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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Spontaneous heterosis in larval life-history traits of hemiclonal frog hybrids
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Spontaneous heterosis in larval life-history traits of hemiclonal frog hybrids

机译：半边蛙杂交种幼虫生活史特征的自发杂种优势

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摘要

European water frog hybrids Rana esculenta (Rana ridibunda x Rana lessonae) reproduce hemiclonally, transmitting only their ridibunda genome to gametes. We compared fitness-related larval life-history traits of natural R. esculenta from Poland with those of the two sympatric parental species and of newly generated F'hybrids. Compared with either parental species, Fi hybrid offspring had higher survival, higher early growth rates, a more advanced developmental stage by day 49, and earlier metamorphosis, but similar mass at metamorphosis. R. esculenta from natural lineages had trait values intermediate between those of Fi offspring and of the two parental species. The data support earlier observations on natural R. esculenta that had faster larval growth, earlier metamorphosis, and higher resistance to hypoxic conditions compared with either parental species. Observing larval heterosis in Fi hybrids in survival, growth rate, and time to metamorphosis, however, at an even higher degree than in hybrids from natural lincages, demonstrates that heterosis is spontaneous and results from hybridity per se rather than from subsequent interelonal selection; in natural lineages the effects of hybridity and of clonal history are confounded. This is compelling evidence for spontaneous hetcrosis in hybrid clonals. Results on hemiclonal fish hybrids (Poeciliopsis) showed no spontaneous heterosis; thus, our frog data are not applicable to all hybrid clonals. Our data do Show, however, that hetcrosis is an important potential source for the extensively observed ecological success of hybrid
机译：欧洲水蛙杂种蛙蛙（Rana ridibunda x Rana lessonae）半克隆繁殖，仅将其蛙足纲基因组传递给配子。我们比较了与波兰人天然的R. esculenta的健身相关的幼虫生活史特征，以及两个同父异系的亲本和新生成的F'hybrids的生命史特征。与任一亲本物种相比，Fi杂种后代具有更高的存活率，更高的早期生长速率，到第49天的发育阶段更早，变态更早，但变态时的质量相似。来自自然谱系的埃斯库伦特氏菌的性状值介于Fi后代和两个亲本物种之间。数据支持较早的关于天然R. esculenta的观察，与任何亲本物种相比，其具有更快的幼虫生长，更早的变态和对低氧条件的更高抵抗力。然而，观察Fi杂种的存活，生长速度和变态时间的幼虫杂种优势，其程度甚至比天然l子杂种中的幼虫杂种优势更高，这表明杂种优势是自发的，是杂种本身的结果，而不是随后的内部选择。在自然谱系中，杂交和克隆历史的影响是混乱的。这是杂种克隆自发性坏死的有力证据。半球形鱼杂种的结果（自噬）无自发杂种优势。因此，我们的青蛙数据并不适用于所有杂交克隆。然而，我们的数据确实表明，杂种优势是广泛观察到的杂种生态成功的重要潜在来源

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