测量微动物浮游生物放牧率的两种常见方法的实验和现场比较
Jennifer L Beatty1, Brittany P Stewart1, Kendra A Turk-Kubo2
1Department of Biological Sciences, University of Southern California, Los Angeles, CA, United States.
Frontiers in microbiology
|December 22, 2025
概括
评估了两种常见的方法来测量微生物放牧的小浮游生物. 两者都低估了实验室测试中的猎物死亡率,稀释技术显示的变异性低于光标记细菌. 现场结果显示,方法之间存在很大的差异.
科学领域:
- 海洋微生物生态学
- 水生食物网的动态
背景情况:
- 微生物真核生物 (microbial eukaryotes) 吃草的是小浮游生物 (picoplankton),这是水生食物网中的一个关键过程,特别是在寡头养区.
- 测量这种放牧的古典田间方法被广泛使用,但在受控条件下缺乏严格的评估.
研究的目的:
- 评估两种常见现场技术的准确性和可靠性:稀释技术和光标记细菌 (FLB) 的消失.
- 将这些方法与实验室培养和实地实地实验中的猎物死亡率的直接观察进行比较.
主要方法:
- 实验室实验使用蓝菌 *Prochlorococcus* 作为猎物和放牧动物 *Paraphysomonas bandaiensis*.
- 在北太平洋亚热带旋流中进行的实地实验.
主要成果:
- 在实验室中,FLB低估了~27%的死亡率,变异性很高;稀释技术低估了~54%但变异性较低.
- 实地实验显示,这两种方法之间的牧草者介导死亡率有数量级的差异.
- 这两种方法都在实验室中提供了合理的,尽管低估的死亡率.
结论:
- 现场结果的差异表明,一种或两种方法的假设可能无法在现场实现.
- 在解释从这些传统方法中得出的数量放牧率时,建议谨慎.
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