基于线粒体细胞色素b基因序列的虹雉属鸟类的系统发育关系

通过雉科虹雉属(Lophophorus)、角雉属(Tragopan)、勺鸡属(Pucrasia)和血雉属(Ithaginis)7种鸟类的细胞色素b(cyt b)基因序列比较，构建的虹雉属及其近缘属的分子系统树表明：①3种虹雉构成一个单系群(monophyletic group)，虹雉属与角雉属、勺鸡属构成一个单系群；②虹雉属内分为白尾梢虹雉，以及棕尾虹雉和绿尾虹雉两个演化枝。综合分子系统学、地理分布格局和形态学的证据，推测虹雉属鸟类起源于中国的横断山脉，其中繁衍生活在原地的一枝演化为白尾梢虹雉；另一枝则分别进入喜马拉雅山区(西)和中国西南部(东)，向西的演化为棕尾虹雉，向东的则为绿尾虹雉。

Phylogenetic Relationships of Monal Pheasants Lophophorus Inferred from Sequences of Mitochondrial Cytochrome b Gene

The phylogeny of the monal pheasants (Lophophorus) and their relationships to some species of the genera Tragopan,Pucrasia and Ithaginis were studied by comparing mitochondrial cytochrome b (cyt b) nucleotide sequences.The molecular phylogenetic trees show that:①the genus Tragopan and the genus Pucrasia share a common ancestor which is the sister taxon of the ancestor of the genus Lophophorus;②the genus Lophophorus had evolved into two branches:One was the Sclaters Monal;the other included the Chinese Monal and the Himalayan Monal.Considering its molecular phylogeny,distribution patterns and morphological evidences,the genus Lophophorus might originate in the Hengduan mountains region of southwestern China.