Radiation and reticulation: extensive introgressive hybridization in the carabid beetles Ohomopterus inferred from mitochondrial gene genealogy
Radiation and reticulation: extensive introgressive hybridization in the carabid beetles Ohomopterus inferred from mitochondrial gene genealogy
复制标题
辐射和网状：从线粒体基因谱系推断出步甲甲虫 Ohomopterus 中的广泛渐渗杂交
作者：
T. Sota
摘要在动物谱系的进化过程中，分化种群的次级接触和渐渗杂交的相互作用可能起着重要的作用。 在日本的岛屿，步甲亚属（属）的Ohomopterus表现出显着的分化，在身体大小和生殖器形态。虽然地理分化是明显的，两个或三个物种通常共存于许多地方。他们的生殖隔离依赖于身体大小的差异，配偶识别的化学线索，以及物种特异性的生殖器锁和钥匙系统。然而，这些隔离机制并不总是足够有效地防止种间杂交。一个初步的评估与线粒体基因序列的物种水平的亲缘关系显示，基因谱系是高度不一致的形态学为基础的分类。线粒体和核基因谱系的比较表明，这些是强烈不一致的彼此，而核基因谱系是更符合传统的分类学，表明在物种之间的线粒体渐渗的重复发生。在这里，两个不同的情况下，线粒体基因渗入的Ohomopterus物种之间的详细描述，一个parapatric物种和其他同域物种。首先，研究了岛生步甲和三种近缘步甲的线粒体单倍型和序列。insulicola，其中至少两个与C.自然的岛。在研究的四个物种中，检测到线粒体跨边界区的定向渐渗。第二，在Mt。在本州中部的金刚地区，其中有五个物种，线粒体的渐渗的五个物种中的四个被检测到，尽管显然没有正在进行的自然杂交。这些推断的线粒体渐渗的情况下表明，物种之间的相互作用，通过杂交可能发挥了重要作用，在不同阶段的进化同翅目。
Abstract In the evolutionary process of an animal lineage, interactions in secondary contacts of differentiated populations and introgressive hybridization may play an important role. In the Japanese islands, the carabid subgenus Ohomopterus (genus Carabus) exhibits a marked differentiation in body size and genital morphology. Although geographical differentiation is apparent, two or three species usually coexist at many localities. Their reproductive isolation relies on body size differences, chemical cues for mate recognition, and a species-specific genital lock-and-key system. However, these isolation mechanisms are not always effective enough to prevent interspecific hybridization. An initial assessment of the species-level phylogeny with mitochondrial gene sequences revealed that the gene genealogy is highly inconsistent with the morphology-based taxonomy. A comparison of mitochondrial and nuclear gene genealogies showed that these are strongly incongruent with each other, while the nuclear gene genealogy is more consistent with traditional taxonomy, indicating the repeated occurrence of introgression of mitochondria across species. Here, two different cases of mitochondrial introgression among Ohomopterus species are described in detail, one for parapatric species and the other for sympatric species. First, mitochondrial haplotypes and sequences were studied in Carabus insulicola and three taxa parapatric with C. insulicola, at least two of which hybridize with C. insulicola naturally. Among the four species studied, directional introgressions of mitochondria across boundary zones were detected. Second, in the Mt. Kongo area in central Honshu, which harbors five species, introgression of mitochondria among four out of the five species was detected, despite the apparent absence of on-going natural hybridization. These inferred cases of mitochondrial introgression indicate that species interactions through hybridization could have played an important role at various stages in the evolution of Ohomopterus.
影响因子：
3.3
作者：
Alan R. Templeton;K. Crandall;C. Sing
通讯作者：
Alan R. Templeton;K. Crandall;C. Sing