Douris Vassilis, Cameron Robert A D, Rodakis George C, Lecanidou Rena
Division of Biochemistry and Molecular Biology, Department of Biology, University of Athens, Panepistimiopolis, Athens, 157 01, Greece.
Division of Adult Continuing Education, University of Sheffield, 196-198 West Street, Sheffield, S1-4ET, UK.
Evolution. 1998 Feb;52(1):116-125. doi: 10.1111/j.1558-5646.1998.tb05144.x.
The land snail genus Albinaria exhibits an extreme degree of morphological differentiation in Greece, especially in the island of Crete. Twenty-six representatives of 17 nominal species and a suspected hybrid were examined by sequence analysis of a PCR-amplified mitochondrial DNA fragment of the large rRNA subunit gene. Maximum parsimony and neighbor-joining phylogenetic analyses demonstrate a complex pattern of speciation and differentiation and suggest that Albinaria species from Crete belong to at least three distinct monophyletic groups, which, however, are not monophyletic with reference to the genus as a whole. There is considerable variation of genetic distance within and among "species" and groups. The revealed phylogenetic relations do not correlate well with current taxonomy, but exhibit biogeographical coherence. Certain small- and large-scale vicariance events can be traced, although dispersal and parapatric speciation may also be present. Our analysis suggests that there was an early and rapid differentiation of Albinaria groups across the whole of the range followed by local speciation events within confined geographical areas.
在希腊，尤其是在克里特岛，陆地蜗牛属阿尔比纳里亚（Albinaria）呈现出极高程度的形态分化。通过对大核糖体RNA亚基基因的PCR扩增线粒体DNA片段进行序列分析，研究了17个命名物种的26个代表以及一个疑似杂交种。最大简约法和邻接法系统发育分析显示出物种形成和分化的复杂模式，并表明来自克里特岛的阿尔比纳里亚物种至少属于三个不同的单系类群，然而，就整个属而言，它们并非单系的。“物种”和类群内部以及之间的遗传距离存在相当大的差异。所揭示的系统发育关系与当前的分类学并不完全相关，但呈现出生物地理学上的一致性。尽管也可能存在扩散和邻域物种形成，但可以追溯到某些小尺度和大尺度的隔离事件。我们的分析表明，阿尔比纳里亚类群在整个分布范围内早期就迅速分化，随后在有限的地理区域内发生了局部物种形成事件。
