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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.
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The diverse plant life on Earth—consisting of nearly 400,000 species—can be divided into three broad categories based on biological characteristics: nonvascular, seedless vascular, and seed plants.
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Organisms must balance energy intake with the energy required for growth, maintenance and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species, like annual plants, have only one reproductive episode in their lifetimes and consequently have short lifespans. Iteroparous species, by contrast, have many reproductive events during their lifetimes but have relatively few offspring. These two...
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Plants often form mutualistic relationships with soil-dwelling fungi or bacteria to enhance their roots’ nutrient uptake ability. Root-colonizing fungi (e.g., mycorrhizae) increase a plant’s root surface area, which promotes nutrient absorption. While root-colonizing, nitrogen-fixing bacteria (e.g., rhizobia) convert atmospheric nitrogen (N2) into ammonia (NH3), making nitrogen available to plants for various biological functions. For example, nitrogen is essential for the...
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春季季节性辐射 短暂的短暂物质

Soichi Osozawa1, Cunio Nackejima2

  • 1Institute of Geology and Paleontology, Faculty of Science Tohoku University Sendai Japan.

Plant-environment interactions (Hoboken, N.J.)
|January 27, 2025
PubMed
概括

东亚春季短暂物种在约155万年前通过适应性辐射多样化,这是由环境变化所驱动的. 这与替代性形成鲜明对比,突出了对地质事件的进化反应.

科学领域:

  • 生态学和进化生物学.
  • 遗传学和分子进化研究
  • 古地质学和四分期地质学

背景情况:

  • 东亚春季短暂生物居住在独特的生态系统中,它们的出现在历史上归因于四季地质事件的代.
  • 日本北部的森林,包括Fagus crenata和Quercus crispula,拥有各种春季短暂植物,如Erythronium japonicum和Asarum属.
  • 了解这些物种的进化驱动因素对于理解东亚生物多样性模式至关重要.

研究的目的:

  • 研究东亚春季短暂物种的遗传学关系和多样化时间,重点关注Asarum属.
  • 为了确定代理或适应性辐射是否最能解释这些物种的进化历史.
  • 与古地理变化相关联的物种化事件,特别是东中国海的形成.

主要方法:

  • 用PopART (版本1.7) 的哈普罗型网络构造进行了家族遗传学分析.
  • 分子约会使用BEAST (v1.10.4) 进行,其中包括四年纪地质事件 (1.55 ± 0.15 Ma) 和四年纪前化石校准.
  • 进行了物种分布和适应 (例如,对大雪) 的比较分析.

主要成果:

  • 遗传学分析表明,在四季纪期间,大约155万年前,春季短暂生物的同时分裂和多样化事件发生了.
  • 适应性辐射被认为是差异化的主要驱动因素,得到了部分对称分布和岛屿发生的支持.
关键词:
亚萨鲁姆 (Asarum) 是一个令人惊叹的城市.野兽v1.10.4 的时间在 PopART 1.7 版本中.维奥拉 维奥拉 维奥拉适应性辐射适应性的辐射气候变化 气候变化春季短暂的东西 春天的短暂的东西维卡里安斯 (维卡里安斯) 是一个牧师.

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  • 像Asarum megacalyx和Fagus crenata这样的物种表现出适应大雪的适应,与辐射相一致,以应对环境变化.

    • 结论:

    • 东亚春季短暂物种的多样化更可能归因于适应性辐射,由与东中国海形成相关的环境变化引发.
    • 这种进化模式与北美和欧洲春季短暂物种中观察到的多样化相似,这些短暂物种对四季气候变化做出了反应.
    • 这项研究强调了地质和气候事件在塑造东亚植物进化轨迹中的作用.