将表型变异与沿物种形成连续体的遗传隔离模式联系起来。

IF 2.8 3区 生物学 Q1 MARINE & FRESHWATER BIOLOGY
Sabrina Heiser, Charles D. Amsler, Andrew J. Shilling, Hazel M. Higginbotham, Margaret O. Amsler, Solenn Stoeckel, James B. McClintock, Bill J. Baker, Stacy A. Krueger-Hadfield
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引用次数: 0

摘要

研究不同分化阶段的分类群,可以揭示导致生殖隔离和最终物种形成的进化力量。促进隔离的力量在空间和时间上是不同的,这使得很难重建导致今天在物种之间观察到的分歧的轨迹。红大藻属Plocamium因其遗传和化学多样性而闻名于世。先前在南极洲对Plocamium属的研究发现,沿着南极半岛西部,有两种单倍型被视为同一物种。利用10个微卫星位点,我们观察到这两个单倍型对应于南极古陆中两个高度分化的共同发生的遗传实体,它们位于彼此靠近的同一地点。生殖结构的形态(通常用于识别Plocamium中隐种的特征)以及繁殖时间在两个遗传实体之间存在显着差异。总的来说,这表明在南极半岛西部存在两个南极普洛卡门物种。我们观察到两种遗传实体的高水平自恋的证据,这可能加剧了它们之间基因流动的缺乏。此外,我们还发现了伴随的化学多样性,这产生了令人信服的证据,证明这些实体中的一个存在早期进化分歧。这种化学多样性对其主要食草动物有生态影响,这暗示了一个假定的分化进化驱动因素。南极Plocamium为研究物种边界形成和维持的生态进化力量提供了一个有希望的模型系统。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Linking phenotypic variation to patterns of genetic isolation along a speciation continuum

Linking phenotypic variation to patterns of genetic isolation along a speciation continuum

Investigating taxa at varying stages of divergence can shed light on the evolutionary forces that lead to reproductive isolation and eventual speciation. The forces promoting isolation vary in space and time, which makes it difficult to reconstruct the trajectory that resulted in the divergence observed among species today. The red macroalgal genus Plocamium is known worldwide for its cryptic genetic and chemical diversity. Previous work on the genus Plocamium in Antarctica observed two haplotypes along the western Antarctic Peninsula that have been treated as the same species. Using 10 microsatellite loci, we observed that these two haplotypes correspond to two highly divergent, co-occurring genetic entities in Antarctic Plocamium, which are located within close vicinity of each other at the same sites. The morphology of the reproductive structures, a feature commonly used to identify cryptic species in Plocamium, as well as the timing of reproduction, differed significantly between the two genetic entities. Altogether, this suggests that two Antarctic Plocamium species exist on the western Antarctic Peninsula. We observed evidence for high levels of selfing in both genetic entities, which likely exacerbated the lack of gene flow between them. In addition, we identified concomitant chemodiversity that generates compelling evidence of early evolutionary divergence within one of these entities. This chemodiversity has ecological consequences for its main grazer, which alludes to one putative evolutionary driver of divergence. Antarctic Plocamium spp. provide a promising model system for investigating the eco-evolutionary forces that initiate and maintain species boundaries.

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来源期刊
Journal of Phycology
Journal of Phycology 生物-海洋与淡水生物学
CiteScore
6.50
自引率
3.40%
发文量
69
审稿时长
2 months
期刊介绍: The Journal of Phycology was founded in 1965 by the Phycological Society of America. All aspects of basic and applied research on algae are included to provide a common medium for the ecologist, physiologist, cell biologist, molecular biologist, morphologist, oceanographer, taxonomist, geneticist, and biochemist. The Journal also welcomes research that emphasizes algal interactions with other organisms and the roles of algae as components of natural ecosystems. All aspects of basic and applied research on algae are included to provide a common medium for the ecologist, physiologist, cell biologist, molecular biologist, morphologist, oceanographer, acquaculturist, systematist, geneticist, and biochemist. The Journal also welcomes research that emphasizes algal interactions with other organisms and the roles of algae as components of natural ecosystems.
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