GENETIC-DIVERGENCE AND GEOGRAPHIC DIVERSIFICATION IN NAUTILUS
GENETIC-DIVERGENCE AND GEOGRAPHIC DIVERSIFICATION IN NAUTILUS
复制标题
DOI：
10.1017/s009483730001321x
复制
发表时间：
1995-03-01
期刊：
影响因子：
2.7
通讯作者：
BONACUM, J
中科院分区：
文献类型：
--
作者：
WRAY, CG;LANDMAN, NH;BONACUM, J
尽管对现今的鹦鹉螺进行了详尽的调查，但Eve或该属内六个公认物种的系统发育关系仍然不清楚。线粒体和核DNA序列数据加上一套形态特征被用来研究系统发育关系。形态变异的系统分析未能将所描述的种描述为独立的谱系。然而，DNA序列分析表明，有三个地理上不同的分支，包括西太平洋，东澳大利亚/巴布亚新几内亚，和西澳大利亚/印度尼西亚的形式。在形态和遗传上不同的物种Scrobiculatus福尔斯落在三个地理上公认的组合之外。鹦鹉螺属的成员也表现出低水平的序列分歧。所有这些数据都表明，鹦鹉螺目前正在经历多样化，这可能只是在几百万年前才开始的。这些数据还表明，用于界定鹦鹉螺物种的一些形态特征可能只是代表同一物种内孤立种群的固定变异。
Despite exhaustive investigation of present-day Nautilus, the phylogenetic relationships of the Eve or six recognized species within this genus remain unclear. Mitochondrial and nuclear DNA sequence data plus a suite of morphological characters are used to investigate phylogenetic relationships. Systematic analysis of the morphological variation fails to characterize described species as independent lineages. However, DNA sequence analysis indicates that there are three geographically distinct clades consisting of western Pacific, eastern Australian/Papua-New Guinean, and western Australian/Indonesian forms. The morphologically and genetically distinct species Nautilus scrobiculatus falls outside the three geographically recognized assemblages. Members of the genus Nautilus also exhibit low levels of sequence divergence. All these data suggest that Nautilus is currently undergoing diversification, which may have begun only several million years ago. These data also suggest that some of the morphological features used to define Nautilus species may simply represent fixed variations in isolated populations within the same species.