亚生时代的浮游生物进化在亚生时代的非生物强迫
Daniela N Schmidt1, Hans R Thierstein, Jörg Bollmann
1Department of Earth Sciences, Eidgenössische Technische Hochschule (ETH) Zürich, and University of Zürich, ETH-Zentrum, CH-8092 Zürich, Switzerland. d.schmidt@gl.rhul.ac.uk
概括
浮游生物菌体的测试尺寸在中生代期间增加,适应了更强的海洋分层. 这种全球冷却趋势影响了浮游生物的进化和海洋生态系统.
科学领域:
- 古海洋学是古海洋学.
- 微观古生物学的古生物学
- 进化生物学 进化生物学
背景情况:
- 浮游生物 (planktic foraminifera) 是具有可化石化外 (试验) 的关键海洋浮游生物.
- 它们的进化历史提供了对过去海洋状况的洞察.
- 了解驱动它们宏观进化的因素对于古气候重建至关重要.
研究的目的:
- 通过Cenozoic来描述浮游生物的进化辐射.
- 为了研究浮游生物类动物的测试尺寸和环境参数之间的关系.
- 为了确定在应对古海洋学变化时增加试验尺寸的适应意义.
主要方法:
- 分析了500多个中纪海洋沉积物样本的测试尺寸分布.
- 检查了100多万个单独的类动物测试.
- 用环境数据对Holocene大小模式进行校准,并与Cenozoic paleoproxy记录进行比较.
主要成果:
- 在浮游生物菌体测试尺寸和地表水分层强度之间发现了一致的正相关性.
- 浮游生物菌体在整个古老时代表现出一个宏观进化趋势,即增加试验尺寸.
- 这种尺寸增加与极地冷却导致的低度地表水分层加剧相关.
结论:
- 观测到的浮游生物菌体测试尺寸的增加代表了对加强海洋分层的适应性反应.
- 与全球极地冷却相关的强化分层,在浮游生物菌的进化中发挥了重要作用.
- 在浮游生物中测试尺寸演变为过去的地表水条件和气候动态的代理.
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