Sorbonne Université, CNRS, Laboratoire d'Océanographie Microbienne (LOMIC), Observatoire Océanologique de Banyuls, Banyuls sur Mer, France.
Sorbonne Université, CNRS, Laboratoire d'Ecogéochimie des Environnements Benthiques (LECOB), Observatoire Océanologique de Banyuls, Banyuls sur Mer, France.
Environ Microbiol. 2021 May;23(5):2592-2604. doi: 10.1111/1462-2920.15482. Epub 2021 Apr 7.
Marine picoplankton contribute to global carbon sequestration and nutrient recycling. These processes are directly related to the composition of communities, which in turn depends on microbial interactions and environmental forcing. Under regular seasonal cycles, marine communities show strong predictable patterns of annual re-occurrences, but little is known about the effect of environmental perturbation on their organization. The aim of our study was to investigate the co-occurrence patterns of planktonic picoeukaryote, bacteria and archaea under contrasting environmental conditions. The study was designed to have high sampling frequency that could match both the biological rhythm of marine microbes and the short time scale of extreme weather events. Our results show that microbial networks changed from year to year depending on conditions. In addition, individual taxa became less interconnected and changed neighbours, which revealed an unfaithful relationship between marine microorganisms. This unexpected pattern suggests possible switches between organisms that have similar specific functions, or hints at the presence of organisms that share similar environmental niches without interacting. Despite the observed annual changes, the time series showed re-occurring communities that appear to recover from perturbations. Changing co-occurrence patterns between marine microorganisms may allow the long-term stability of ecosystems exposed to contrasting meteorological events.
海洋微微型浮游生物对全球碳固存和营养物质循环至关重要。这些过程与群落的组成直接相关，而群落的组成又取决于微生物的相互作用和环境胁迫。在常规季节性循环下，海洋群落表现出强烈的可预测的年度重现模式，但对于环境扰动对其组织的影响知之甚少。我们的研究旨在调查浮游微微型真核生物、细菌和古菌在对比环境条件下的共存模式。该研究设计了高采样频率，可以与海洋微生物的生物节律和极端天气事件的短时间尺度相匹配。我们的研究结果表明，微生物网络因条件而异而逐年发生变化。此外，个别分类群变得相互联系较少，并且改变了邻居，这揭示了海洋微生物之间不忠实的关系。这种意外的模式表明，可能存在具有相似特定功能的生物之间的转换，或者暗示存在具有相似生态位而不相互作用的生物。尽管观察到了年度变化，但时间序列显示出了从干扰中恢复的重现群落。海洋微生物之间共存模式的变化可能允许暴露于对比气象事件的生态系统保持长期稳定。
