Divergent host plant specialization as the critical driving force in speciation between populations of a phytophagous ladybird beetle
Divergent host plant specialization as the critical driving force in speciation between populations of a phytophagous ladybird beetle
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DOI：
10.1111/j.1420-9101.2011.02274.x
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发表时间：
2011-07
影响因子：
2.1
通讯作者：
K. Matsubayashi;S. Kahono;H. Katakura
中科院分区：
文献类型：
--
作者：
K. Matsubayashi;S. Kahono;H. Katakura
发现物种形成过程中最早出现的隔离屏障对于理解物种形成的机制至关重要。我们测试了隔离障碍的寄主种族之间的植食性瓢虫，Henosepilachna diekei（鞘翅目：瓢虫科：瓢虫），共域发生在不同的寄主植物。我们进行了实地调查的甲虫和寄主植物的分布，饲养实验，以衡量六个潜在的隔离因素（成人主机的喜好，成人和幼虫主机的性能，性隔离，卵孵化率，F1杂种活力，对F1杂种的性选择），和线粒体ND2和核ITS2序列的分子分析。我们发现，显着的遗传差异之间的主机种族，和极端分歧的主机偏好（即栖息地隔离）和主机性能（即移民不活力），但没有其他隔离障碍。对特定宿主植物的忠诚首先出现，并且单独地可以防止植食性专家的分化群体之间的基因流动。
Detecting the isolating barrier that arises earliest in speciation is critically important to understanding the mechanism of species formation. We tested isolating barriers between host races of a phytophagous ladybird beetle, Henosepilachna diekei (Coleoptera: Coccinellidae: Epilachnine), that occur sympatrically on distinct host plants. We conducted field surveys for the distribution of the beetles and host plants, rearing experiments to measure six potential isolating factors (adult host preference, adult and larval host performance, sexual isolation, egg hatchability, F1 hybrid inviability, and sexual selection against F1 hybrids), and molecular analyses of mitochondrial ND2 and the nuclear ITS2 sequences. We found significant genetic divergence between the host races, and extremely divergent host preference (i.e. habitat isolation) and host performance (i.e. immigrant inviability), but no other isolating barriers. The fidelity to particular host plants arises first and alone can prevent gene flow between differentiating populations of phytophagous specialists.