Related Experiment Video
Updated: Jul 18, 2025
10:43
Unraveling the Unseen Players in the Ocean - A Field Guide to Water Chemistry and Marine Microbiology
Published on: November 5, 2014
25.7K
Virus-Host Interactions Drive Contrasting Bacterial Diel Dynamics in the Ocean
Xiaowei Chen1, Chen Hu1,2, Wei Wei1,3
1State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Fujian Key Laboratory of Marine Carbon Sequestration, Xiamen University, Xiamen 361102, PR China.
Research (Washington, D.C.)
|August 24, 2023
Summary
Marine viruses exhibit daily cycles in production and decay, influencing bacterial communities. These viral dynamics impact bacterial diversity and composition, highlighting their crucial role in ocean ecosystems.
Area of Science:
- Marine microbiology
- Viral ecology
- Ocean biogeochemistry
Background:
- Diel rhythmicity is common in marine organisms, influenced by light, energy, and microbial interactions.
- Planktonic diel dynamics involve photoautotrophs and heterotrophic bacterioplankton.
- Understanding viral production and decay is key to marine microbial ecology.
Purpose of the Study:
- To investigate diel fluctuations of viral production and decay in the South China Sea.
- To assess the impact of viral dynamics on bacterial communities (total and active).
- To explore habitat-specific and depth-dependent virus-host interactions.
Main Methods:
- Sampling of coastal and open seawaters in the South China Sea.
- Analysis of viral production and decay rates over diel cycles.
- Assessment of bacterial community composition, activity, and diversity.
- Correlation analysis between viral dynamics and bacterial community parameters.
Main Results:
- A diel pattern of night-time lytic viral production and lower viral decay was observed, leading to viral accumulation.
- Bacterial activity, community composition, and diversity were significantly affected by viral dynamics.
- Bacterial diversity showed a positive correlation with lytic viral production in the open ocean euphotic zone.
- Bacterial diversity was negatively correlated with lysogenic viral production in the coastal ocean.
Conclusions:
- Viral life strategies significantly influence bacterial community diversity and composition.
- Viruses play a critical role in shaping bacterial communities, potentially dominating through host interactions.
- Virus-host interactions exhibit synchronized, depth-dependent, and habitat-specific diel patterns.
- Viruses are crucial drivers of bacterial diel dynamics and biogeochemical processes in the ocean.
More Related Videos
Related Concept Videos
01:10Intracellular Movement of Viruses and Bacteria
2.9K
Intracellular bacteria and viruses often comprise a group of highly infectious pathogens that can cause several diseases. Bacterial pathogens include those belonging to the genus Rickettsia responsible for conditions such as rocky mountain spotted fever and the Mediterranean spotted fever; Chlamydia, a genus responsible for a sexually transmitted disease; Coxiella burnetii, an agent responsible for Q fever. Viral pathogens include vaccinia—a poxvirus, and herpes simplex virus—a...
2.9K
01:29Viruses of Archaea
30
Archaeal viruses play a crucial role in the ecosystems of extremophilic archaea, particularly those belonging to the phyla Euryarchaeota and Crenarchaeota. By shaping host evolution and facilitating gene transfer, these viruses influence microbial communities and contribute to genetic diversity in extreme environments. The archaea they infect thrive in acidic hot springs and hydrothermal vents characterized by high temperatures and low pH. Archaeal viruses exhibit remarkable structural...
30
01:16Viral Replication: Lysogenic Cycle
51
The lysogenic cycle is a crucial viral replication strategy that allows bacteriophages to persist within host cells without immediately destroying them. This process is primarily observed in temperate phages, such as bacteriophage lambda (λ), which infects Escherichia coli. The cycle allows the viral genome to persist across bacterial generations while keeping host cells viable.Integration of the Viral GenomeUpon infection, bacteriophage lambda attaches to the bacterial surface and injects...
51
01:20Viral Replication: Lytic Cycle
52
Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...
52
01:30Lytic Cycle of Bacteriophages
70.9K
Bacteriophages, also known as phages, are specialized viruses that infect bacteria. A key characteristic of phages is their distinctive “head-tail” morphology. A phage begins the infection process (i.e., lytic cycle) by attaching to the outside of a bacterial cell. Attachment is accomplished via proteins in the phage tail that bind to specific receptor proteins on the outer surface of the bacterium. The tail injects the phage’s DNA genome into the bacterial cytoplasm. In the...
70.9K
00:43Lysogenic Cycle of Bacteriophages
62.3K
In contrast to the lytic cycle, phages infecting bacteria via the lysogenic cycle do not immediately kill their host cell. Instead, they combine their genome with the host genome, allowing the bacteria to replicate the phage DNA along with the bacterial genome. The incorporated copy of the phage genome is called the prophage. Some prophages can re-activate and enter the lytic cycle. This often occurs in response to a perturbation, such as DNA damage, but can also transpire in the absence of...
62.3K