Abbott Cathryn L, Double Michael C
School of Botany and Zoology, The Australian National University, Canberra ACT 0200, Australia.
Mol Ecol. 2003 Oct;12(10):2747-58. doi: 10.1046/j.1365-294x.2003.01944.x.
The evolutionary relationship between shy (Thalassarche cauta) and white-capped (T. steadi) albatrosses was examined using mitochondrial control region sequences. Results were interpreted in the context of a recent and contentious taxonomic revision that recommended full species status for shy and white-capped albatrosses. Low sequence divergence between shy and white-capped albatrosses (1.8%) and between their close relatives, Salvin's and Chatham albatrosses (2.9%), was observed. Much higher sequence divergence was found between the shy/white-capped pair and the Salvin's/Chatham pair (7.0%). Phylogenetic analyses confirmed the separation of the shy/white-capped pair from the Salvin's/Chatham pair but did not provide species-level resolution. Phylogeographic analyses, including a nested clade analysis, FST estimates and an analysis of molecular variance, indicated unambiguous genetic structuring between shy and white-capped albatrosses, thus confirming the demographic isolation of the species, but showed little to no structuring within each species. The geographical distribution of mtDNA haplotypes and other evidence suggest that shy albatrosses arose through range expansion by white-capped albatrosses.
利用线粒体控制区序列研究了羞怯信天翁（Thalassarche cauta）和白顶信天翁（T. steadi）之间的进化关系。研究结果是在最近一项有争议的分类学修订背景下进行解读的，该修订建议将羞怯信天翁和白顶信天翁认定为独立物种。研究发现，羞怯信天翁和白顶信天翁之间的序列差异较低（1.8%），它们的近亲萨氏信天翁和查塔姆信天翁之间的序列差异也较低（2.9%）。而羞怯/白顶信天翁组合与萨氏/查塔姆信天翁组合之间的序列差异则高得多（7.0%）。系统发育分析证实了羞怯/白顶信天翁组合与萨氏/查塔姆信天翁组合的分离，但未提供物种水平的分辨率。谱系地理学分析，包括嵌套分支分析、FST估计和分子方差分析，表明羞怯信天翁和白顶信天翁之间存在明确的遗传结构，从而证实了这两个物种在种群统计学上的隔离，但每个物种内部几乎没有结构差异。线粒体DNA单倍型的地理分布及其他证据表明，羞怯信天翁是由白顶信天翁的分布范围扩张形成的。
