IF 3.4 1区 生物学 Q2 EVOLUTIONARY BIOLOGY Evolution Letters Pub Date : 2024-09-26 eCollection Date: 2025-02-01 DOI:10.1093/evlett/qrae050
Diana Tataru, Max De Leon, Spencer Dutton, Fidel Machado Perez, Alexander Rendahl, Kathleen G Ferris
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引用次数: 0

摘要

早期的进化生物学家认为杂交是适应和物种分化的障碍,而最近的研究则证明了杂交在促进进化过程中的重要性。然而,自然选择的空间和时间变化在维持自然发生的杂交区中发挥了什么作用,目前还不为人所知。为了确定两种亲缘关系很近的猴头花(Mimulus guttatus和Mimulus laciniatus)之间的杂交是否具有适应性,我们在天然杂交种和纯种种群之间进行了反复的互交移植。我们在加利福尼亚州内华达山脉的干旱年(2021 年)和极端潮湿年(2023 年)分别种植了亲本基因型和多代实验杂交种。通过精细的环境测量,我们发现杂交区的环境更类似于M. laciniatus的季节性干燥岩石露头栖息地,而不是M. guttatus的潮湿草地。在我们的移植物中,杂交似乎并不是通过杂交区中杂交种相对于亲本物种的持续适应优势来维持的,而是缺乏对杂交种的强烈选择。我们还发现,在两个物种的栖息地中,适应干旱的物种M. laciniatus比M. guttatus具有更高的适应性,而且在我们实验的干旱年份,杂交栖息地中的M.这些发现表明,在这个系统中,杂交可能会将M. laciniatus适应干旱的性状和基因引入M. guttatus,特别是在土壤水分有限的年份。不过,我们也发现,在较湿润的年份,第二代杂交种的基因不相容,这可能会平衡 M. laciniatus 引种的选择性优势。因此,我们发现该系统中的杂交既具有潜在的适应性,又代价高昂,正负选择的相互作用很可能决定了这些含羞草物种之间的基因流动模式。
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Fluctuating selection in a monkeyflower hybrid zone.

While hybridization was viewed as a hindrance to adaptation and speciation by early evolutionary biologists, recent studies have demonstrated the importance of hybridization in facilitating evolutionary processes. However, it is still not well-known what role spatial and temporal variation in natural selection play in the maintenance of naturally occurring hybrid zones. To identify whether hybridization is adaptive between two closely related monkeyflower species, Mimulus guttatus and Mimulus laciniatus, we performed repeated reciprocal transplants between natural hybrid and pure species' populations. We planted parental genotypes along with multiple experimental hybrid generations in a dry (2021) and extremely wet (2023) year in the Sierra Nevada, CA. By taking fine-scale environmental measurements, we found that the environment of the hybrid zone is more similar to M. laciniatus's seasonally dry rocky outcrop habitat than M. guttatus's moist meadows. In our transplants hybridization does not appear to be maintained by a consistent fitness advantage of hybrids over parental species in hybrid zones, but rather a lack of strong selection against hybrids. We also found higher fitness of the drought-adapted species, M. laciniatus, than M. guttatus in both species' habitats, as well as phenotypic selection for M. laciniatus-like traits in the hybrid habitat in the dry year of our experiment. These findings suggest that in this system, hybridization might function to introduce drought-adapted traits and genes from M. laciniatus into M. guttatus, specifically in years with limited soil moisture. However, we also find evidence of genetic incompatibilities in second generation hybrids in the wetter year, which may balance a selective advantage of M. laciniatus introgression. Therefore, we find that hybridization in this system is both potentially adaptive and costly, and that the interaction of positive and negative selection likely determines patterns of gene flow between these Mimulus species.

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来源期刊
Evolution Letters
Evolution Letters EVOLUTIONARY BIOLOGY-
CiteScore
13.00
自引率
2.00%
发文量
35
审稿时长
10 weeks
期刊介绍: Evolution Letters publishes cutting-edge new research in all areas of Evolutionary Biology. Available exclusively online, and entirely open access, Evolution Letters consists of Letters - original pieces of research which form the bulk of papers - and Comments and Opinion - a forum for highlighting timely new research ideas for the evolutionary community.
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