分歧和连续殖民形成了遗传变异,并定义了亚洲大象的保护单位
Anubhab Khan1, Maitreya Sil2, Tarsh Thekaekara3
1National Centre for Biological Sciences, TIFR, GKVK campus, Bangalore 560065, India; School of Biodiversity, One Health and Veterinary Medicine, University of Glasgow, Glasgow G128QQ, UK.
Current biology : CB
|September 28, 2024
概括
亚洲大象 (Elephas maximus) 的遗传多样性从印度北部到南部都在下降,南部种群的近亲繁殖和遗传负荷较高. 这些发现突出了对脆弱的大象种群的关键保护需求.
科学领域:
- 基因组学就是基因组学.
- 保护生物学 保护生物学
- 人口遗传学 人口遗传学
背景情况:
- 亚洲大象 (Elephas maximus) 在生态和文化上是亚洲重要的大草食动物.
- 他们的人口遗传结构,多样性和印度的人口统计历史都未得到充分研究.
- 了解这些因素对于有效的管理和保护战略至关重要.
研究的目的:
- 利用全基因组数据分析印度各地亚洲大象的种群遗传结构和多样性.
- 调查人口史,并确定不同的管理/保护单位.
- 评估不同大象种群的遗传负荷及其对保护的影响.
主要方法:
- 来自印度多元景观的34头亚洲大象的全基因组测序.
- 对遗传多样性,近亲繁殖 (FROH),有效种群大小和遗传负荷的分析.
- 人口结构和管理/保护单位的识别.
主要成果:
- 确定了五个管理/保护单位:北部,中部和三个印度南部的人口.
- 遗传多样性从北向南下降,北方的人口呈现出更高的多样性和更低的近亲繁殖.
- 南方种群的多样性较低,近亲繁殖率很高,还有有害的等位基因清除的证据,其余负载是同卵性.
结论:
- 北方大象种群在遗传上更为多样化,与南方大象相比,内生较少.
- 最南端的种群由于遗传多样性较低和有害等位基因的高同性,面临着高度的保护优先级.
- 连续创建事件的基因组签名与这个危物种的遗传多样性和负载模式相关.
相关概念视频
Limits to Natural Selection
31.2K
Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
31.2K
Convergent Evolution
27.6K
Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
27.6K
Genetic Drift
39.5K
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.
39.5K
Mutation, Gene Flow, and Genetic Drift
58.2K
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).
58.2K
Migration
7.9K
Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
7.9K
Conservation of Small Populations
13.1K
Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
13.1K


