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智科眼: 双语看懂新科研
首页 中国TOP论文 Nature Science JACS AngewChem PRL AdvMater Lancet Cell EnglMed JAMA
Rapid experimental evolution of reproductive isolation from a single natural population
快速实验进化 of 生殖隔离 from 单一自然种群
Scott M. Villa; Juan C. Altuna; James S. Ruff; Andrew B. Beach; Lane I. Mulvey; Erik J. Poole; Heidi E. Campbell; Kevin P. Johnson; Michael D. Shapiro; Sarah E. Bush; Dale H. Clayton
  • Proc Natl Acad Sci U S A vol: issue: (2019) [全文下载] 扫码分享
  • 影响因子: 9.5 点击(100) 收藏(0) 评分(0)
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  • 综合科学
  • 当地适应产生生殖隔离作为自然选择的副产品时,就会发生生态形态。尽管生态物种形成是多样化的基本来源,但自然选择与生殖隔离之间的机制联系仍然知之甚少,特别是在自然种群中。在这里,我们表明寄生虫体大小超过4年(大约60代)的实验演变导致鸟类羽毛虱的自然种群的生殖隔离。当虱子转移到不同大小的鸽子时,它们会迅速演变出与宿主体型相关的体型差异。这些尺寸差异触发了局部适应不同大小的宿主的虱子之间的机械交配隔离。虱子之间的大小差异也会影响男性与女性接触的竞争结果。因此,身体大小通过其对两性兼容和内部竞争的影响直接介导生殖隔离。我们的研究结果证实,作用于单一表型性状的不同自然选择可以导致实时从单个自然群体中出现生殖隔离。
  • Ecological speciation occurs when local adaptation generates reproductive isolation as a by-product of natural selection. Although ecological speciation is a fundamental source of diversification, the mechanistic link between natural selection and reproductive isolation remains poorly understood, especially in natural populations. Here, we show that experimental evolution of parasite body size over 4 y (approximately 60 generations) leads to reproductive isolation in natural populations of feather lice on birds. When lice are transferred to pigeons of different sizes, they rapidly evolve differences in body size that are correlated with host size. These differences in size trigger mechanical mating isolation between lice that are locally adapted to the different sized hosts. Size differences among lice also influence the outcome of competition between males for access to females. Thus, body size directly mediates reproductive isolation through its influence on both intersexual compatibility and intrasexual competition. Our results confirm that divergent natural selection acting on a single phenotypic trait can cause reproductive isolation to emerge from a single natural population in real time.
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