海洋浮游病毒是水体微生物群落中丰度最高的成员，分布广泛。在海洋生态系统中，病毒可以裂解细菌，可能导致10-50%细菌的死亡，同时病毒感染宿主细菌的过程主要依靠接触几率的大小，所以水域的富营养化大大提高了病毒感染细菌的几率，且病毒通过对细菌丰度的裂解可以减少细菌的生态功能，因此病毒在富营养化水域中对细菌的生态功能起着重要的控制作用。且基于在海洋环境中细菌对溶解氧的消耗过程起着主导作用，所以本项目拟研究1）细菌功能（如呼吸速率，生产力等）受病毒影响的细菌种间差异；2）富营养化条件下，病毒裂解细菌的过程对环境所产生的生态作用；3）自然水体在富营养化条件下，病毒对细菌生态功能影响和调节作用，为揭示病毒对细菌群落的控制作用及对水域富营养化过程中溶解氧消耗所起的作用提供理论基础。

Free-living viruses are abundant and widespread in aquatic environments. Viruses are responsible for about 10-50% of total bacterial mortality and play an important role in marine ecosystems. The viral infection rate is mainly dependent on host-virus contact rate. Anthropogenic influenced eutrophic waters will greatly increase the contact rate of virus infection of bacteria. Viruses can slow down bacterial consumption of oxygen and reduce bacteria-induced eutrophication effects in anthropogenic eutrophic waters. Therefore, it is important to understand the role of virus-bacteria interactions in anthropogenic eutrophic waters and could affect consumption of dissolved oxygen in marine ecosystems. Our proposed objectives are 1) to study the viral effects on different single bacterial strain – the bacterial species differences; 2) investigate the process of the viral effects on bacterial functions under eutrophic waters; 3) to examine the viral effects on bacterial community in natural eutrophic waters.