Reproductive isolation via divergent genital morphology due to cascade reinforcement in <i>Ohomopterus</i> ground beetles
Reproductive isolation via divergent genital morphology due to cascade reinforcement in <i>Ohomopterus</i> ground beetles
复制标题
由于 <i>Ohomopterus</i> 地面甲虫的级联强化，通过不同的生殖器形态进行生殖隔离
DOI：
10.1111/jeb.14116
复制
发表时间：
2022
影响因子：
2.1
通讯作者：
Takami Yasuoki
中科院分区：
文献类型：
--
作者：
Xia Tian;Nishimura Taira;Nagata Nobuaki;Kubota Kohei;Sota Teiji;Takami Yasuoki
早期物种之间的二次接触和对适应不良杂交的选择可以驱动接触种群之间的强化，并导致生殖性状置换（RCD）。一个物种内交配性状的差异可能会在具有位移和非位移性状的种群之间产生下游生殖隔离，称为级联强化假说。我们使用具有生殖器锁和钥匙系统的地面甲虫Carabus maiyasanus的三个异地种群来检验这一假设。该物种在与姐妹物种C接触的种群中显示出雄性和雌性生殖器形态的RCD。岩瓦基亚斯在一个互惠交配实验中，使用三个异地种群的差异，男性和女性的生殖器大小，授精失败增加的差异，生殖器的大小增加。根据生殖隔离指数，授精失败是主要的交配后-合子前隔离障碍，至少在一个种群对中，与其他物种对的总隔离相当。与此相反，只有不完全的交配前隔离的群体。这些结果表明，生殖器形态的RCD驱动初期异域物种形成，支持级联强化假说。这些研究结果提供了深入了解物种形成processes.AbstractWe的种间相互作用和随后的性状多样化的作用调查生殖隔离的异域种群的地面甲虫Carabus maiyasanus，这表明在男性和女性生殖器形态的地理变化，根据生殖特性位移接触的姐妹speciesCarabus iwakianus人口。交配后-受精前的隔离有关精荚形成的成功取决于男性和女性生殖器大小之间的差异，支持级联强化假说。
Secondary contact between incipient species and selection against maladaptive hybridization can drive reinforcement between populations in contact and result in reproductive character displacement (RCD). Resultant divergence in mating traits within a species may generate downstream reproductive isolation between populations with displaced and non‐displaced traits, referred to as the cascade reinforcement hypothesis. We examined this hypothesis using three allopatric populations of the ground beetle Carabus maiyasanus with a genital lock‐and‐key system. This species shows RCD in male and female genital morphologies in populations in contact with the sister species C. iwawakianus. In a reciprocal mating experiment using three allopatric populations with differences in male and female genital sizes, insemination failure increased as the difference in genital size increased. Based on the reproductive isolation index, insemination failure was the major postmating‐prezygotic isolation barrier, at least in one population pair with comparable total isolation to those of other species pairs. By contrast, there was only incomplete premating isolation among populations. These results suggest that RCD in genital morphologies drives incipient allopatric speciation, supporting the cascade reinforcement hypothesis. These findings provide insight into the roles of interspecific interactions and subsequent trait diversification in speciation processes.AbstractWe investigated reproductive isolation between allopatric populations of the ground beetleCarabus maiyasanus, which shows geographical variation in male and female genital morphologies according to reproductive character displacement in populations in contact with the sister speciesCarabus iwawakianus. Postmating‐prezygotic isolation concerning spermatophore formation success depended on difference between male and female genital sizes, supporting the cascade reinforcement hypothesis.