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首页> 外文期刊>Zoologica Scripta: An International Journal of Evolutionary Zoology >Multiple reversals of chirality in the land snail genus Albinaria (Gastropoda, Clausiliidae)
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Multiple reversals of chirality in the land snail genus Albinaria (Gastropoda, Clausiliidae)

机译：田螺属白化病（Gastropoda，Clausiliidae）的手性的多重逆转

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摘要

Reversed chirality has frequently evolved in snails, although the vast majority coils dextrally. However, there are often sinistral species within a dextral genus or almost exclusively sinistral families, such as the Clausiliidae. Some populations of the predominantly sinistral clausiliid genus Albinaria, in the southern Greek mainland, coil dextrally. The origin, evolution and distribution of the dextral Albinaria are puzzling, and as there is no reliable phylogenetic reconstruction for this speciose genus, it remains unclear how many times a shift in chirality has really occurred. In this study, our aim was to elucidate the evolutionary pathways of dextrality in Albinaria. We undertook a molecular phylogenetic analysis of two mtDNA (16S and COI) and one nDNA marker (ITS1) and included dextral and sinistral representatives found in syntopy or not. Both mtDNA and nDNA tree topologies imply that dextrals did not evolve as a monophyletic lineage. Instead, dextral lineages have evolved from sinistral ancestors multiple times independently. The fragmented population structure in Albinaria facilitates genetic drift and contributes to fixation of the opposite chirality and overcoming of the mating disadvantage of left-right reversal. Stochastic phenomena and biogeographical barriers have trapped those reversals in a limited geographical area.
机译：反向手性在蜗牛中经常发生，尽管绝大多数是螺旋状的。但是，右旋属中通常有一些鼻窦科，或几乎全部是鼻窦科，例如克劳斯龙科。在希腊南部大陆，一些主要为鼻窦类clausiliid属Albinaria的种群右旋。右旋白化病的起源，进化和分布令人困惑，并且由于没有针对该特定属的可靠的系统发育重建，目前尚不清楚手性发生了多少次转变。在这项研究中，我们的目的是阐明白化病中灵巧性的进化途径。我们对两个mtDNA（16S和COI）和一个nDNA标记（ITS1）进行了分子系统发育分析，包括是否存在同义的右旋和鼻窦代表。 mtDNA和nDNA树形拓扑均暗示右旋糖类不会进化为单系谱系。取而代之的是，右旋宗族已经从鼻祖先独立地进化了多次。 Albinaria中零散的种群结构促进了遗传漂移，并有助于固定相反的手性，并克服了左右反转的交配劣势。随机现象和生物地理障碍已将这些逆转困在有限的地理区域内。

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