Ecology of diatom DNA and RNA viruses in marine environments

自首次发现硅藻感染病毒以来，病毒感染被认为是影响硅藻动态的重要因素。最近分离并鉴定了两种硅藻病毒CtenDNAV和CtenRNAV，这两种病毒具有相同的寄主物种——细毛毛藻（Chaetoceros tenuissimus）。我们评估了水温与病毒感染之间的关系。结果表明，在较高的水温下，CtenRNAV对寄主种群的影响更快，反之亦然。不同菌株间寄主对CtenRNAV的敏感性存在差异，且随水温变化而变化，但对CtenRNAV不敏感。这些病毒的增殖特征，包括对水温的依赖性，可能是影响硅藻与病毒关系的重要因素，从而导致它们在自然界中的优势和生存。

Since the first discovery of a diatom-infecting virus, viral infection is assumed to be a significant factor affecting the dynamics of diatoms. Recently, two diatom viruses, CtenDNAV and CtenRNAV, which share the same host species, Chaetoceros tenuissimus, were isolated and characterised. We evaluated the relationships between water temperature and viral infections. The results showed that the host population decline due to CtenDNAV was faster at higher water temperatures, and vice versa for CtenRNAV. The susceptibilities of the host species to CtenRNAV were diverse among the strains, and they changed along with water temperature, but not for CtenDNAV. These virus proliferation characteristics, including dependency on water temperature, might be important factors affecting the diatom hos and virus relationship, resulting in both their dominance and survival in nature.