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在珊瑚礁上的宿主特异性病毒掠食网络.

Natascha S Varona1, Poppy J Hesketh-Best1,2, Felipe H Coutinho3

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病毒溶解会影响珊瑚礁细菌,但宿主相互作用尚不清楚. 这项研究揭示了病毒与宿主丰富性脱,识别了海洋生态系统中的高生产率病毒及其宿主.

关键词:
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科学领域:

  • 海洋微生物学 海洋微生物学
  • 病毒生态学 病毒生态学
  • 生物地质化学循环过程

背景情况:

  • 病毒溶解对于控制珊瑚礁中的细菌种群至关重要.
  • 方法上的挑战阻碍了对病毒与宿主相互作用及其频率的理解.

研究的目的:

  • 在珊瑚礁水域重建一个丰富解决的病毒-细菌相互作用网络.
  • 为了识别病毒宿主和量化相互作用频率.
  • 为了研究病毒丰度,病毒产量和宿主丰度之间的关系.

主要方法:

  • 集成的直接显微镜可以通过近距离结合,prophage集成和CRISPR间距器来计算病毒-宿主链接.
  • 重建了一个病毒-细菌相互作用网络,有3013个链接和97个独特的物种级相互作用.
  • 分析了与细胞相关的病毒与宿主比率 (VHR) 作为病毒生产的指标.

主要成果:

  • 病毒颗粒的丰富性与宿主丰富性和病毒产生的关系很弱.
  • 高生产率的病毒 (高VHR) 与中等到低丰度的宿主 (Gammaproteobacteria, Bacteroidia, Planctomycetia) 相互作用.
  • 低产量的病毒与丰富的宿主 (Alphaproteobacteria,Gammaproteobacteria) 相互作用,这些宿主富含了prophages.

结论:

  • 在海洋微生物群落中,病毒的数量和产量是分离的.
  • 不同的衰变速率和爆裂大小可能解释了这种脱.
  • 溶解性感染对高丰度宿主生态具有重要意义.