昆虫染色体反转热适应的新发现亚种果蝇的美洲种群

IF 0.7 4区 农林科学 Q4 ENTOMOLOGY Entomological Science Pub Date : 2024-07-30 DOI:10.1111/ens.12582
Concepció Arenas, Goran Zivanovic, Cinta Pegueroles, Francesc Mestres
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引用次数: 0

摘要

亚种果蝇具有丰富的倒位染色体多态性,是测试热适应遗传变异的极佳模式物种。在古北区种群中,该物种的倒位染色体可分为 "冷"、"暖 "或 "非热 "适应型。根据这种分类方法,开发出了染色体热指数(CTI),它可以测量种群的热适应性并监测随时间的变化。在此,我们首次将该指数用于亚种仓鼠(D. subobscura)的美洲定殖种群,以获得有关该物种热适应性的新信息。因此,我们定义了美洲大陆的热适应倒位("冷 "和 "暖"),并计算了南美洲(1981 年和 1999 年样本)和北美洲(1985 年和 2004 年样本)亚盘尾蜥种群的 CTI。总体而言,这两个美洲种群的 CTI 值与纬度呈反比关系,纬度越高,CTI 值越低。在比较不同年份采样的种群时,南美洲(1981 年和 1999 年)六次时间比较中有四次检测到 CTI 值增加(只有一次是显著的),北美洲(1985 年和 2004 年)七次时间比较中有六次检测到 CTI 值增加。对美洲两个半球的 CTI 值进行的单向重复测量 anova 全球分析表明,智利和北美洲的 "暖 "适应反常现象呈上升趋势,但这种上升只在北美洲显著。总体而言,这些结果与全球变暖的预期一致,尽管自然选择在殖民地半球的作用不同。
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New insights on the chromosomal inversion thermal adaptation in insects: American populations of Drosophila subobscura

Drosophila subobscura is an excellent model species for testing genetic variation in thermal adaptation due to its rich inversion chromosomal polymorphism. In Palearctic populations, the inversions of this species can be classified as “cold”, “warm” or “nonthermal” adapted. Based on this classification the Chromosomal Thermal Index (CTI) was developed, which allows measuring the thermal adaptation of populations and monitoring changes over time. Here, we aim to use this index in American colonizing populations of D. subobscura for the first time to obtain new information on the species thermal adaptation. Thus, thermal adapted inversions (“cold” and “warm”) were defined for the American continent and CTI was computed in South American (1981 and 1999 samples) and North American (1985 and 2004 samples) populations of D. subobscura. In general, both American populations showed an inverse relationship between CTI values and latitude, with CTI values decreasing when latitude increases. When comparing populations sampled in different years, an increase in CTI values was detected in four out of six temporal comparisons (only one was significant) of South America (1981 and 1999) and in six out of seven populations of North America (1985 and 2004). A global analysis using a one-way repeated measures anova of CTI values in both American hemispheres showed a trend of increase for “warm” adapted inversions in Chile and North America, but this increase was only significant for the latter. Overall, these results are in agreement with global warming expectations, although natural selection acted differently in the colonized hemispheres.

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来源期刊
Entomological Science
Entomological Science 生物-昆虫学
CiteScore
2.00
自引率
11.10%
发文量
30
审稿时长
6-12 weeks
期刊介绍: Entomological Science is the official English language journal of the Entomological Society of Japan. The Journal publishes original research papers and reviews from any entomological discipline or from directly allied field in ecology, behavioral biology, physiology, biochemistry, development, genetics, systematics, morphology, evolution and general entomology. Papers of applied entomology will be considered for publication if they significantly advance in the field of entomological science in the opinion of the Editors and Editorial Board.
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