在澳大利亚的干入侵期间,当地适应的基因组特征的空间变化
Marc A Beer1, Daryl R Trumbo2, Rhett M Rautsaw1,3
1School of Biological Sciences, Washington State University, Pullman, Washington, USA.
Molecular ecology
|July 12, 2024
概括
适应性进化有助于物种范围的扩大,但基因流动可能会阻碍本地适应. 在澳大利亚的甘青中,由于基因流量较高,快速扩张的前沿显示出较少的本地适应性,而不是已建立的区域.
科学领域:
- 生态学和进化生物学
- 基因组学就是基因组学.
- 侵入性物种 生物学 生物学
背景情况:
- 适应性进化对于物种在不同的环境中扩大其范围至关重要.
- 连续创始人效应和在范围扩张期间增加的基因流动可能会阻碍本地适应.
- 在澳大利亚的 (Rhinella marina) 侵袭提供了一个模型系统来研究这些进化动态.
研究的目的:
- 为了调查遗传漂移,基因流动和选在虫对澳大利亚的入侵期间的相互作用.
- 为了测试扩张前线的高基因流是否限制了与已建立区域相比的本地适应.
- 了解不同的入侵历史如何影响进化力量.
主要方法:
- 从扩张前线和已确定的范围区域的澳大利亚甘青收集了减少代表性基因组数据.
- 基因分析评估了在研究地点的等位基因丰富性,异构性和近亲繁殖.
- 用地理加权回归估计了基因环境关联 (GEA),并考虑了等位基因冲浪.
主要成果:
- 确定了三个不同的遗传集群,在所有采样区域都有类似的遗传多样性指标.
- 扩张前线显示,与已建立的地区相比,GEA的斜率明显较低,这表明当地适应能力降低.
- 在采样时,更高的基因流量或最近在扩张前线的殖民可能会限制本地适应.
结论:
- 侵入性物种可以在引入后适应,但进化力量的强度因入侵历史和地理位置而异.
- 快速入侵的最前沿的高基因流可以限制本地适应,即使发生了适应性进化.
- 这项研究为塑造跨异质景观入侵物种进化轨迹的复杂相互作用提供了新的见解.
相关概念视频
Gene Flow
35.0K
Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
35.0K
Genetics of Speciation
19.2K
Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
19.2K
Mutation, Gene Flow, and Genetic Drift
58.3K
In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
58.3K
Genetic Drift
39.7K
Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.
39.7K
The Evidence for Evolution
42.6K
Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
42.6K
Formation of Species
39.2K
Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.
39.2K


