Department of Biology, Center for Macroecology, Evolution and Climate, University of Copenhagen, Copenhagen, Denmark.
PLoS One. 2011;6(6):e20394. doi: 10.1371/journal.pone.0020394. Epub 2011 Jun 8.
Closely related species that show clear phenotypic divergence, but without obvious geographic barriers, can provide opportunities to study how diversification can occur when opportunities for allopatric speciation are limited. We examined genetic divergence in the coral reef fish genus Hypoplectrus (family: Serranidae), which comprises of 10-14 morphotypes that are distinguished solely by their distinct colour patterns, but which show little genetic differentiation. Our goal was to detect loci that show clear disequilibrium between morphotypes and across geographical locations. We conducted Amplified Fragment Length Polymorphism molecular analysis to quantify genetic differentiation among, and selection between, morphotypes. Three loci were consistently divergent beyond neutral expectations in repeated pair-wise morphotype comparisons using two different methods. These loci provide the first evidence for genes that may be associated with colour morphotype in the genus Hypoplectrus.
密切相关的物种表现出明显的表型分化，但没有明显的地理障碍，这为研究当形成异域物种的机会受到限制时，多样化是如何发生的提供了机会。我们研究了珊瑚礁鱼类 Hypoplectrus 属（Serranidae 科）的遗传分化，该属包括 10-14 种形态类型，仅通过其独特的颜色图案来区分，但遗传分化很小。我们的目标是检测那些在形态类型和地理区域之间表现出明显不平衡的基因座。我们进行了扩增片段长度多态性分子分析，以量化形态类型之间和形态类型之间的遗传分化。使用两种不同的方法，在重复的两两形态类型比较中，有三个基因座始终超出中性预期的分歧。这些基因座为与 Hypoplectrus 属中颜色形态类型相关的基因提供了第一个证据。
