的物种的中层水深海鱼类属Sternoptyx（真骨亚纲：Sternoptychidae）和四个sternoptychid外类群。基于二级结构的比对产生了由865个碱基对的两个基因的明确比对、组合序列组成的特征矩阵，使用最大简约法和最大似然法对这些序列进行了系统发育分析。从两种方法得到的树拓扑结构是一致的，并支持各种树统计。虽然单一的最吝啬的树是没有统计学差异的两个第二吝啬的树，独立的形态学证据，从臀鳍psychophore配置和相关的结构强烈支持前者作为首选的假设。映射到树上的四个物种的当代地理分布模式表明，有一个共同的祖先Sternoptyx与环球分布，这已被细分为南部和北方祖先人口沿着30度S，可能通过一些大规模的海洋事件。南方种群中没有明显的物种形成事件，但北方种群随后形成了三个当代物种，主要是异域/微异域分布。
A portion of mitochondrially encoded 12S and 16S ribosomal RNA genes were sequenced from all four valid species of the midwater deep-sea fish genus Sternoptyx (Teleostei: Sternoptychidae) and four sternoptychid outgroup taxa. Secondary structure-based alignment resulted in a character matrix consisting of 865 bp of unambiguously aligned, combined sequences of the two genes, which were subjected to phylogenetic analyses using the maximum parsimony and maximum likelihood methods. The resultant tree topologies from the two methods were congruent and supported by various tree statistics. Although the single most parsimonious tree was not statistically different from the two second parsimonious trees, independent morphological evidence from the anal fin pterygiophore configuration and associated structures strongly supported the former as the preferred hypothesis. Mapping of the contemporary geographic distribution patterns of the four species onto the tree suggested that there was a common ancestor of Sternoptyx with a circumglobal distribution, which had been subdivided into southern and northern ancestral populations along 30 degrees S, possibly through some large-scale oceanographic event. There has been no discernible speciation event in the southern population, though the northern population has subsequently speciated into three contemporary species with largely allopatric/microallopatric distributions.