已灭绝的波罗的海海种群的进化历史
Maiken Hemme Bro-Jørgensen1,2, Hans Ahlgren1, Aikaterini Glykou1
1Archaeological Research Laboratory, Department of Archaeology and Classical Studies Stockholm University Stockholm Sweden.
Ecology and evolution
|May 12, 2025
概括
古老的波罗的海海在北极以外形成了一个独特的种群. 它们的灭绝很可能是由于环境变化和人类狩猎导致的遗传多样性丧失造成的.
科学领域:
- 古遗传学 古遗传学
- 海洋哺乳动物的进化
- 古代DNA分析 古代DNA分析
背景情况:
- 一种灭绝的海 (Pagophilus groenlandicus) 种群居住在波罗的海中石器时代到铁器时代,位于当代北极地区之外.
- 这种群体表现出不寻常的迁徙行为,体型减小和人口波动,导致其灭绝.
- 这种独特的波罗的海海种群的进化历史,起源和灭绝原因尚不清楚.
研究的目的:
- 通过使用古代DNA,研究波罗的海海种群的进化历史.
- 为了确定这个群体的起源,殖民时间,遗传多样性和灭绝因素.
- 为了比较古代的波罗的海海与当代的北极种群.
主要方法:
- 49个古老的波罗的海和8个古老的北极海基因组的生成.
- 对古代线粒体组与53个当代北极海线粒体组进行分析.
- 遗传地理分析以评估遗传差异化和基因流动.
主要成果:
- 有限的植物地理分辨率表明,从一个常见的避难人口扩大了普莱斯托时代晚期的范围,随后发生了基因流动.
- 古老的波罗的海海在遗传上与当代种群不同,并随着时间的推移保持了它们独特的遗传构成.
- 波罗的海海的遗传多样性随着时间的推移而减少,但仍然与当代种群相比,表明它是一个独特的,孤立的繁殖种群.
结论:
- 波罗的海海构成了基因上独特的种群,可能偶尔会接收来自北极的移民,但主要局限于波罗的海.
- 灭绝的假设原因包括由人口波动驱动的遗传多样性丧失.
- 环境因素 (气候变化,盐度降低,生产力变化) 和强烈的人类捕捞可能导致了该种群的灭绝.
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