同属南极的 Notothenioid 鱼 Notothenia coriiceps 和 Notothenia rossii 之间的杂交障碍

IF 1.5 4区 环境科学与生态学 Q3 BIODIVERSITY CONSERVATION
Thomas Desvignes, Nathalie R. Le François, Margaret Streeter, Jacob Grondin, Emily Singer, John H. Postlethwait, H. William Detrich
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引用次数: 0

摘要

物种间的杂交和杂交障碍的建立会影响物种的多样化。南极notothenioid鱼类是海洋适应性辐射的一个典型例子,它们在南极洲冰冷的水域中从创新了抗冻糖蛋白的祖先种群中分化而来。然而,南极notothenioid物种的进化过程仍然难以捉摸,种间杂交或品系间杂交障碍的建立可能影响了物种的多样化。为了评估虹彩蝾螈目前的杂交潜力,我们利用牛头虹彩蝾螈(Notothenia coriiceps)的卵母细胞和大理石纹虹彩蝾螈(N. rossii)的精子,在两个同域和同属的虹彩蝾螈物种之间进行了体外受精杂交实验。结果胚胎发育到胃后期/神经早期阶段后突然死亡。对胚胎和亲本进行的遗传分析表明,这些胚胎缺乏可检测到的父系 DNA,因此是雌雄同体的。虽然两个物种之间可能存在交配前障碍,但本实验表明,由于配子不相容,交配后、合子前的生殖障碍很强,阻碍了姐妹物种之间的杂交。我们的研究为这两个具有重要生态意义的同源物种的分化和维持机制提供了新的信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Hybridization barriers between the congeneric antarctic notothenioid fish Notothenia coriiceps and Notothenia rossii

Hybridization barriers between the congeneric antarctic notothenioid fish Notothenia coriiceps and Notothenia rossii

Hybridization between species and the establishment of hybridization barriers can influence the diversification of species. Antarctic notothenioid fishes represent a prime example of marine adaptive radiation that diversified in the icy waters of Antarctica from an ancestral population that innovated antifreeze glycoproteins. The processes by which Antarctic notothenioid species evolved, however, remain elusive, and interspecific hybridization or the establishment of hybridization barriers between lineages may have influenced species diversification. To evaluate the current hybridization potential of notothenioids, we performed an experimental in vitro fertilization cross between two sympatric and congeneric notothen species using oocytes from the bullhead notothen Notothenia coriiceps and sperm from the marbled notothen N. rossii. Resulting embryos developed to late gastrula/early neurula stages and then suddenly died. Genetic analyses of embryos and parents demonstrated that the embryos lacked detectable paternal DNA and were thus gynogenetic. While premating barriers are likely to exist between the two species, this experiment suggests a strong postmating, prezygotic reproductive barrier preventing hybridization between the sister species due to gametic incompatibility in this directional cross. Our study provides novel information on mechanisms that may have contributed to the divergence and maintenance of these two ecologically important congeneric species.

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来源期刊
Polar Biology
Polar Biology 生物-生态学
CiteScore
3.60
自引率
11.80%
发文量
116
审稿时长
3-8 weeks
期刊介绍: Polar Biology publishes Original Papers, Reviews, and Short Notes and is the focal point for biologists working in polar regions. It is also of interest to scientists working in biology in general, ecology and physiology, as well as in oceanography and climatology related to polar life. Polar Biology presents results of studies in plants, animals, and micro-organisms of marine, limnic and terrestrial habitats in polar and subpolar regions of both hemispheres. Taxonomy/ Biogeography Life History Spatio-temporal Patterns in Abundance and Diversity Ecological Interactions Trophic Ecology Ecophysiology/ Biochemistry of Adaptation Biogeochemical Pathways and Cycles Ecological Models Human Impact/ Climate Change/ Conservation
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