Evidence of introgressive hybridization between the morphologically divergent land snails Ainohelix and Ezohelix
Evidence of introgressive hybridization between the morphologically divergent land snails Ainohelix and Ezohelix
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DOI：
10.1111/bij.12466
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发表时间：
2015-05-01
影响因子：
1.9
通讯作者：
Chiba, Satoshi
中科院分区：
文献类型：
--
作者：
Morii, Yuta;Yokoyama, Jun;Chiba, Satoshi
当适应性形态差异比生殖隔离进化得更快时，不同类群之间的杂交可能发生。利用核内转录间隔区和线粒体16 S核糖体DNA对产自日本北海道的两种不同属的陆生蜗牛-艾诺螺（Ainohelix editha）和盖氏艾螺（Ezohelix gainesi）的系统发育关系进行了研究。此外，没有明确的联系之间的贝壳形态（定义分类）和核或线粒体树和生殖系统的形态。这些模式是最有可能解释的历史渐渗A.editha和E. gainesi之间的杂交。由于这两个物种的外壳形态非常不同，即使它们共存，这意味着自然选择能够在基因流面前保持（或重新创造）不同的形态。未来的研究可能能够揭示这些物种之间保持形态差异的基因组区域。(c)2015年，伦敦林奈学会，林奈学会生物学杂志，2015年，115，77-95。
Hybridization between different taxa is likely to take place when adaptive morphological differences evolve more rapidly than reproductive isolation. When studying the phylogenetic relationship between two land snails of different nominal genera, Ainohelix editha and Ezohelix gainesi, from Hokkaido, Japan, using nuclear internal transcribed spacer and mitochondrial 16S ribosomal DNA, we found a marked incongruence in the topology between nuclear and mitochondrial phylogenies. Furthermore, no clear association was found between shell morphology (which defines the taxonomy) and nuclear or mitochondrial trees and morphology of reproductive system. These patterns are most likely explained by historical introgressive hybridization between A.editha and E.gainesi. Because the shell morphologies of the two species are quite distinct, even when they coexist, the implication is that natural selection is able to maintain (or has recreated) distinct morphologies in the face of gene flow. Future studies may be able to reveal the regions of the genome that maintain the morphological differences between these species.(c) 2015 The Linnean Society of London, Biological Journal of the Linnean Society, 2015, 115, 77-95.