Ramon Marina L, Lobel Phillip S, Sorenson Michael D
Boston University Marine Program, Marine Biological Laboratory, 7 MBL Street, Woods Hole, MA 02543, USA.
Mol Ecol. 2003 Nov;12(11):2975-80. doi: 10.1046/j.1365-294x.2003.01966.x.
Species in the genus Hypoplectrus (hamlet fish) have been recognized primarily on the basis of colour morphology, which varies substantially. Limited differentiation in other morphological characters, however, has led to ongoing debate about their taxonomy. Our analysis of mtDNA sequences demonstrates neither reciprocal monophyly nor significant genetic differentiation among hamlet colour morphs. These data are potentially consistent with a model of recent speciation due to sexual selection on colour morphology. The presence within hamlets of two divergent mtDNA clades, however, suggests a longer history during which hybridization and gene flow have prevented the differentiation of hamlet colour morphs, at least in neutral genetic markers.
低纹鮨属（哈姆雷特鱼）的物种主要是根据颜色形态来识别的，而颜色形态差异很大。然而，其他形态特征的分化有限，这导致了关于它们分类学的持续争论。我们对线粒体DNA序列的分析表明，哈姆雷特鱼的颜色形态之间既不存在相互单系性，也没有显著的遗传分化。这些数据可能与近期由于对颜色形态的性选择而形成物种的模型一致。然而，哈姆雷特鱼中存在两个不同的线粒体DNA分支，这表明在更长的历史时期内，杂交和基因流动阻止了哈姆雷特鱼颜色形态的分化，至少在中性遗传标记方面是这样。
