解开死亡率的自上而下的驱动因素,这些驱动因素是北太平洋亚热带旋流中Prochlorococcus的底层菌种群动态
Stephen J Beckett1,2, David Demory3,4, Ashley R Coenen5
1School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA. beckett@umd.edu.
Nature communications
|March 7, 2024
概括
食者,而不是病毒,主要控制北太平洋亚热带旋流中的Prochlorococcus种群. 这项研究揭示了自上而下的因素如何维持稳定的海洋微生物群落,尽管每天的生产和损失周期.
科学领域:
- 海洋微生物生态学
- 海洋学初级生产的海洋学初级生产
- 食物网的动态 食物网的动态
背景情况:
- 光合作用驱动海洋初级生产,形成食物网的基础.
- 表面海洋生态系统在日常初级生产和损失之间呈现出紧密的合.
- 维持稳定的皮科西亚诺细菌种群的主要上下驱动因素尚不清楚.
研究的目的:
- 调查控制菌菌种群的自下而上和自上而下机制.
- 了解在北太平洋亚热带旋转 (NPSG) 中维持稳定的微生物种群的因素.
主要方法:
- 利用来自NPSG的高频地表水测量.
- 开发了结合光合作用生长和病毒和牧草动物死亡率的多性模型.
- 对生命史特征和自上而下的控制进行了敏感性分析.
主要成果:
- 纳入光合作用生长和病毒/捕食者诱导死亡率的模型准确地回顾了每日Prochlorococcus种群振荡.
- 捕食者被确定为主要的自上而下的因素,尽管病毒颗粒密度高.
- 依赖光的病毒特征和非正规因素与细胞损失有关.
结论:
- 草在NPSG中的Prochlorococcus种群的调节中发挥着至关重要的作用.
- 上下控制机制,特别是放牧,对于稳定的海洋微生物群落至关重要.
- 生命历史特征的变化可以显著改变不同海洋环境中自上而下的控制的重要性.
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