慢速生长在鱼干系的起源
Jennifer Botha1, Bailey M Weiss2, Kathleen Dollman3
1Evolutionary Studies Institute, University of the Witwatersrand, Johannesburg 2050, South Africa; GENUS: DSI-NRF Centre of Excellence in Palaeosciences, University of the Witwatersrand, Johannesburg 2050, South Africa.
Current biology : CB
|September 15, 2023
概括
鱼形态动物中缓慢生长的进化,包括早期的鱼形态动物,发生在三纪晚期. 这种增长战略的转变影响了它们在三叠纪末期的大规模灭绝中幸存下来.
科学领域:
- 古生物学的古生物学
- 进化生物学 进化生物学
- 比较解剖学的比较.
背景情况:
- 活着的爬行动物,包括鱼,表现出缓慢的生长和低代谢率.
- 古史学证据表明,祖先的鱼形态动物有更高的生长率.
- 由于化石数据有限,对鱼形态动物进化过渡到缓慢生长的时间尚不清楚.
研究的目的:
- 为了研究鱼形态动物缓慢生长的进化起源.
- 为了确定何时在鱼形状的血统中发生过渡到缓慢的骨沉积.
- 评估不同生长策略对早期伪和鱼形态动物的生态和生存影响.
主要方法:
- 从早期鱼形态动物和其他伪动物的多样样样本中分析骨质组织学数据.
- 遗传学上下文化古史学发现.
- 骨组织类型的比较 (编织,平行纤维,片状) 来推断生长速度.
主要成果:
- 过渡到缓慢生长的骨类型发生在三纪晚期的鱼类动物起源的周围.
- 早期分离的伪菌体表现出高的生长率,这可以通过在本体发生过程中织成的骨头来证明.
- 早期的鱼形态动物,包括一个新的大体类别,表现出缓慢的最大骨沉积率,其特征是平行纤维或片状骨.
- 快速生长的伪苏希亚血统在三叠纪期间经历了灭绝,而缓慢生长的鱼形态生物幸存下来.
结论:
- 鱼形态动物的缓慢生长起源于三叠纪晚期,与陆地适应相吻合,而不是静止或水生生活方式.
- 增长战略在特里亚斯纪末期的大规模灭绝中发挥了差异性生存的作用.
- 这项研究突出了在特里亚斯纪末期事件之后,类动物生长策略的不同进化轨迹.
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